洪水シーズン — 世界の月ごとのガイド

ほぼ毎年、川の水が街にあふれます。

これはおすすめではなく、注意喚起のページです。SeasonMapで洪水シーズンの対象になる旅行先は112か所。以下はリスクのある期間にあたる月です — その大半の週は何事もなく過ぎ、各場所の横のスコアは、要注意シーズンも含めた通常の気候スコアです。

← すべての季節世界のカレンダー

見られる時期

その月に洪水シーズンが見られる旅行先の数です。時期は毎年少しずつずれます。

1月の洪水シーズン

  1. フジャイラ市 🇦🇪 アラブ首長国連邦Winter rain and wadi floods · 12月1日〜3月31日（例年）This is the wettest corner of the Emirates, and a day of rain on the Hajar mountains sends water down the wadis fast enough to cut the roads.92
  2. ダハブ 🇪🇬 エジプトSinai flash floods · 10月15日〜3月15日（例年）Rare and violent: a storm over the mountains sends water down the wadis and across the coast road, cutting the runs to Nuweiba and St Catherine for a day.91
  3. メッカ 🇸🇦 サウジアラビアWinter flash floods · 11月1日〜1月31日（例年）The valley takes most of its rain in a handful of storms and the runoff comes off bare rock into the streets, shutting underpasses and approach roads for a few hours.90
  4. アカバ 🇯🇴 ヨルダンWadi flash-flood season · 10月15日〜3月31日（例年）Rain over the mountains behind town runs off bare rock and crosses the roads out to Wadi Rum and the Dead Sea.90
  5. カファジャーテ・デパルタメント 🇦🇷 アルゼンチンSummer storm road closures · 12月15日〜3月15日（例年）The valley's rain arrives as short violent summer storms and the Quebrada de las Conchas road towards Salta closes for rockfall and washed-out crossings.87
  6. トルヒーリョ 🇵🇪 ペルーRain floods from the ravines · 1月15日〜4月15日（例年）In most years the coast stays dry, but warm-sea years bring heavy rains that activate the dry ravines above the city.85
  7. アレクサンドリア 🇪🇬 エジプトWinter storms off the sea · 11月15日〜3月15日（例年）Named storms come in off the Mediterranean every few weeks and the drains give up before the rain does: flooded underpasses, closed corniche lanes, a day written off.84
  8. 死海 🇯🇴 ヨルダンWadi flash-flood season · 11月1日〜3月31日Rain falling on the highlands drains into the canyons that come down to the shore, and the valley road and every side wadi close at short notice.84
  9. イカ 🇵🇪 ペルーHighland rains and huaicos · 1月15日〜3月31日（例年）Rain in the Andes sends mudflows and river surges down into the desert valleys; in bad years the Ica, Ocucaje and Nazca areas flood and the Panamericana Sur is cut for hours.81
  10. ペトラ 🇯🇴 ヨルダンFlash-flood closures · 11月1日〜3月31日The Siq is a drain for a wide catchment, and after heavy rain on the plateau the authority evacuates the site with little warning.79
  11. ワディ・ラム 🇯🇴 ヨルダンFlash floods in the wadis · 11月1日〜3月31日（例年）Rain on the plateau runs off bare rock and fills the wadis within minutes, and the desert tracks and the road in can both be cut for a day.76
  12. ハボローネ 🇧🇼 ボツワナSummer flash floods · 12月1日〜3月15日（例年）Intense summer storms can overwhelm the city's drainage; the February 2025 floods killed people in Gaborone and closed roads, bridges and schools.75
  13. バグダード 🇮🇶 イラクStreet flooding in the first rains · 10月25日〜1月31日（例年）The season's first heavy downpours regularly overwhelm Baghdad's drainage and pumping stations: underpasses and main roads flood, traffic seizes up and some districts sit in water for a day or more.74
  14. ハラレ 🇿🇼 ジンバブエFlash floods in the heavy rains · 12月1日〜3月15日（例年）Afternoon storms at the height of the rains overwhelm drains in the city centre and low-lying suburbs such as Mbare, Glen View and Budiriro.70
  15. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.69
  16. コインブラ 🇵🇹 ポルトガルMondego river floods · 12月15日〜3月15日（例年）In wet winters the Mondego tops its banks: the riverside cafes of Parque Verde and the grounds of Santa Clara-a-Velha go under, and in the worst storms low-lying Baixa streets and schools close.66
  17. ブラザヴィル 🇨🇬 コンゴ共和国Congo River flood season · 11月15日〜1月31日（例年）The river runs highest at the end of the year while storms overwhelm the drains, so low-lying districts such as Talangai and Mfilou can flood and roads get cut.65
  18. サンパウロ 🇧🇷 ブラジルSummer storms and flooding · 12月1日〜3月31日（例年）Late-afternoon storms most days through the southern summer, and the ones that stall put the Tiete and the marginais under water and the traffic at a standstill for hours.63
  19. サルタ 🇦🇷 アルゼンチンSummer rain closes the mountain roads · 12月15日〜3月15日（例年）Storms in the southern summer send debris over the Cuesta del Obispo and the road down to Cafayate, and either can shut for a day.62
  20. ルサカ 🇿🇲 ザンビアRainy-season flooding · 12月1日〜3月31日（例年）Poor drainage and dense informal settlements mean heavy rains regularly submerge roads and low-lying suburbs each rainy season.60
  21. マチュ・ピチュ 🇵🇪 ペルーLandslides on the rail line · 1月1日〜3月31日（例年）The Urubamba runs high through the wet months and a huaico takes out a stretch of track most years, usually towards Hidroelectrica.60
  22. ヴェネツィア 🇮🇹 イタリアAcqua alta season · 10月1日〜1月15日（例年）High water comes with the autumn tides.59
  23. コンガリー国立公園 🇺🇸 アメリカ合衆国Floodwater on the boardwalk · 12月1日〜4月30日（例年）The floodplain takes water about ten times a year, most often in the wet half, and a rise puts the backcountry trails and parts of the boardwalk underwater.59
  24. マジュロ 🇲🇭 マーシャル諸島King tides wash the road · 12月15日〜3月15日（例年）The atoll is a few hundred metres wide in places with the lagoon on one side and the ocean on the other.57
  25. タラワ 🇰🇮 キリバスKing tides over the causeways · 1月15日〜3月20日（例年）South Tarawa is a thin line of islets joined by causeways, and the highest tides of the year put seawater across the road and into the wells.55

