Vejret i Key West i september

Key West i september: trykkende hedt, gennemblødt, med ren luft — fint, hvis du kan klare 13 regnvejrsdage.

Opdateret september 2026 · klimanormaler fra ERA5-reanalysen

Key West🇺🇸 United States · Florida · Strand76
  1. 84jan.
  2. 89feb.
  3. 91mar.
  4. 90apr.
  5. 85maj
  6. 82jun.
  7. 80jul.
  8. 78aug.
  9. 76sep.
  10. 81okt.
  11. 86nov.
  12. 83dec.

Nr. 12 af 12 måneder i Key West · Nr. 824 af 1413 rejsemål at besøge i september · komfort 76/100 (niveau B)

Dage
32°C
Nætter
26°C
Våde dage
13
Sol
10.3 h
Luftfugtighed
79%
Dagslys
12 h
Key West, United States
Foto: Arian Fernandez · Pexels

Noter fra rejsende om Key West i september

Forum posters call September hot, humid and rainy, sitting right at the peak of hurricane season (which runs June-November, peaking late August into late September) - but they're consistent that actual disruption is rare. One repeat visitor of twenty consecutive Septembers reported being foiled by a hurricane only twice. The standard advice is simply to buy trip insurance and follow evacuation guidance if a storm does approach, not to avoid the month outright. The clear payoff for the hurricane-season gamble: genuine off-season pricing and noticeably lighter weekday crowds compared to the winter high season.
Tripadvisor community · september · for 5 dage siden · Læs mere på Tripadvisor ↗

Andre måneder i Key West

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.
ColdFrontsBringAFewChillyWindyDays · januar · for 3 dage siden · Læs mere på Tripadvisor ↗
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.
WindsDieDownBeforeTheHeatArrives · maj · for 3 dage siden · Læs mere på Tripadvisor ↗
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.
DuvalStreetNovemberRegular · november · for 3 dage siden · Læs mere på Tripadvisor ↗
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.
WindyEnoughToSkipTheFerry · februar · for 3 dage siden · Læs mere på Tripadvisor ↗

Tilføj din egen note fra Key West på kortet.

Klimanormaler for Key West — september

Dagtemperatur32°C / 89°F🔥 trykkende hedt
Nattemperatur26°C / 78°F
Føles som (dag)37°C / 99°F
Havtemperatur31°C / 88°F♨️ badevandsvarmt
Nedbør195 mm / 7.7 in⛈ gennemblødt
Regnvejrsdage13 dage
Luftfugtighed79 %💦 meget fugtigt
Dugpunkt24°C / 76°F
Solskin10.3 t/dag
Dagslys12.3 t
Vind23 km/t / 14 mph
Luftkvalitet (US AQI)35🍃 god

Månedsgennemsnit fra ERA5-reanalysen. AQI er det gennemsnitlige amerikanske luftkvalitetsindeks for måneden.

Travlhed i Key West i september

Hvor travlt der er på selve stedet — skoleferier og masseferier, de måneder en redaktør har markeret, og hvor eftertragtet vejret gør dem. Aldrig en del af komfortscoren.

TravltSummer break i United States(anslået)

JFMAMJJASOND

TætpakketTravltSkuldersæsonStille

Bedste måneder for vejret i Key West

Rangeret efter dette rejsemåls egen klimakomfortscore året igennem — noget andet end, hvor travlt der bliver (se Travlhed ovenfor).

Pænt vejrVejret i Key West svinger ikke meget året igennem — komforten holder sig nogenlunde stabil hver måned.

JFMAMJJASOND

Det sker i Key West i september

Tilbagevendende sæsonbegivenheder, naturfænomener, lukninger og helligdage — kurateret og med kilder.

  • Risiko

    Hurricane season

    1. jun. – 30. nov.

    The island is four feet above the sea at the highest and reached by one road with forty-two bridges, so evacuation is ordered early and the Overseas Highway closes long before landfall. September is the peak. Kilde ↗

Det sker rundt om i verden i september →

Lige i nærheden sker der noget

Inden for 300 km fra Key West — en dagstur eller et kort hop — hvor der sker noget denne måned. Aldrig en del af komfortscoren.

Hvor ligger Key West?

Indlæser kort…

Key West i september — ofte stillede spørgsmål

Er september et godt tidspunkt at besøge Key West?
Key West i september: trykkende hedt, gennemblødt, med ren luft — fint, hvis du kan klare 13 regnvejrsdage. Måneden ligger nr. 12 ud af 12 for Key West på SeasonMaps komfortscore (76/100).
Hvordan er vejret i Key West i september?
I september har Key West i gennemsnit en dagtemperatur på 31.5 °C og en nattemperatur på 25.5 °C, med omkring 195.3 mm regn fordelt på cirka 12.7 regnvejrsdage.
Hvordan er luftkvaliteten i Key West i september?
Key West har et gennemsnitligt amerikansk luftkvalitetsindeks på omkring 35 i september.

Inden for 300 km: Naples, Florida's Sea turtle nesting, 1. maj – 31. okt. og Miami's Sea turtle nesting, 1. mar. – 31. okt..

Vejret i Key West i september: 32 °C, 13 regnvejrsdage, 10 t sol | SeasonMap