キーウェスト 5月の天気
キーウェストの5月:猛暑、雨が多い、空気がきれい — 蒸し暑さが気にならなければ悪くない時期。
2026年9月更新 · ERA5再解析による気候平年値
キーウェストでは12か月中5位 · 5月に訪れたい旅行先で1413か所中444位 · 快適スコア85/100(Aランク)
- 日中
- 30°C
- 夜
- 24°C
- 雨の日
- 7
- 日照
- 11.9 h
- 湿度
- 77%
- 日の長さ
- 13 h

5月のキーウェストについての旅行者の声
Regulars call this a transitional month rather than a settled one - awesome, un-oppressive weather in some years, hot and humid in others, with the one consistent change being winter's wind finally easing off, which makes it a favoured month for getting out on the water. Our row leans toward the warmer read, 30.2C reading as 34C at 77.1 percent humidity, over 24.1C nights, with 103.6mm of rain across 6.9 days. Regulars are specific about the calendar that follows: real humidity builds from late May, June brings the heat and the start of hurricane season in earnest, so May is the last easy month before both arrive. The sea stays calm and warm at 28.6C, good for fishing and snorkelling either way. The record: 11.9 hours of sun, a 25.7 kph wind and AQI 44.
キーウェストのほかの月
Regulars are consistent this counts as genuinely pleasant overall, warm and sunny with little rain chance the norm, though several cold fronts each winter bring a handful of windy, noticeably chillier days, temperatures dropping 10-15 degrees below the run of the month. Our row backs that mild, still-dry read, 23.9C over 17.9C nights, with 46.9mm of rain across 5.2 days and a real 30.9 kph wind. Regulars are consistent this is high season here, prices climbing accordingly, jeans and a light sweater the standard packing advice for evenings and any cold-front days rather than a full coat. The sea sits at a swimmable 24.6C despite the water reading cooler than the air on paper. The record: humidity 77 percent, 9 hours of sun and AQI 45.
Key West-forum threads on November weather call it, along with October, one of the genuinely nice stretches of the year - warm days, cool nights, humidity down from summer's peak, closer in feel to spring than to the hurricane-season months just before it. Showers do still happen, but posters say it's rare for one to be more than something passing through rather than a washed-out day, and some stretches go by without a cloud in sight. The end of the month can turn unpredictable - a late-season storm or a couple of chillier days are possible - but the average still comes out ahead of what preceded it. High-season lodging rates don't kick in until mid-December, making early November good value too, alongside a couple of specific events in the first half of the month. The record: 27.3C days feeling like 29C, 21.9C nights, 68mm across 4.9 days, a 27.4C sea, 76 percent humidity, wind averaging over 29 km/h and 9.5 hours of sun.
February in Key West is sunny and mostly dry - our row gives 41.4mm across 3.7 days - with an average high near 76F and a low near 66F, and most visitors getting 70s-to-80s days and cool nights. The word regulars repeat is windy. Our row's 28.6 kph is the strongest wind of the Key West year, and the consequences they list are the water ones: it is not a great month for water activities, and the wind is enough to make the ferry a poor bet. A cold front can also drop a couple of days into low-60s highs and low-50s nights, which is why the packing advice is shorts plus one sweatshirt. This is also peak season. The record: 26C days, 19.9C nights, 10.1 hours of sun and a 25.3C sea.
April in Key West is a single planning question on the forum: which side of Easter are you on. The busiest weeks sit right around it, mostly families on spring vacation rather than a rowdy college crowd, and regulars say it thins out noticeably afterwards - late April is the sweet spot, with warm water and the crowds gone. The weather argument for the month is that the humidity has not come back yet and little falls. Wind is the one caveat they raise: April is reliably breezy, enough to spoil some days on the water, and sargassum turns up or does not depending on which way it is blowing. The record: 28.7C days feeling like 31C, 22.5C nights, 4.4 precipitation days, 11.6 hours of sun, a 27C sea and a 28 kph wind.
地図のキーウェストのカードから自分のメモを追加できます。
キーウェストの気候平年値 — 5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。
5月のキーウェストの混雑
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。
ショルダーシーズン天気は平年並みの月(推定)
ピークの混雑混雑ショルダーシーズン閑散
キーウェストの天気が良い月
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)。
天気はまずまずキーウェストの天気は一年を通じて大きく変わりません — どの月も快適さはほぼ一定です。
5月のキーウェストのイベント
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。
- 祭り
Key West Songwriters Festival
4月29日〜5月3日音楽祭Nashville writers play their own hits in bars, theatres and on waterfront stages for five days around the turn of April into May; many shows are free, the bigger ones ticketed. 出典 ↗
近くで開催中のイベント
キーウェストから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。
キーウェストはどこにある?
5月のキーウェスト — よくある質問
- 5月はキーウェストを訪れるのに良い時期ですか?
- キーウェストの5月:猛暑、雨が多い、空気がきれい — 蒸し暑さが気にならなければ悪くない時期。SeasonMapの快適スコアでは、キーウェストの12か月中5位です(85/100)。
- 5月のキーウェストはどんな天気ですか?
- 5月のキーウェストは、平均最高気温30.2°C、最低気温24.1°C、降水量は約103.6 mmで、雨の日はおよそ6.9日です。
- 5月のキーウェストの大気質はどうですか?
- 5月のキーウェストの米国大気質指数(US AQI)は、平均約44です。
300 km圏内:Naples, FloridaのSea turtle nesting(5月1日〜10月31日)、MiamiのSea turtle nesting(3月1日〜10月31日)。