Key West weather in December
December in Key West: warm, a little rain, with clean air — an excellent time to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#7 of 12 months in Key West · #371 of 1413 destinations to visit in December · comfort 83/100 (tier A)
- Days
- 26°C
- Nights
- 20°C
- Wet days
- 5
- Sun
- 8.9 h
- Humidity
- 78%
- Daylight
- 11 h

Traveller notes on Key West in December
Notes from nearby Everglades National Park (128 km away)
Key West doesn't have its own notes for December yet — these are about Everglades National Park, close enough to share the season.
Everglades-forum threads on the best time of year consistently point to December through March, and posters call December specifically the start of the reliably dry-season stretch, comfortable, breezy conditions replacing summer's oppressive heat and near-daily storms. Regulars describe wildlife viewing as genuinely stronger this time of year, lower water levels concentrating alligators, crocodiles and wading birds around the remaining pools rather than scattering them across the flooded high-water landscape. Mosquito pressure is called dramatically lower than the warmer months, a real quality-of-life difference for anyone hiking the boardwalk trails. Posters name Anhinga Trail and Shark Valley as the standout December picks for reliable, close-up wildlife sightings. Regulars call the crisp light this month a genuine bonus for photography. The record: 26.2C days feeling like 27C, 17.3C nights, a low 76 percent humidity and 10.5 hours of daylight.
Other months in 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.
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.
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.
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Key West climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Key West in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsChristmas and New Year, Winter / Christmas break in United States, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Key West's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherKey West's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Key West in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Holiday
Christmas and New Year
20 Dec – 3 JanChristmas & New YearCrowdedBook earlyThe start of the winter high season and the fortnight the island charges the most. New Year's Eve is marked by several competing drops on Duval rather than one, which tells you most of what you need to know. Source ↗
Nearby, and something's on
Within 300 km of Key West — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Key West?
Key West in December — FAQ
- Is December a good time to visit Key West?
- December in Key West: warm, a little rain, with clean air — an excellent time to visit. It ranks #7 of 12 months for Key West on SeasonMap's comfort score (83/100).
- What is the weather like in Key West in December?
- In December, Key West averages a daily high of 25.6°C and a low of 19.8°C, with about 65.4 mm of rain over roughly 4.8 rainy days.
- What is the air quality in Key West in December?
- Key West has a mean US Air Quality Index of about 43 in December.
Within 300 km: Everglades National Park's Wading bird nesting around 1 Dec – 15 Apr, and Havana's Havana Film Festival on 3–13 Dec.