…1月はほか15か所。

1月の世界のイベント →

2月の洪水シーズン

  1. アカバ 🇯🇴 ヨルダンWadi flash-flood season · 10月15日〜3月31日（例年）Rain over the mountains behind town runs off bare rock and crosses the roads out to Wadi Rum and the Dead Sea.96
  2. ダハブ 🇪🇬 エジプトSinai flash floods · 10月15日〜3月15日（例年）Rare and violent: a storm over the mountains sends water down the wadis and across the coast road, cutting the runs to Nuweiba and St Catherine for a day.95
  3. 死海 🇯🇴 ヨルダンWadi flash-flood season · 11月1日〜3月31日Rain falling on the highlands drains into the canyons that come down to the shore, and the valley road and every side wadi close at short notice.90
  4. アレクサンドリア 🇪🇬 エジプトWinter storms off the sea · 11月15日〜3月15日（例年）Named storms come in off the Mediterranean every few weeks and the drains give up before the rain does: flooded underpasses, closed corniche lanes, a day written off.89
  5. カファジャーテ・デパルタメント 🇦🇷 アルゼンチンSummer storm road closures · 12月15日〜3月15日（例年）The valley's rain arrives as short violent summer storms and the Quebrada de las Conchas road towards Salta closes for rockfall and washed-out crossings.89
  6. フジャイラ市 🇦🇪 アラブ首長国連邦Winter rain and wadi floods · 12月1日〜3月31日（例年）This is the wettest corner of the Emirates, and a day of rain on the Hajar mountains sends water down the wadis fast enough to cut the roads.89
  7. ペトラ 🇯🇴 ヨルダンFlash-flood closures · 11月1日〜3月31日The Siq is a drain for a wide catchment, and after heavy rain on the plateau the authority evacuates the site with little warning.82
  8. トルヒーリョ 🇵🇪 ペルーRain floods from the ravines · 1月15日〜4月15日（例年）In most years the coast stays dry, but warm-sea years bring heavy rains that activate the dry ravines above the city.80
  9. イカ 🇵🇪 ペルーHighland rains and huaicos · 1月15日〜3月31日（例年）Rain in the Andes sends mudflows and river surges down into the desert valleys; in bad years the Ica, Ocucaje and Nazca areas flood and the Panamericana Sur is cut for hours.79
  10. ワディ・ラム 🇯🇴 ヨルダンFlash floods in the wadis · 11月1日〜3月31日（例年）Rain on the plateau runs off bare rock and fills the wadis within minutes, and the desert tracks and the road in can both be cut for a day.79
  11. ハラレ 🇿🇼 ジンバブエFlash floods in the heavy rains · 12月1日〜3月15日（例年）Afternoon storms at the height of the rains overwhelm drains in the city centre and low-lying suburbs such as Mbare, Glen View and Budiriro.78
  12. ブジュンブラ 🇧🇮 ブルンジLong rains and flooding · 2月1日〜5月31日（例年）The long rains swell the rivers off the hills behind the city and, in wet years, Lake Tanganyika itself, flooding low-lying lakeside districts and the beach strip.75
  13. コインブラ 🇵🇹 ポルトガルMondego river floods · 12月15日〜3月15日（例年）In wet winters the Mondego tops its banks: the riverside cafes of Parque Verde and the grounds of Santa Clara-a-Velha go under, and in the worst storms low-lying Baixa streets and schools close.74
  14. ハボローネ 🇧🇼 ボツワナSummer flash floods · 12月1日〜3月15日（例年）Intense summer storms can overwhelm the city's drainage; the February 2025 floods killed people in Gaborone and closed roads, bridges and schools.73
  15. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.71
  16. ルサカ 🇿🇲 ザンビアRainy-season flooding · 12月1日〜3月31日（例年）Poor drainage and dense informal settlements mean heavy rains regularly submerge roads and low-lying suburbs each rainy season.70
  17. サンパウロ 🇧🇷 ブラジルSummer storms and flooding · 12月1日〜3月31日（例年）Late-afternoon storms most days through the southern summer, and the ones that stall put the Tiete and the marginais under water and the traffic at a standstill for hours.68
  18. サルタ 🇦🇷 アルゼンチンSummer rain closes the mountain roads · 12月15日〜3月15日（例年）Storms in the southern summer send debris over the Cuesta del Obispo and the road down to Cafayate, and either can shut for a day.67
  19. コンガリー国立公園 🇺🇸 アメリカ合衆国Floodwater on the boardwalk · 12月1日〜4月30日（例年）The floodplain takes water about ten times a year, most often in the wet half, and a rise puts the backcountry trails and parts of the boardwalk underwater.66
  20. ブラザヴィル 🇨🇬 コンゴ共和国Storm flooding and gullies · 2月15日〜5月15日（例年）The heaviest downpours of the long rainy season swamp low streets and cut erosion gullies through the northern districts; drainage is undersized, so a single storm can leave roads impassable.63
  21. タラワ 🇰🇮 キリバスKing tides over the causeways · 1月15日〜3月20日（例年）South Tarawa is a thin line of islets joined by causeways, and the highest tides of the year put seawater across the road and into the wells.62
  22. オックスフォード 🇬🇧 イギリスPort Meadow under water · 12月1日〜2月28日（例年）The Thames spreads across Port Meadow most winters and the towpath north of Walton Well goes under.61
  23. マジュロ 🇲🇭 マーシャル諸島King tides wash the road · 12月15日〜3月15日（例年）The atoll is a few hundred metres wide in places with the lagoon on one side and the ocean on the other.60
  24. ヨーク 🇬🇧 イギリスThe Ouse comes up · 11月1日〜2月28日（例年）King's Staith and the riverside pubs flood most winters — the pubs have tide marks on the walls and mop out afterwards.60
  25. マチュ・ピチュ 🇵🇪 ペルーLandslides on the rail line · 1月1日〜3月31日（例年）The Urubamba runs high through the wet months and a huaico takes out a stretch of track most years, usually towards Hidroelectrica.59

…2月はほか15か所。

2月の世界のイベント →

3月の洪水シーズン

  1. 死海 🇯🇴 ヨルダンWadi flash-flood season · 11月1日〜3月31日Rain falling on the highlands drains into the canyons that come down to the shore, and the valley road and every side wadi close at short notice.94
  2. アレクサンドリア 🇪🇬 エジプトWinter storms off the sea · 11月15日〜3月15日（例年）Named storms come in off the Mediterranean every few weeks and the drains give up before the rain does: flooded underpasses, closed corniche lanes, a day written off.93
  3. ダハブ 🇪🇬 エジプトSinai flash floods · 10月15日〜3月15日（例年）Rare and violent: a storm over the mountains sends water down the wadis and across the coast road, cutting the runs to Nuweiba and St Catherine for a day.93
  4. カファジャーテ・デパルタメント 🇦🇷 アルゼンチンSummer storm road closures · 12月15日〜3月15日（例年）The valley's rain arrives as short violent summer storms and the Quebrada de las Conchas road towards Salta closes for rockfall and washed-out crossings.92
  5. ペトラ 🇯🇴 ヨルダンFlash-flood closures · 11月1日〜3月31日The Siq is a drain for a wide catchment, and after heavy rain on the plateau the authority evacuates the site with little warning.88
  6. アカバ 🇯🇴 ヨルダンWadi flash-flood season · 10月15日〜3月31日（例年）Rain over the mountains behind town runs off bare rock and crosses the roads out to Wadi Rum and the Dead Sea.88
  7. ハラレ 🇿🇼 ジンバブエFlash floods in the heavy rains · 12月1日〜3月15日（例年）Afternoon storms at the height of the rains overwhelm drains in the city centre and low-lying suburbs such as Mbare, Glen View and Budiriro.85
  8. ワディ・ラム 🇯🇴 ヨルダンFlash floods in the wadis · 11月1日〜3月31日（例年）Rain on the plateau runs off bare rock and fills the wadis within minutes, and the desert tracks and the road in can both be cut for a day.85
  9. ハボローネ 🇧🇼 ボツワナSummer flash floods · 12月1日〜3月15日（例年）Intense summer storms can overwhelm the city's drainage; the February 2025 floods killed people in Gaborone and closed roads, bridges and schools.84
  10. フジャイラ市 🇦🇪 アラブ首長国連邦Winter rain and wadi floods · 12月1日〜3月31日（例年）This is the wettest corner of the Emirates, and a day of rain on the Hajar mountains sends water down the wadis fast enough to cut the roads.81
  11. イカ 🇵🇪 ペルーHighland rains and huaicos · 1月15日〜3月31日（例年）Rain in the Andes sends mudflows and river surges down into the desert valleys; in bad years the Ica, Ocucaje and Nazca areas flood and the Panamericana Sur is cut for hours.80
  12. ルサカ 🇿🇲 ザンビアRainy-season flooding · 12月1日〜3月31日（例年）Poor drainage and dense informal settlements mean heavy rains regularly submerge roads and low-lying suburbs each rainy season.78
  13. トルヒーリョ 🇵🇪 ペルーRain floods from the ravines · 1月15日〜4月15日（例年）In most years the coast stays dry, but warm-sea years bring heavy rains that activate the dry ravines above the city.77
  14. コインブラ 🇵🇹 ポルトガルMondego river floods · 12月15日〜3月15日（例年）In wet winters the Mondego tops its banks: the riverside cafes of Parque Verde and the grounds of Santa Clara-a-Velha go under, and in the worst storms low-lying Baixa streets and schools close.75
  15. ブダペスト 🇭🇺 ハンガリーDanube high water · 3月1日〜4月30日（例年）Snowmelt upstream pushes the river over the lower quays most springs.74
  16. コンガリー国立公園 🇺🇸 アメリカ合衆国Floodwater on the boardwalk · 12月1日〜4月30日（例年）The floodplain takes water about ten times a year, most often in the wet half, and a rise puts the backcountry trails and parts of the boardwalk underwater.72
  17. ブジュンブラ 🇧🇮 ブルンジLong rains and flooding · 2月1日〜5月31日（例年）The long rains swell the rivers off the hills behind the city and, in wet years, Lake Tanganyika itself, flooding low-lying lakeside districts and the beach strip.72
  18. サンパウロ 🇧🇷 ブラジルSummer storms and flooding · 12月1日〜3月31日（例年）Late-afternoon storms most days through the southern summer, and the ones that stall put the Tiete and the marginais under water and the traffic at a standstill for hours.70
  19. ドレスデン 🇩🇪 ドイツElbe high water · 2月15日〜6月15日（例年）Snowmelt out of the Czech mountains pushes the Elbe up most springs; the riverside paths, the beer gardens and the ferry landings go under first, and the city has flood gauges marked on the old town wall.68
  20. サルタ 🇦🇷 アルゼンチンSummer rain closes the mountain roads · 12月15日〜3月15日（例年）Storms in the southern summer send debris over the Cuesta del Obispo and the road down to Cafayate, and either can shut for a day.68
  21. ウルル 🇦🇺 オーストラリアSummer storms and waterfalls · 12月1日〜3月15日（例年）Thunderstorms come off the desert in the hot months and the rock runs with waterfalls for a few hours, which is the sight nobody plans for.67
  22. ケルン 🇩🇪 ドイツRhine high water · 12月1日〜3月31日（例年）Winter rain and Alpine melt push the Rhine over the riverside paths most years and occasionally into the old town cellars.67
  23. ヴロツワフ 🇵🇱 ポーランドOdra high water · 3月1日〜7月31日（例年）The city is built across a dozen islands and channels, and it has been overwhelmed twice in living memory — 1997 and again in 2024.67
  24. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.67
  25. シンシナティ 🇺🇸 アメリカ合衆国Ohio River flood season · 2月1日〜4月15日（例年）Late winter rain on frozen ground puts the river over its banks most years, and the low riverfront roads and Sawyer Point paths go under first.66

