ハコ 9月の天気
ハコの9月:猛暑、大雨続き、空気がきれい — 雨の日30日があり、運次第の時期。
2026年9月更新 · ERA5再解析による気候平年値
ハコでは12か月中11位 · 9月に訪れたい旅行先で1413か所中1199位 · 快適スコア56/100(Dランク)
- 日中
- 28°C
- 夜
- 24°C
- 雨の日
- 30
- 日照
- 7.6 h
- 湿度
- 89%
- 日の長さ
- 12 h

9月のハコについての旅行者の声
近くのモンテベルデからのメモ(81 km)
ハコには9月のメモがまだありません — これは季節を共にする近くのモンテベルデについてのメモです。
Monteverde-forum threads on September describe this as genuinely deep in the region's off-season, a real tradeoff of fewer crowds against a much higher chance of unsettled conditions on a given day. Posters are consistent showers here often fall overnight rather than through the day, so a visitor can still get a clear, workable stretch for the canopy walks and reserve trails even during a heavier week overall. One short-stay visitor called themselves lucky with a genuinely beautiful couple of days despite planning around the reputation. Regulars describe the elevation as keeping things noticeably cool whenever the cloud cover thins, real layers worth having regardless of how warm San Jose or the coast felt on the same trip. Unpaved roads into town are called noticeably trickier this time of year, a higher-clearance vehicle a real asset. The record: 23.5C days feeling like 25C, 17.9C nights, an extraordinarily high 391mm across nearly 29 days and 90 percent humidity.
ハコのほかの月
Regulars are specific this area reads as genuinely drier than areas further south along the same coast, where the rainy season doesn't properly end until mid-to-late December, though conditions here have shifted from the old reputation of reliably rain-free North winds - even the tail end of the month can now bring real rain some years. Our row backs that hot, genuinely wet read, 27.6C reading as a scorching 33C, over 24C nights feeling 29C, with a substantial 278.6mm of rain across 28.5 days and humidity at 86 percent. Regulars are consistent Costa Rica's weather is genuinely location-dependent given how many separate weather systems affect the country, no single verdict applying evenly countrywide. The sea sits at a bath-warm 29.1C. The record: 9.9 hours of sun, a 9.7 kph wind and AQI 32.
The consensus on April for this coast is that it is transitional - not the driest, nowhere near the wettest - and our row proves it exactly: 242.9mm here against 581.8mm in May and 829.3mm in October. What the numbers cannot show is the timing, and the board supplies it: rain on the central Pacific coast comes in the afternoon or overnight, it is warm rain, and the weather apps that promise rain all day every day are wrong about the shape while right about the odds. Our 27.6 rainy days is that same statement. Pack fast-drying clothes rather than cotton, and something light to keep it off. Heat holds at 29.1C reading as 36C, with a 30.3C sea. The record: humidity 83 percent, 10.4 hours of sun and AQI 36.
January opens the hottest, driest run of the Costa Rican year, with strong sun and lower humidity - and regulars still say to expect some rain most days, generally in the afternoon or at night. Our 22.2 precipitation days across 120.4mm is that, five millimetres a day, and one visitor's accounting is the clearest version: roughly eight hours of rain across a week, five of them after dark. Their weather apps had predicted rain daily. The date worth knowing is the 6th: the first days of January are peak holiday travel, and waiting until after about then means the Christmas crowds have gone and prices ease, though it stays high season. A light poncho and a small umbrella cover it. The record: 28.4C over 24.4C reading as 34C, a 28.9C sea and AQI 33.
March is inside the driest and hottest stretch of the Costa Rican year, and our row's 19.7 precipitation days would say otherwise until you read the phrase regulars use: intermittent thunderstorms that do not produce much rain. That is 87.4mm spread across those days, under five millimetres each. Being socked in for days would be strange now; rain is always possible and rarely severe. What the dry season does bring is heat on the coast - 29.6C over a 25.4C night reads as 36C and 30C at 77 percent humidity, and with the Pacific at 29.9C there is nothing cool to get into. Their own figures, high 80s by day and mid 70s at night, match ours closely. The record: 11 hours of sun, a 12.4 kph wind and AQI 38.
地図のハコのカードから自分のメモを追加できます。
ハコの気候平年値 — 9月
ERA5再解析による月平均値です。AQIはその月の平均US AQI(米国大気質指数)です。
9月のハコの混雑
その場所自体の混み具合 — 学校休暇や大型連休、編集部がタグ付けした月、そして天気の良さによる人気の高さ。快適スコアには含まれません。
閑散主な訪問国のうち2か国で学校休暇、天気が一年で最も悪い月のひとつ(推定)
ピークの混雑混雑ショルダーシーズン閑散
ハコの天気が良い月
この旅行先自身の一年間の快適スコアでランキングしています — 混み具合とは別のものです(上の「混雑」を参照)。
天気が厳しいハコの天気がピークを迎えるのは1月〜3月で、特に良いのは2月ごろです。
天気が最高天気はまずまず天気が厳しい
9月のハコのイベント
毎年の季節のイベント、自然の見どころ、休業、祝日 — 厳選し出典を明記しています。
- 季節
South swell season
4月1日〜10月31日 · 例年サーフシーズンThe southern-hemisphere swells arrive through the middle of the year. Playa Hermosa a few minutes down the coast is the serious wave and holds national contests; Jaco's own beach is where people learn.
- 季節
Green season
5月1日〜11月30日 · 例年モンスーンMornings stay clear and the rain comes after lunch, hard and short. Rates drop by a third, the hills opposite turn over, and September and October are the two months that genuinely stay grey.
- 自然
Humpback whales
7月15日〜11月15日 · 例年ホエールシーズンSouthern-hemisphere humpbacks calve along this coast from July into November, which with the northern group arriving December to March gives Costa Rica one of the longest whale seasons anywhere.
- 自然
Olive ridley nesting
8月15日〜12月15日 · 例年ウミガメの産卵Olive ridleys nest on Playa Hermosa from August, heaviest through September and October, and the hatchery releases at dusk. The beach is patrolled at night and you go with the project or not at all.
- 季節
Wet season
モンスーンリスク30 rainy days and about 720 mm in the month — the real kind of rainy season, not afternoon showers.
気候の平年値から算出
近くで開催中のイベント
ハコから300 km以内 — 日帰りやちょっとした移動で行けて、今月何かがある場所です。快適スコアには含まれません。
ハコはどこにある?
9月のハコ — よくある質問
- 9月はハコを訪れるのに良い時期ですか?
- ハコの9月:猛暑、大雨続き、空気がきれい — 雨の日30日があり、運次第の時期。SeasonMapの快適スコアでは、ハコの12か月中11位です(56/100)。
- 9月のハコはどんな天気ですか?
- 9月のハコは、平均最高気温27.7°C、最低気温24.3°C、降水量は約719.5 mmで、雨の日はおよそ30日です。
- 9月のハコの大気質はどうですか?
- 9月のハコの米国大気質指数(US AQI)は、平均約26です。
300 km圏内:NosaraのArribada at Ostional(7月1日〜12月31日ごろ)、TortugueroのGreen turtle nesting(7月1日〜10月31日)。