Key West, FL Climate & Monthly Averages
The climate of Key West
Weather in Key West is shaped by its tropical wet-and-dry climate - expect year-round warmth split between a rainy season and a pronounced dry season. August afternoons typically reach 86°F (30°C), while January highs hover near 73°F (23°C). Annual precipitation averages 41.4 inches (1052 mm) over about 136 rainy days.
Climate quick facts
- Hottest month: August - highs near 86°F (30°C)
- Coldest month: January - highs near 73°F (23°C)
- Record high: 89°F (32°C) · Record low: 54°F (12°C) (2015–2024)
- Wettest month: September (19 rainy days) · Sunniest: July (12.2 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 86°F (30°C) and overnight lows stay near 82°F (28°C). The coolest month is January, with typical highs of 73°F (23°C) and lows around 69°F (20°C). Based on 2015–2024 weather data, temperatures have reached as high as 89°F (32°C) and dropped as low as 54°F (12°C).
Rain, sun and snow
September is usually the wettest month. It brings about 6.6 inches (168 mm) of rain over 19 days, while February is the driest. July brings the most sunshine, averaging 12.2 hours of sun a day.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 73° | 69° | 8 | 1.9 in | 9.4 h/day | 78% |
| February | 74° | 70° | 6 | 1.4 in | 10.3 h/day | 79% |
| March | 76° | 73° | 4 | 1.5 in | 11.0 h/day | 76% |
| April | 78° | 75° | 6 | 1.6 in | 12.1 h/day | 76% |
| May | 81° | 78° | 11 | 3.6 in | 12.1 h/day | 76% |
| June | 83° | 80° | 16 | 5.5 in | 11.3 h/day | 79% |
| July | 85° | 82° | 15 | 3.6 in | 12.2 h/day | 77% |
| August | 86° | 82° | 18 | 5.1 in | 11.5 h/day | 77% |
| September | 85° | 81° | 19 | 6.6 in | 10.5 h/day | 78% |
| October | 82° | 79° | 16 | 5.0 in | 10.0 h/day | 77% |
| November | 79° | 76° | 8 | 3.0 in | 9.7 h/day | 77% |
| December | 75° | 72° | 7 | 2.6 in | 9.3 h/day | 80% |
Key West month by month
Key West weather in January
January brings highs around 73°F (23°C), lows near 69°F (20°C), about 8 wet days - typically the coldest month of the year in Key West.
Key West weather in February
February brings highs around 74°F (23°C), lows near 70°F (21°C), about 6 wet days - typically the driest month of the year in Key West.
Key West weather in March
March brings highs around 76°F (24°C), lows near 73°F (23°C), about 4 wet days.
Key West weather in April
April brings highs around 78°F (26°C), lows near 75°F (24°C), about 6 wet days.
Key West weather in May
May brings highs around 81°F (27°C), lows near 78°F (25°C), about 11 wet days.
Key West weather in June
June brings highs around 83°F (29°C), lows near 80°F (27°C), about 16 wet days.
Key West weather in July
July brings highs around 85°F (30°C), lows near 82°F (28°C), about 15 wet days - typically the sunniest month of the year in Key West.
Key West weather in August
August brings highs around 86°F (30°C), lows near 82°F (28°C), about 18 wet days - typically the hottest month of the year in Key West.
Key West weather in September
September brings highs around 85°F (29°C), lows near 81°F (27°C), about 19 wet days - typically the wettest month of the year in Key West.
Key West weather in October
October brings highs around 82°F (28°C), lows near 79°F (26°C), about 16 wet days.
Key West weather in November
November brings highs around 79°F (26°C), lows near 76°F (24°C), about 8 wet days.
Key West weather in December
December brings highs around 75°F (24°C), lows near 72°F (22°C), about 7 wet days.
Seasons in Key West
March through May
March through May in Key West is mild and warm, with daytime highs averaging 78°F (26°C) and nights around 75°F (24°C); expect showers on roughly 22 days across the season.
June through August
June through August in Key West brings hot afternoons, with daytime highs averaging 85°F (29°C) and nights around 81°F (27°C); expect showers on roughly 49 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
September through November
September through November in Key West is hot, with daytime highs averaging 82°F (28°C) and nights around 78°F (26°C); expect showers on roughly 44 days across the season.
December through February
December through February in Key West brings comfortable warmth, with daytime highs averaging 74°F (23°C) and nights around 70°F (21°C); expect showers on roughly 21 days across the season.
Climate questions, answered
What is the average temperature in Key West?
Is Key West hot in summer?
Is Key West cold in winter?
How many rainy days does Key West get in a year?
Best time to visit Key West
The best time to visit Key West is generally December to April, when these months combine the driest skies with the most comfortable heat. Daytime temperatures in that window typically sit near 75°F (24°C).
Pack for Key West with a compact umbrella or rain shell - showers are a regular feature; moisture-wicking fabrics to cope with the humidity. Evenings can feel noticeably cooler than afternoons - August nights average 82°F (28°C).
Key West temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.