…3月はほか14か所。

3月の世界のイベント →

4月の洪水シーズン

  1. ブダペスト 🇭🇺 ハンガリーDanube high water · 3月1日〜4月30日（例年）Snowmelt upstream pushes the river over the lower quays most springs.88
  2. トルヒーリョ 🇵🇪 ペルーRain floods from the ravines · 1月15日〜4月15日（例年）In most years the coast stays dry, but warm-sea years bring heavy rains that activate the dry ravines above the city.87
  3. セントルイス 🇺🇸 アメリカ合衆国Spring river flooding · 4月1日〜6月30日（例年）Snowmelt and spring rain up two river systems meet here, and the Arch grounds, Laclede's Landing and the riverboat docks go under in the bad years.80
  4. ドレスデン 🇩🇪 ドイツElbe high water · 2月15日〜6月15日（例年）Snowmelt out of the Czech mountains pushes the Elbe up most springs; the riverside paths, the beer gardens and the ferry landings go under first, and the city has flood gauges marked on the old town wall.78
  5. ヴロツワフ 🇵🇱 ポーランドOdra high water · 3月1日〜7月31日（例年）The city is built across a dozen islands and channels, and it has been overwhelmed twice in living memory — 1997 and again in 2024.77
  6. コンガリー国立公園 🇺🇸 アメリカ合衆国Floodwater on the boardwalk · 12月1日〜4月30日（例年）The floodplain takes water about ten times a year, most often in the wet half, and a rise puts the backcountry trails and parts of the boardwalk underwater.76
  7. シンシナティ 🇺🇸 アメリカ合衆国Ohio River flood season · 2月1日〜4月15日（例年）Late winter rain on frozen ground puts the river over its banks most years, and the low riverfront roads and Sawyer Point paths go under first.76
  8. ゲートウェイアーチ国立公園 🇺🇸 アメリカ合衆国Mississippi spring flood · 3月15日〜6月30日（例年）Snowmelt and spring rain from half a continent arrive here, and the cobblestone levee below the Arch goes under most years — sometimes the riverfront path with it.69
  9. ウィニペグ 🇨🇦 カナダRed River flood season · 4月1日〜5月10日（例年）Snowmelt on a flat, north-flowing river backs water up across the valley most springs, and the floodway around the city was dug for exactly this.68
  10. ロメ 🇹🇬 トーゴLong-rains street flooding · 4月1日〜6月30日（例年）The long rains turn streets in Be, Nyekonakpoe, Agoe and other districts into muddy torrents after each downpour because the drains are clogged.66
  11. コトヌー 🇧🇯 ベナンRainy-season flooding · 4月15日〜7月31日（例年）The long rains swamp Cotonou's low-lying districts and neighbouring Abomey-Calavi after heavy downpours, when drains overflow and whole streets sit under water for days.66
  12. ブジュンブラ 🇧🇮 ブルンジLong rains and flooding · 2月1日〜5月31日（例年）The long rains swell the rivers off the hills behind the city and, in wet years, Lake Tanganyika itself, flooding low-lying lakeside districts and the beach strip.65
  13. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.65
  14. プエルト・イグアス 🇦🇷 アルゼンチンGarganta walkway shut in flood · 11月1日〜4月30日（例年）Summer rain upriver can put the Iguazu over the catwalk to the Devil's Throat balcony, and the circuit shuts until the flow drops.64
  15. フォス・ド・イグアス 🇧🇷 ブラジルDevil's Throat walkway shut · 11月1日〜4月30日（例年）When the Iguacu runs above the safe limit the catwalk out to the Devil's Throat closes on both sides, sometimes for days.64
  16. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.60
  17. ブラザヴィル 🇨🇬 コンゴ共和国Storm flooding and gullies · 2月15日〜5月15日（例年）The heaviest downpours of the long rainy season swamp low streets and cut erosion gullies through the northern districts; drainage is undersized, so a single storm can leave roads impassable.58
  18. ベレン 🇧🇷 ブラジルRain and spring-tide flooding · 1月15日〜4月30日（例年）At the height of the Amazonian winter, heavy afternoon rain meeting the highest tides of the year, above all around March, floods low streets near the canals and the waterfront; check tide tables before planning a day around the old town.46
  19. グアヤキル 🇪🇨 エクアドルRainy season street flooding · 1月1日〜4月30日（例年）The coastal winter brings heavy downpours that flood low-lying streets, worst when they coincide with high tides on the Estero Salado.45

4月の世界のイベント →

5月の洪水シーズン

  1. セントルイス 🇺🇸 アメリカ合衆国Spring river flooding · 4月1日〜6月30日（例年）Snowmelt and spring rain up two river systems meet here, and the Arch grounds, Laclede's Landing and the riverboat docks go under in the bad years.87
  2. ドレスデン 🇩🇪 ドイツElbe high water · 2月15日〜6月15日（例年）Snowmelt out of the Czech mountains pushes the Elbe up most springs; the riverside paths, the beer gardens and the ferry landings go under first, and the city has flood gauges marked on the old town wall.85
  3. ヴロツワフ 🇵🇱 ポーランドOdra high water · 3月1日〜7月31日（例年）The city is built across a dozen islands and channels, and it has been overwhelmed twice in living memory — 1997 and again in 2024.85
  4. グアダルーペ山脈国立公園 🇺🇸 アメリカ合衆国Monsoon storms and flash floods · 5月15日〜9月30日（例年）The wet months bring heavy afternoon thunderstorms and flash flooding in the canyons, which is also what breaks the heat of the day.81
  5. ウィニペグ 🇨🇦 カナダRed River flood season · 4月1日〜5月10日（例年）Snowmelt on a flat, north-flowing river backs water up across the valley most springs, and the floodway around the city was dug for exactly this.80
  6. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.77
  7. ブジュンブラ 🇧🇮 ブルンジLong rains and flooding · 2月1日〜5月31日（例年）The long rains swell the rivers off the hills behind the city and, in wet years, Lake Tanganyika itself, flooding low-lying lakeside districts and the beach strip.75
  8. ゲートウェイアーチ国立公園 🇺🇸 アメリカ合衆国Mississippi spring flood · 3月15日〜6月30日（例年）Snowmelt and spring rain from half a continent arrive here, and the cobblestone levee below the Arch goes under most years — sometimes the riverfront path with it.74
  9. サンアントニオ 🇺🇸 アメリカ合衆国Flash flood season · 5月1日〜6月15日（例年）The Hill Country upstream turns rain into wall-of-water floods faster than almost anywhere in the country, and late spring is the worst of it.70
  10. ジュバ 🇸🇸 南スーダンRainy-season road cuts · 5月15日〜10月31日（例年）Juba's own streets stay passable, but the dirt roads beyond turn to deep mud and floodwater, cutting off towns for weeks.68
  11. ブラザヴィル 🇨🇬 コンゴ共和国Storm flooding and gullies · 2月15日〜5月15日（例年）The heaviest downpours of the long rainy season swamp low streets and cut erosion gullies through the northern districts; drainage is undersized, so a single storm can leave roads impassable.67
  12. ロメ 🇹🇬 トーゴLong-rains street flooding · 4月1日〜6月30日（例年）The long rains turn streets in Be, Nyekonakpoe, Agoe and other districts into muddy torrents after each downpour because the drains are clogged.63
  13. コトヌー 🇧🇯 ベナンRainy-season flooding · 4月15日〜7月31日（例年）The long rains swamp Cotonou's low-lying districts and neighbouring Abomey-Calavi after heavy downpours, when drains overflow and whole streets sit under water for days.61
  14. ラゴス 🇳🇬 ナイジェリアFlash-flood season · 5月1日〜7月20日（例年）Downpours in the main rains flood Victoria Island, Lekki, Ikeja and other districts within hours, turning roads into gridlock; allow hours extra for the airport and avoid driving during a storm.57
  15. ケープ・コースト 🇬🇭 ガーナMajor rainy season floods · 5月15日〜7月15日（例年）The heaviest rains of the year fall in May and June; Cape Coast was the worst-hit town in the Central Region floods of June 2026, with drowned roads and collapsed buildings.56
  16. アビジャン 🇨🇮 コートジボワールRainy-season flash floods · 5月15日〜7月15日（例年）The long rains peak around June, and cloudbursts regularly flood low-lying districts, cut roads and trigger deadly landslides on hillside neighbourhoods such as Attecoube and Yopougon.53
  17. 桂林市 🇨🇳 中華人民共和国Li River flood closures · 5月15日〜7月31日（例年）Heavy rain in the flood season, especially around the Dragon Boat Festival and when typhoon remnants arrive, pushes the Li River towards warning level; the maritime authority then halts every cruise and bamboo raft, sometimes for days.53
  18. ヴァンヴィエン 🇱🇦 ラオスFast, muddy Nam Song · 5月15日〜10月15日（例年）In the rains the river runs high, brown and fast; tubing and kayaking get genuinely risky after heavy downpours.52
  19. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.50
  20. バランキージャ 🇨🇴 コロンビアArroyos in the streets · 5月1日〜11月15日（例年）The city drains its downpours down the roads, and within minutes certain streets carry a current that will move a car.49
  21. ジョージタウン 🇬🇾 ガイアナFlooding in the city · 5月1日〜7月31日（例年）Georgetown lies below sea level and drains through canals and kokers that only open at low tide.47
  22. シレット 🇧🇩 バングラデシュFlash-flood season · 5月15日〜9月30日（例年）The Surma and Kushiyara rivers regularly burst their banks between May and September: the 2022 flood submerged most of Sylhet and neighbouring Sunamganj district, shut the airport and railway station, and displaced close to half a million people.46

