Key West, FL Climate & Monthly Averages
The climate of Key West
Key West records 136 wet days and 10.8 hours of daily sunshine in an average year. Temperatures follow a tropical wet-and-dry pattern, running 73°F (23°C) in January up to 86°F (30°C) in August.
Climate quick facts
- Hottest month: August - highs near 86°F (30°C)
- Coldest month: January - highs near 73°F (23°C)
- Decade extremes (2015-2024): 89°F (32°C) high · 54°F (12°C) low
- Wettest month: September (19 rainy days) · Sunniest: July (12.2 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 7°C between the average warmest and coolest month · day to night: 2°C
- Average humidity: 78%
Temperatures through the year
Warmth peaks in August: highs of 86°F (30°C), lows of 82°F (28°C). January bottoms out at 73°F (23°C) in daylight, 69°F (20°C) after dark. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 89°F (32°C) and the lowest daily minimum 54°F (12°C). The wettest month is September (6.6 inches (168 mm) across 19 days) and the driest February.
Rain, sun and snow
Between the average August and the average January lie 7°C, a narrower spread than about 81% of the cities we track. July is the brightest month at 12.2 hours of sun a day, against an annual average of 10.8 - sunnier than 91% of the 3496 cities in our dataset.
How Key West compares
- Afternoons run 2°C above the following night - a flatter daily curve than almost every other city we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 73° | 69° | 8 | 1.9 in | 9.4 h/day | 10.8 h | 25% | 78% |
| February | 74° | 70° | 6 | 1.4 in | 10.3 h/day | 11.3 h | 22% | 79% |
| March | 76° | 73° | 4 | 1.5 in | 11.0 h/day | 12.0 h | 15% | 76% |
| April | 78° | 75° | 6 | 1.6 in | 12.1 h/day | 12.7 h | 22% | 76% |
| May | 81° | 78° | 11 | 3.6 in | 12.1 h/day | 13.3 h | 35% | 76% |
| June | 83° | 80° | 16 | 5.5 in | 11.3 h/day | 13.6 h | 54% | 79% |
| July | 85° | 82° | 15 | 3.6 in | 12.2 h/day | 13.5 h | 48% | 77% |
| August | 86° | 82° | 18 | 5.1 in | 11.5 h/day | 13.0 h | 58% | 77% |
| September | 85° | 81° | 19 | 6.6 in | 10.5 h/day | 12.3 h | 64% | 78% |
| October | 82° | 79° | 16 | 5.0 in | 10.0 h/day | 11.5 h | 52% | 77% |
| November | 79° | 76° | 8 | 3.0 in | 9.7 h/day | 10.9 h | 28% | 77% |
| December | 75° | 72° | 7 | 2.6 in | 9.3 h/day | 10.6 h | 24% | 80% |
Key West month by month
Average high and low for each month, with the bar showing where it sits in Key West's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 8 days
- Sunshine
- 9.4 h
- Daylight
- 10.8 h
February
- Rain
- 6 days
- Sunshine
- 10.3 h
- Daylight
- 11.3 h
March
- Rain
- 4 days
- Sunshine
- 11.0 h
- Daylight
- 12.0 h
April
- Rain
- 6 days
- Sunshine
- 12.1 h
- Daylight
- 12.7 h
May
- Rain
- 11 days
- Sunshine
- 12.1 h
- Daylight
- 13.3 h
June
- Rain
- 16 days
- Sunshine
- 11.3 h
- Daylight
- 13.6 h
July
- Rain
- 15 days
- Sunshine
- 12.2 h
- Daylight
- 13.5 h
August
- Rain
- 18 days
- Sunshine
- 11.5 h
- Daylight
- 13.0 h
September
- Rain
- 19 days
- Sunshine
- 10.5 h
- Daylight
- 12.3 h
October
- Rain
- 16 days
- Sunshine
- 10.0 h
- Daylight
- 11.5 h
November
- Rain
- 8 days
- Sunshine
- 9.7 h
- Daylight
- 10.9 h
December
- Rain
- 7 days
- Sunshine
- 9.3 h
- Daylight
- 10.6 h
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
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. Daylight is generous - around 11.7 hours of sun a day.
June through August
Through June through August, Key West is hot: 85°F (29°C) by day, 81°F (27°C) after dark, and rain falls on around 49 of the 90 days. Daylight is generous - around 11.7 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
September through November
September through November runs hot here - highs near 82°F (28°C), nights near 78°F (26°C), and rain falls on around 44 of the 90 days. Daylight is generous - around 10.1 hours of sun a day.
December through February
December through February brings comfortable warmth here - highs near 74°F (23°C), nights near 70°F (21°C), and expect showers on roughly 21 days across the season.
Climate questions, answered
How many rainy days does Key West get in a year?
What should I pack for Key West?
How hot does Key West get in summer?
Is Key West warmer or cooler than most cities?
Best time to visit Key West
December to April is the sweet spot for Key West - warm days, manageable rainfall and plenty of daylight line up. Expect 75°F (24°C) in the afternoon and around 6 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in December.
Pack for Key West with light clothing for the warm months, a compact umbrella or rain shell and moisture-wicking fabrics for the humidity. Note the gap between afternoon and night: August pairs 86°F (30°C) with 82°F (28°C).
Key West temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.