5月の世界のイベント →

6月の洪水シーズン

  1. ドレスデン 🇩🇪 ドイツElbe high water · 2月15日〜6月15日（例年）Snowmelt out of the Czech mountains pushes the Elbe up most springs; the riverside paths, the beer gardens and the ferry landings go under first, and the city has flood gauges marked on the old town wall.91
  2. ヴロツワフ 🇵🇱 ポーランドOdra high water · 3月1日〜7月31日（例年）The city is built across a dozen islands and channels, and it has been overwhelmed twice in living memory — 1997 and again in 2024.91
  3. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.82
  4. グアダルーペ山脈国立公園 🇺🇸 アメリカ合衆国Monsoon storms and flash floods · 5月15日〜9月30日（例年）The wet months bring heavy afternoon thunderstorms and flash flooding in the canyons, which is also what breaks the heat of the day.78
  5. セントルイス 🇺🇸 アメリカ合衆国Spring river flooding · 4月1日〜6月30日（例年）Snowmelt and spring rain up two river systems meet here, and the Arch grounds, Laclede's Landing and the riverboat docks go under in the bad years.76
  6. サワロ国立公園 🇺🇸 アメリカ合衆国Monsoon season · 6月15日〜9月30日From the middle of June to the end of September the afternoons build storms over the mountains, and the washes and canyons flash-flood fast enough to catch people out.71
  7. ジュバ 🇸🇸 南スーダンRainy-season road cuts · 5月15日〜10月31日（例年）Juba's own streets stay passable, but the dirt roads beyond turn to deep mud and floodwater, cutting off towns for weeks.71
  8. アディスアベバ 🇪🇹 エチオピアKiremt rains flood the roads · 6月20日〜9月15日（例年）The long rains arrive in late June and the first downpours hit drains clogged after months of dust, so streets flood and traffic locks up for hours.70
  9. ゲートウェイアーチ国立公園 🇺🇸 アメリカ合衆国Mississippi spring flood · 3月15日〜6月30日（例年）Snowmelt and spring rain from half a continent arrive here, and the cobblestone levee below the Arch goes under most years — sometimes the riverfront path with it.66
  10. サンアントニオ 🇺🇸 アメリカ合衆国Flash flood season · 5月1日〜6月15日（例年）The Hill Country upstream turns rain into wall-of-water floods faster than almost anywhere in the country, and late spring is the worst of it.61
  11. ロメ 🇹🇬 トーゴLong-rains street flooding · 4月1日〜6月30日（例年）The long rains turn streets in Be, Nyekonakpoe, Agoe and other districts into muddy torrents after each downpour because the drains are clogged.59
  12. プナカ 🇧🇹 ブータンGlacial flood risk on the rivers · 6月1日〜10月15日（例年）The Mo Chhu and Pho Chhu, which meet at the dzong, are fed by glacial lakes upstream that have burst before: floods in 1957, 1960, 1994 and 1996 each damaged Punakha Dzong, the worst killing 23 people.59
  13. ケープ・コースト 🇬🇭 ガーナMajor rainy season floods · 5月15日〜7月15日（例年）The heaviest rains of the year fall in May and June; Cape Coast was the worst-hit town in the Central Region floods of June 2026, with drowned roads and collapsed buildings.57
  14. コトヌー 🇧🇯 ベナンRainy-season flooding · 4月15日〜7月31日（例年）The long rains swamp Cotonou's low-lying districts and neighbouring Abomey-Calavi after heavy downpours, when drains overflow and whole streets sit under water for days.56
  15. 重慶市 🇨🇳 中華人民共和国Yangtze flood season · 6月15日〜9月5日（例年）The summer rains upstream push the Yangtze and Jialing up their banks most years, and in a bad one the lower levels of Hongya Dong and the riverside walks go under for a week.55
  16. マニラ 🇵🇭 フィリピンHabagat and street flooding · 6月1日〜10月15日（例年）The southwest monsoon puts water across España and the low parts of Manila several times a season, and the city calls off work and school when it does.53
  17. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.53
  18. モンロビア 🇱🇷 リベリアFlooded streets in the rains · 6月1日〜9月30日（例年）Heavy downpours overwhelm the drains in low-lying neighbourhoods, turning main roads into rivers and stalling traffic for hours.51
  19. アビジャン 🇨🇮 コートジボワールRainy-season flash floods · 5月15日〜7月15日（例年）The long rains peak around June, and cloudbursts regularly flood low-lying districts, cut roads and trigger deadly landslides on hillside neighbourhoods such as Attecoube and Yopougon.50
  20. バランキージャ 🇨🇴 コロンビアArroyos in the streets · 5月1日〜11月15日（例年）The city drains its downpours down the roads, and within minutes certain streets carry a current that will move a car.50
  21. ラゴス 🇳🇬 ナイジェリアFlash-flood season · 5月1日〜7月20日（例年）Downpours in the main rains flood Victoria Island, Lekki, Ikeja and other districts within hours, turning roads into gridlock; allow hours extra for the airport and avoid driving during a storm.49
  22. コナクリ 🇬🇳 ギニアRainy season floods · 6月20日〜9月15日（例年）Conakry is one of Africa's wettest capitals, and July and August downpours flood low neighbourhoods such as Matoto and Sonfonia, cutting roads and causing deaths most years.48
  23. ジョージタウン 🇬🇾 ガイアナFlooding in the city · 5月1日〜7月31日（例年）Georgetown lies below sea level and drains through canals and kokers that only open at low tide.48
  24. 桂林市 🇨🇳 中華人民共和国Li River flood closures · 5月15日〜7月31日（例年）Heavy rain in the flood season, especially around the Dragon Boat Festival and when typhoon remnants arrive, pushes the Li River towards warning level; the maritime authority then halts every cruise and bamboo raft, sometimes for days.43
  25. ヴァンヴィエン 🇱🇦 ラオスFast, muddy Nam Song · 5月15日〜10月15日（例年）In the rains the river runs high, brown and fast; tubing and kayaking get genuinely risky after heavy downpours.42

…6月はほか2か所。

6月の世界のイベント →

7月の洪水シーズン

  1. ヴロツワフ 🇵🇱 ポーランドOdra high water · 3月1日〜7月31日（例年）The city is built across a dozen islands and channels, and it has been overwhelmed twice in living memory — 1997 and again in 2024.88
  2. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.87
  3. グアダルーペ山脈国立公園 🇺🇸 アメリカ合衆国Monsoon storms and flash floods · 5月15日〜9月30日（例年）The wet months bring heavy afternoon thunderstorms and flash flooding in the canyons, which is also what breaks the heat of the day.77
  4. ケープ・コースト 🇬🇭 ガーナMajor rainy season floods · 5月15日〜7月15日（例年）The heaviest rains of the year fall in May and June; Cape Coast was the worst-hit town in the Central Region floods of June 2026, with drowned roads and collapsed buildings.74
  5. キャピトル・リーフ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）The slot canyons off the Scenic Drive fill from storms that break out of sight, and the dirt roads in the Waterpocket district turn to grease.72
  6. ビッグ・ベンド国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月30日（例年）Afternoon storms put water down the arroyos with no warning and cut the unpaved roads; Old Maverick Road and the Santa Elena approach have been closed by flood damage for long stretches.72
  7. ジュバ 🇸🇸 南スーダンRainy-season road cuts · 5月15日〜10月31日（例年）Juba's own streets stay passable, but the dirt roads beyond turn to deep mud and floodwater, cutting off towns for weeks.72
  8. ザイオン国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Late-summer storms over the plateau put water into slot canyons under blue sky downstream.71
  9. アビジャン 🇨🇮 コートジボワールRainy-season flash floods · 5月15日〜7月15日（例年）The long rains peak around June, and cloudbursts regularly flood low-lying districts, cut roads and trigger deadly landslides on hillside neighbourhoods such as Attecoube and Yopougon.71
  10. モンテレイ 🇲🇽 メキシコTropical rain and flooding · 7月1日〜10月15日（例年）Gulf storms that cross the coast dump their rain on the Sierra Madre behind the city, and the Santa Catarina riverbed fills within hours.70
  11. サン＝ルイ 🇸🇳 セネガルSenegal River flood season · 7月15日〜10月31日（例年）Rain far upstream swells the Senegal River from July to October, and in high years it spills into low-lying mainland neighbourhoods and the northern tip of the island.70
  12. デスヴァレー国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月15日〜9月30日（例年）Late summer storms tear out the unpaved canyon roads most years, and some stay shut for months afterwards.68
  13. カールズバッド洞窟群国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Afternoon storms come off the Guadalupe escarpment and put water across Walnut Canyon Desert Drive and the road up from Whites City.68
  14. サワロ国立公園 🇺🇸 アメリカ合衆国Monsoon season · 6月15日〜9月30日From the middle of June to the end of September the afternoons build storms over the mountains, and the washes and canyons flash-flood fast enough to catch people out.67
  15. コトヌー 🇧🇯 ベナンRainy-season flooding · 4月15日〜7月31日（例年）The long rains swamp Cotonou's low-lying districts and neighbouring Abomey-Calavi after heavy downpours, when drains overflow and whole streets sit under water for days.66
  16. ニアメ 🇳🇪 ニジェールNiger river flooding · 7月15日〜9月30日（例年）Storm runoff and then the river rise put whole neighbourhoods on the right bank under water most years.64
  17. アディスアベバ 🇪🇹 エチオピアKiremt rains flood the roads · 6月20日〜9月15日（例年）The long rains arrive in late June and the first downpours hit drains clogged after months of dust, so streets flood and traffic locks up for hours.61
  18. キャニオンランズ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Afternoon storms fill the canyons from rain that fell miles upstream, and the dirt roads into the Needles and the Maze turn to impassable clay within minutes.60
  19. ラゴス 🇳🇬 ナイジェリアFlash-flood season · 5月1日〜7月20日（例年）Downpours in the main rains flood Victoria Island, Lekki, Ikeja and other districts within hours, turning roads into gridlock; allow hours extra for the airport and avoid driving during a storm.59
  20. ハンピ 🇮🇳 インドTungabhadra dam releases · 7月15日〜9月30日（例年）When the upstream dam fills, its gates open and the river rises fast: riverside ruins such as Purandara Mandapa and the Chakratirtha ghat go under, coracle crossings stop and people on the far bank can be cut off.59
  21. アーチーズ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月15日〜9月15日（例年）Late summer storms send water down slots and washes that were dry an hour earlier, and the rain does not have to be overhead.59
  22. アブジャ 🇳🇬 ナイジェリアFlash floods · 7月1日〜9月30日（例年）The heaviest downpours of the rainy season regularly flood parts of the city, including Wuse 2, Lokogoma and Gwagwalada.59
  23. バランキージャ 🇨🇴 コロンビアArroyos in the streets · 5月1日〜11月15日（例年）The city drains its downpours down the roads, and within minutes certain streets carry a current that will move a car.59
  24. カラチ 🇵🇰 パキスタンUrban flooding · 7月1日〜8月31日（例年）A single heavy spell puts the underpasses and half the main arteries under water and takes the grid down with them.56
  25. ジョージタウン 🇬🇾 ガイアナFlooding in the city · 5月1日〜7月31日（例年）Georgetown lies below sea level and drains through canals and kokers that only open at low tide.55

…7月はほか19か所。

7月の世界のイベント →

8月の洪水シーズン

  1. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.81
  2. グアダルーペ山脈国立公園 🇺🇸 アメリカ合衆国Monsoon storms and flash floods · 5月15日〜9月30日（例年）The wet months bring heavy afternoon thunderstorms and flash flooding in the canyons, which is also what breaks the heat of the day.79
  3. キャピトル・リーフ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）The slot canyons off the Scenic Drive fill from storms that break out of sight, and the dirt roads in the Waterpocket district turn to grease.77
  4. ザイオン国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Late-summer storms over the plateau put water into slot canyons under blue sky downstream.75
  5. ビッグ・ベンド国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月30日（例年）Afternoon storms put water down the arroyos with no warning and cut the unpaved roads; Old Maverick Road and the Santa Elena approach have been closed by flood damage for long stretches.73
  6. モンテレイ 🇲🇽 メキシコTropical rain and flooding · 7月1日〜10月15日（例年）Gulf storms that cross the coast dump their rain on the Sierra Madre behind the city, and the Santa Catarina riverbed fills within hours.72
  7. デスヴァレー国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月15日〜9月30日（例年）Late summer storms tear out the unpaved canyon roads most years, and some stay shut for months afterwards.71
  8. ジュバ 🇸🇸 南スーダンRainy-season road cuts · 5月15日〜10月31日（例年）Juba's own streets stay passable, but the dirt roads beyond turn to deep mud and floodwater, cutting off towns for weeks.71
  9. サワロ国立公園 🇺🇸 アメリカ合衆国Monsoon season · 6月15日〜9月30日From the middle of June to the end of September the afternoons build storms over the mountains, and the washes and canyons flash-flood fast enough to catch people out.70
  10. キャニオンランズ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Afternoon storms fill the canyons from rain that fell miles upstream, and the dirt roads into the Needles and the Maze turn to impassable clay within minutes.69
  11. ヌアクショット 🇲🇷 モーリタニアFlooded districts after storms · 8月1日〜9月30日（例年）Parts of the city lie below sea level with almost no storm drains, so the few heavy downpours of the short rainy season leave Sebkha and El Mina under standing water for days, cutting roads.69
  12. アーチーズ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月15日〜9月15日（例年）Late summer storms send water down slots and washes that were dry an hour earlier, and the rain does not have to be overhead.68
  13. カールズバッド洞窟群国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Afternoon storms come off the Guadalupe escarpment and put water across Walnut Canyon Desert Drive and the road up from Whites City.67
  14. ハンピ 🇮🇳 インドTungabhadra dam releases · 7月15日〜9月30日（例年）When the upstream dam fills, its gates open and the river rises fast: riverside ruins such as Purandara Mandapa and the Chakratirtha ghat go under, coracle crossings stop and people on the far bank can be cut off.65
  15. サン＝ルイ 🇸🇳 セネガルSenegal River flood season · 7月15日〜10月31日（例年）Rain far upstream swells the Senegal River from July to October, and in high years it spills into low-lying mainland neighbourhoods and the northern tip of the island.64
  16. アディスアベバ 🇪🇹 エチオピアKiremt rains flood the roads · 6月20日〜9月15日（例年）The long rains arrive in late June and the first downpours hit drains clogged after months of dust, so streets flood and traffic locks up for hours.63
  17. ニアメ 🇳🇪 ニジェールNiger river flooding · 7月15日〜9月30日（例年）Storm runoff and then the river rise put whole neighbourhoods on the right bank under water most years.63
  18. モアブ 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月10日〜9月15日（例年）Storms that break fifty miles upstream fill the slot canyons here with no warning, and the road into Canyonlands' Needles has been cut by debris more than once.60
  19. カラチ 🇵🇰 パキスタンUrban flooding · 7月1日〜8月31日（例年）A single heavy spell puts the underpasses and half the main arteries under water and takes the grid down with them.60
  20. イスラマバード 🇵🇰 パキスタンNullah flooding · 7月1日〜8月31日（例年）A cell parking over the Margallas fills the storm channels through the sectors within the hour and takes the Expressway underpasses with them.56
  21. プナカ 🇧🇹 ブータンGlacial flood risk on the rivers · 6月1日〜10月15日（例年）The Mo Chhu and Pho Chhu, which meet at the dzong, are fed by glacial lakes upstream that have burst before: floods in 1957, 1960, 1994 and 1996 each damaged Punakha Dzong, the worst killing 23 people.55
  22. アブジャ 🇳🇬 ナイジェリアFlash floods · 7月1日〜9月30日（例年）The heaviest downpours of the rainy season regularly flood parts of the city, including Wuse 2, Lokogoma and Gwagwalada.53
  23. モンロビア 🇱🇷 リベリアFlooded streets in the rains · 6月1日〜9月30日（例年）Heavy downpours overwhelm the drains in low-lying neighbourhoods, turning main roads into rivers and stalling traffic for hours.53
  24. バランキージャ 🇨🇴 コロンビアArroyos in the streets · 5月1日〜11月15日（例年）The city drains its downpours down the roads, and within minutes certain streets carry a current that will move a car.53
  25. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.52

…8月はほか14か所。

8月の世界のイベント →

9月の洪水シーズン

  1. アヴィニョン 🇫🇷 フランスAutumn flash floods · 9月10日〜11月30日（例年）Mediterranean downpours can drop months of rain in a few hours on the Vaucluse and Gard in autumn.89
  2. マラガ 🇪🇸 スペインAutumn storms and flash floods · 9月1日〜11月30日（例年）A cut-off low over a warm Mediterranean can drop a season's rain in a few hours, and the dry riverbeds inland are what carry it into the towns.85
  3. ジェノヴァ 🇮🇹 イタリアAutumn flash floods · 9月15日〜11月30日Warm sea and steep hills behind a narrow city produce autumn storms that drop a month of rain in hours.85
  4. グアダルーペ山脈国立公園 🇺🇸 アメリカ合衆国Monsoon storms and flash floods · 5月15日〜9月30日（例年）The wet months bring heavy afternoon thunderstorms and flash flooding in the canyons, which is also what breaks the heat of the day.83
  5. ハンブルク 🇩🇪 ドイツStorm surge season · 9月15日〜3月31日The city counts its storm tide season from mid-September to the end of March.82
  6. キャピトル・リーフ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）The slot canyons off the Scenic Drive fill from storms that break out of sight, and the dirt roads in the Waterpocket district turn to grease.82
  7. バレンシア 🇪🇸 スペインGota fria and DANA storms · 9月1日〜11月15日Autumn is when a cut-off low over a warm Mediterranean can drop a season's rain on the coastal plain in hours.80
  8. ザイオン国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Late-summer storms over the plateau put water into slot canyons under blue sky downstream.80
  9. モアブ 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月10日〜9月15日（例年）Storms that break fifty miles upstream fill the slot canyons here with no warning, and the road into Canyonlands' Needles has been cut by debris more than once.80
  10. デスヴァレー国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月15日〜9月30日（例年）Late summer storms tear out the unpaved canyon roads most years, and some stay shut for months afterwards.79
  11. アリカンテ 🇪🇸 スペインGota fria storms · 9月1日〜11月15日（例年）Autumn on this coast delivers its rain in a day or two rather than in showers, and the ramblas that are dry all year are the reason those days close roads.79
  12. ベニドルム 🇪🇸 スペインGota fria storms · 9月1日〜11月15日（例年）Autumn rain on this coast arrives as one or two violent days rather than as drizzle, and those days flood the dry ravines and shut the coast road.79
  13. アーチーズ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月15日〜9月15日（例年）Late summer storms send water down slots and washes that were dry an hour earlier, and the rain does not have to be overhead.78
  14. キャニオンランズ国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Afternoon storms fill the canyons from rain that fell miles upstream, and the dirt roads into the Needles and the Maze turn to impassable clay within minutes.78
  15. ビッグ・ベンド国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月30日（例年）Afternoon storms put water down the arroyos with no warning and cut the unpaved roads; Old Maverick Road and the Santa Elena approach have been closed by flood damage for long stretches.77
  16. カールズバッド洞窟群国立公園 🇺🇸 アメリカ合衆国Monsoon flash floods · 7月1日〜9月20日（例年）Afternoon storms come off the Guadalupe escarpment and put water across Walnut Canyon Desert Drive and the road up from Whites City.76
  17. サワロ国立公園 🇺🇸 アメリカ合衆国Monsoon season · 6月15日〜9月30日From the middle of June to the end of September the afternoons build storms over the mountains, and the washes and canyons flash-flood fast enough to catch people out.75
  18. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.75
  19. モンテレイ 🇲🇽 メキシコTropical rain and flooding · 7月1日〜10月15日（例年）Gulf storms that cross the coast dump their rain on the Sierra Madre behind the city, and the Santa Catarina riverbed fills within hours.73
  20. ジュバ 🇸🇸 南スーダンRainy-season road cuts · 5月15日〜10月31日（例年）Juba's own streets stay passable, but the dirt roads beyond turn to deep mud and floodwater, cutting off towns for weeks.72
  21. チャールストン 🇺🇸 アメリカ合衆国King tide flooding · 9月1日〜11月15日（例年）The highest autumn tides put salt water over the Battery and into the lower peninsula streets on clear days, no storm required.69
  22. ハンピ 🇮🇳 インドTungabhadra dam releases · 7月15日〜9月30日（例年）When the upstream dam fills, its gates open and the river rises fast: riverside ruins such as Purandara Mandapa and the Chakratirtha ghat go under, coracle crossings stop and people on the far bank can be cut off.68
  23. アディスアベバ 🇪🇹 エチオピアKiremt rains flood the roads · 6月20日〜9月15日（例年）The long rains arrive in late June and the first downpours hit drains clogged after months of dust, so streets flood and traffic locks up for hours.67
  24. ニアメ 🇳🇪 ニジェールNiger river flooding · 7月15日〜9月30日（例年）Storm runoff and then the river rise put whole neighbourhoods on the right bank under water most years.66
  25. ヤウンデ 🇨🇲 カメルーンFlash-flood season · 9月1日〜10月31日（例年）The heaviest downpours of the year overwhelm blocked drains along the Mfoundi; streets in the centre around Avenue Kennedy and the Mfoundi market, and districts like Melen and Ekounou, flood and traffic stalls.65

…9月はほか27か所。

9月の世界のイベント →

10月の洪水シーズン

  1. マラガ 🇪🇸 スペインAutumn storms and flash floods · 9月1日〜11月30日（例年）A cut-off low over a warm Mediterranean can drop a season's rain in a few hours, and the dry riverbeds inland are what carry it into the towns.89
  2. アリカンテ 🇪🇸 スペインGota fria storms · 9月1日〜11月15日（例年）Autumn on this coast delivers its rain in a day or two rather than in showers, and the ramblas that are dry all year are the reason those days close roads.89
  3. ベニドルム 🇪🇸 スペインGota fria storms · 9月1日〜11月15日（例年）Autumn rain on this coast arrives as one or two violent days rather than as drizzle, and those days flood the dry ravines and shut the coast road.89
  4. バレンシア 🇪🇸 スペインGota fria and DANA storms · 9月1日〜11月15日Autumn is when a cut-off low over a warm Mediterranean can drop a season's rain on the coastal plain in hours.88
  5. チャールストン 🇺🇸 アメリカ合衆国King tide flooding · 9月1日〜11月15日（例年）The highest autumn tides put salt water over the Battery and into the lower peninsula streets on clear days, no storm required.85
  6. モンテレイ 🇲🇽 メキシコTropical rain and flooding · 7月1日〜10月15日（例年）Gulf storms that cross the coast dump their rain on the Sierra Madre behind the city, and the Santa Catarina riverbed fills within hours.84
  7. アヴィニョン 🇫🇷 フランスAutumn flash floods · 9月10日〜11月30日（例年）Mediterranean downpours can drop months of rain in a few hours on the Vaucluse and Gard in autumn.81
  8. ヴェネツィア 🇮🇹 イタリアAcqua alta season · 10月1日〜1月15日（例年）High water comes with the autumn tides.79
  9. ダハブ 🇪🇬 エジプトSinai flash floods · 10月15日〜3月15日（例年）Rare and violent: a storm over the mountains sends water down the wadis and across the coast road, cutting the runs to Nuweiba and St Catherine for a day.77
  10. ジェノヴァ 🇮🇹 イタリアAutumn flash floods · 9月15日〜11月30日Warm sea and steep hills behind a narrow city produce autumn storms that drop a month of rain in hours.76
  11. コモ 🇮🇹 イタリアLake floods the lakefront · 10月1日〜12月15日（例年）Autumn rain lifts the lake over the walls into Piazza Cavour most years, which is why the city has spent two decades building barriers.75
  12. プナカ 🇧🇹 ブータンGlacial flood risk on the rivers · 6月1日〜10月15日（例年）The Mo Chhu and Pho Chhu, which meet at the dzong, are fed by glacial lakes upstream that have burst before: floods in 1957, 1960, 1994 and 1996 each damaged Punakha Dzong, the worst killing 23 people.75
  13. チンクエ・テッレ 🇮🇹 イタリアAutumn storm trail closures · 10月1日〜11月30日（例年）Autumn brings the downpours that flattened Vernazza and Monterosso in 2011.73
  14. アカバ 🇯🇴 ヨルダンWadi flash-flood season · 10月15日〜3月31日（例年）Rain over the mountains behind town runs off bare rock and crosses the roads out to Wadi Rum and the Dead Sea.72
  15. ハンブルク 🇩🇪 ドイツStorm surge season · 9月15日〜3月31日The city counts its storm tide season from mid-September to the end of March.69
  16. バグダード 🇮🇶 イラクStreet flooding in the first rains · 10月25日〜1月31日（例年）The season's first heavy downpours regularly overwhelm Baghdad's drainage and pumping stations: underpasses and main roads flood, traffic seizes up and some districts sit in water for a day or more.69
  17. ジュバ 🇸🇸 南スーダンRainy-season road cuts · 5月15日〜10月31日（例年）Juba's own streets stay passable, but the dirt roads beyond turn to deep mud and floodwater, cutting off towns for weeks.69
  18. マイアミ 🇺🇸 アメリカ合衆国King tide flooding · 9月1日〜11月15日（例年）The year's highest tides push seawater up through the storm drains on clear days, closing streets in Miami Beach and Brickell for a few hours around the new and full moons.63
  19. ヴァンヴィエン 🇱🇦 ラオスFast, muddy Nam Song · 5月15日〜10月15日（例年）In the rains the river runs high, brown and fast; tubing and kayaking get genuinely risky after heavy downpours.63
  20. バンギ 🇨🇫 中央アフリカ共和国Ubangi River flood season · 10月1日〜11月30日（例年）The river peaks at the end of the rains and low-lying riverside districts of Bangui and Bimbo can flood; in 2019 it burst its banks in mid-October and tens of thousands in the city were affected.63
  21. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.63
  22. サン＝ルイ 🇸🇳 セネガルSenegal River flood season · 7月15日〜10月31日（例年）Rain far upstream swells the Senegal River from July to October, and in high years it spills into low-lying mainland neighbourhoods and the northern tip of the island.63
  23. コトヌー 🇧🇯 ベナンOueme river flood · 9月1日〜10月31日（例年）Later in the year the Oueme river spills into Lake Nokoue, flooding lakeside quarters such as Vossa, Fifadji and Dandji even when it is not raining in the city.60
  24. ヤウンデ 🇨🇲 カメルーンFlash-flood season · 9月1日〜10月31日（例年）The heaviest downpours of the year overwhelm blocked drains along the Mfoundi; streets in the centre around Avenue Kennedy and the Mfoundi market, and districts like Melen and Ekounou, flood and traffic stalls.59
  25. テーサバーンナコーン・プラナコーンシーアユッタヤー 🇹🇭 タイ王国Flood season on the rivers · 9月1日〜11月15日（例年）Discharge from the Chao Phraya dam upstream backs into the low districts around the island most years, closing riverside roads and some outlying temples for days at a time.56

…10月はほか9か所。

10月の世界のイベント →

11月の洪水シーズン

  1. アレクサンドリア 🇪🇬 エジプトWinter storms off the sea · 11月15日〜3月15日（例年）Named storms come in off the Mediterranean every few weeks and the drains give up before the rain does: flooded underpasses, closed corniche lanes, a day written off.92
  2. ペトラ 🇯🇴 ヨルダンFlash-flood closures · 11月1日〜3月31日The Siq is a drain for a wide catchment, and after heavy rain on the plateau the authority evacuates the site with little warning.91
  3. バグダード 🇮🇶 イラクStreet flooding in the first rains · 10月25日〜1月31日（例年）The season's first heavy downpours regularly overwhelm Baghdad's drainage and pumping stations: underpasses and main roads flood, traffic seizes up and some districts sit in water for a day or more.89
  4. アリカンテ 🇪🇸 スペインGota fria storms · 9月1日〜11月15日（例年）Autumn on this coast delivers its rain in a day or two rather than in showers, and the ramblas that are dry all year are the reason those days close roads.89
  5. マラガ 🇪🇸 スペインAutumn storms and flash floods · 9月1日〜11月30日（例年）A cut-off low over a warm Mediterranean can drop a season's rain in a few hours, and the dry riverbeds inland are what carry it into the towns.87
  6. ベニドルム 🇪🇸 スペインGota fria storms · 9月1日〜11月15日（例年）Autumn rain on this coast arrives as one or two violent days rather than as drizzle, and those days flood the dry ravines and shut the coast road.87
  7. ワディ・ラム 🇯🇴 ヨルダンFlash floods in the wadis · 11月1日〜3月31日（例年）Rain on the plateau runs off bare rock and fills the wadis within minutes, and the desert tracks and the road in can both be cut for a day.87
  8. チャールストン 🇺🇸 アメリカ合衆国King tide flooding · 9月1日〜11月15日（例年）The highest autumn tides put salt water over the Battery and into the lower peninsula streets on clear days, no storm required.86
  9. ダハブ 🇪🇬 エジプトSinai flash floods · 10月15日〜3月15日（例年）Rare and violent: a storm over the mountains sends water down the wadis and across the coast road, cutting the runs to Nuweiba and St Catherine for a day.86
  10. 死海 🇯🇴 ヨルダンWadi flash-flood season · 11月1日〜3月31日Rain falling on the highlands drains into the canyons that come down to the shore, and the valley road and every side wadi close at short notice.86
  11. バレンシア 🇪🇸 スペインGota fria and DANA storms · 9月1日〜11月15日Autumn is when a cut-off low over a warm Mediterranean can drop a season's rain on the coastal plain in hours.85
  12. アカバ 🇯🇴 ヨルダンWadi flash-flood season · 10月15日〜3月31日（例年）Rain over the mountains behind town runs off bare rock and crosses the roads out to Wadi Rum and the Dead Sea.83
  13. メッカ 🇸🇦 サウジアラビアWinter flash floods · 11月1日〜1月31日（例年）The valley takes most of its rain in a handful of storms and the runoff comes off bare rock into the streets, shutting underpasses and approach roads for a few hours.76
  14. マイアミ 🇺🇸 アメリカ合衆国King tide flooding · 9月1日〜11月15日（例年）The year's highest tides push seawater up through the storm drains on clear days, closing streets in Miami Beach and Brickell for a few hours around the new and full moons.73
  15. バンギ 🇨🇫 中央アフリカ共和国Ubangi River flood season · 10月1日〜11月30日（例年）The river peaks at the end of the rains and low-lying riverside districts of Bangui and Bimbo can flood; in 2019 it burst its banks in mid-October and tens of thousands in the city were affected.71
  16. テーサバーンナコーン・プラナコーンシーアユッタヤー 🇹🇭 タイ王国Flood season on the rivers · 9月1日〜11月15日（例年）Discharge from the Chao Phraya dam upstream backs into the low districts around the island most years, closing riverside roads and some outlying temples for days at a time.70
  17. アヴィニョン 🇫🇷 フランスAutumn flash floods · 9月10日〜11月30日（例年）Mediterranean downpours can drop months of rain in a few hours on the Vaucluse and Gard in autumn.70
  18. ジェノヴァ 🇮🇹 イタリアAutumn flash floods · 9月15日〜11月30日Warm sea and steep hills behind a narrow city produce autumn storms that drop a month of rain in hours.67
  19. チンクエ・テッレ 🇮🇹 イタリアAutumn storm trail closures · 10月1日〜11月30日（例年）Autumn brings the downpours that flattened Vernazza and Monterosso in 2011.67
  20. バンコク 🇹🇭 タイ王国Chao Phraya flood season · 9月15日〜11月15日（例年）The upstream runoff peaks after the monsoon has moved on, and a high tide on top of it puts the riverside walkways and the low sois behind them under water for a few days at a time.65
  21. コモ 🇮🇹 イタリアLake floods the lakefront · 10月1日〜12月15日（例年）Autumn rain lifts the lake over the walls into Piazza Cavour most years, which is why the city has spent two decades building barriers.65
  22. ヴェネツィア 🇮🇹 イタリアAcqua alta season · 10月1日〜1月15日（例年）High water comes with the autumn tides.63
  23. プエルト・イグアス 🇦🇷 アルゼンチンGarganta walkway shut in flood · 11月1日〜4月30日（例年）Summer rain upriver can put the Iguazu over the catwalk to the Devil's Throat balcony, and the circuit shuts until the flow drops.62
  24. フォス・ド・イグアス 🇧🇷 ブラジルDevil's Throat walkway shut · 11月1日〜4月30日（例年）When the Iguacu runs above the safe limit the catwalk out to the Devil's Throat closes on both sides, sometimes for days.62
  25. パラチー 🇧🇷 ブラジルSea into the streets · 1月1日〜12月31日The colonial centre was laid below the spring-tide line on purpose, so around the full and new moons the sea comes up through the seawall openings and drains back out, taking the day's dirt with it.62

…11月はほか11か所。

11月の世界のイベント →

12月の洪水シーズン

  1. アカバ 🇯🇴 ヨルダンWadi flash-flood season · 10月15日〜3月31日（例年）Rain over the mountains behind town runs off bare rock and crosses the roads out to Wadi Rum and the Dead Sea.93
  2. カファジャーテ・デパルタメント 🇦🇷 アルゼンチンSummer storm road closures · 12月15日〜3月15日（例年）The valley's rain arrives as short violent summer storms and the Quebrada de las Conchas road towards Salta closes for rockfall and washed-out crossings.91
  3. ダハブ 🇪🇬 エジプトSinai flash floods · 10月15日〜3月15日（例年）Rare and violent: a storm over the mountains sends water down the wadis and across the coast road, cutting the runs to Nuweiba and St Catherine for a day.90
  4. アレクサンドリア 🇪🇬 エジプトWinter storms off the sea · 11月15日〜3月15日（例年）Named storms come in off the Mediterranean every few weeks and the drains give up before the rain does: flooded underpasses, closed corniche lanes, a day written off.88
  5. 死海 🇯🇴 ヨルダンWadi flash-flood season · 11月1日〜3月31日Rain falling on the highlands drains into the canyons that come down to the shore, and the valley road and every side wadi close at short notice.85
  6. フジャイラ市 🇦🇪 アラブ首長国連邦Winter rain and wadi floods · 12月1日〜3月31日（例年）This is the wettest corner of the Emirates, and a day of rain on the Hajar mountains sends water down the wadis fast enough to cut the roads.85
  7. メッカ 🇸🇦 サウジアラビアWinter flash floods · 11月1日〜1月31日（例年）The valley takes most of its rain in a handful of storms and the runoff comes off bare rock into the streets, shutting underpasses and approach roads for a few hours.83
  8. ペトラ 🇯🇴 ヨルダンFlash-flood closures · 11月1日〜3月31日The Siq is a drain for a wide catchment, and after heavy rain on the plateau the authority evacuates the site with little warning.82
  9. ワディ・ラム 🇯🇴 ヨルダンFlash floods in the wadis · 11月1日〜3月31日（例年）Rain on the plateau runs off bare rock and fills the wadis within minutes, and the desert tracks and the road in can both be cut for a day.78
  10. ハラレ 🇿🇼 ジンバブエFlash floods in the heavy rains · 12月1日〜3月15日（例年）Afternoon storms at the height of the rains overwhelm drains in the city centre and low-lying suburbs such as Mbare, Glen View and Budiriro.77
  11. バグダード 🇮🇶 イラクStreet flooding in the first rains · 10月25日〜1月31日（例年）The season's first heavy downpours regularly overwhelm Baghdad's drainage and pumping stations: underpasses and main roads flood, traffic seizes up and some districts sit in water for a day or more.77
  12. ハボローネ 🇧🇼 ボツワナSummer flash floods · 12月1日〜3月15日（例年）Intense summer storms can overwhelm the city's drainage; the February 2025 floods killed people in Gaborone and closed roads, bridges and schools.74
  13. サンパウロ 🇧🇷 ブラジルSummer storms and flooding · 12月1日〜3月31日（例年）Late-afternoon storms most days through the southern summer, and the ones that stall put the Tiete and the marginais under water and the traffic at a standstill for hours.72
  14. ホーチミン市 🇻🇳 ベトナムPeak tide flooding · 9月15日〜12月15日（例年）The year's highest tides push the river back into District 7, Nha Be and Binh Chanh, usually around the new and full moons.69
  15. ルサカ 🇿🇲 ザンビアRainy-season flooding · 12月1日〜3月31日（例年）Poor drainage and dense informal settlements mean heavy rains regularly submerge roads and low-lying suburbs each rainy season.69
  16. コインブラ 🇵🇹 ポルトガルMondego river floods · 12月15日〜3月15日（例年）In wet winters the Mondego tops its banks: the riverside cafes of Parque Verde and the grounds of Santa Clara-a-Velha go under, and in the worst storms low-lying Baixa streets and schools close.67
  17. サルタ 🇦🇷 アルゼンチンSummer rain closes the mountain roads · 12月15日〜3月15日（例年）Storms in the southern summer send debris over the Cuesta del Obispo and the road down to Cafayate, and either can shut for a day.66
  18. フランツ・ジョセフ氷河 🇳🇿 ニュージーランドHighway closures in heavy rain · 1月1日〜12月31日There is one road in and one road out, and a big West Coast rain event closes it north or south of the village a few times a year.64
  19. コモ 🇮🇹 イタリアLake floods the lakefront · 10月1日〜12月15日（例年）Autumn rain lifts the lake over the walls into Piazza Cavour most years, which is why the city has spent two decades building barriers.61
  20. フォンニャ＝ケバン国立公園 🇻🇳 ベトナムFlood closures in the caves · 9月1日〜12月15日（例年）The wet months put the Son and Chay rivers up through the show caves and the big expeditions stop entirely.61
  21. ウルル 🇦🇺 オーストラリアSummer storms and waterfalls · 12月1日〜3月15日（例年）Thunderstorms come off the desert in the hot months and the rock runs with waterfalls for a few hours, which is the sight nobody plans for.59
  22. コンガリー国立公園 🇺🇸 アメリカ合衆国Floodwater on the boardwalk · 12月1日〜4月30日（例年）The floodplain takes water about ten times a year, most often in the wet half, and a rise puts the backcountry trails and parts of the boardwalk underwater.59
  23. ブラザヴィル 🇨🇬 コンゴ共和国Congo River flood season · 11月15日〜1月31日（例年）The river runs highest at the end of the year while storms overwhelm the drains, so low-lying districts such as Talangai and Mfilou can flood and roads get cut.59
  24. ヴェネツィア 🇮🇹 イタリアAcqua alta season · 10月1日〜1月15日（例年）High water comes with the autumn tides.58
  25. フエ 🇻🇳 ベトナムFlood season · 9月25日〜12月15日（例年）Hue is the wettest city in the country and the Perfume River comes up into the low streets most years, sometimes for days.57

…12月はほか12か所。

12月の世界のイベント →

洪水シーズン — 世界の月別ガイド | SeasonMap