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Get the Key West FL weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
August is the hottest month in Key West FL, with an average high of 90°F / 32°C; January is the coldest (75°F / 24°C). September is the wettest month, averaging 7.0 in / 177 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 75 / 24 | 65 / 18 | 1.8 / 46 | 5 |
| Feb | 77 / 25 | 67 / 19 | 1.5 / 39 | 4 |
| Mar | 79 / 26 | 69 / 21 | 1.5 / 39 | 4 |
| Apr | 82 / 28 | 73 / 23 | 2.1 / 53 | 4 |
| May | 85 / 30 | 76 / 25 | 3.1 / 79 | 6 |
| Jun | 88 / 31 | 79 / 26 | 4.3 / 108 | 9 |
| Jul | 90 / 32 | 80 / 27 | 3.6 / 92 | 9 |
| Aug | 90 / 32 | 80 / 27 | 5.4 / 136 | 12 |
| Sep | 89 / 31 | 79 / 26 | 7.0 / 177 | 13 |
| Oct | 85 / 30 | 77 / 25 | 5.7 / 144 | 10 |
| Nov | 80 / 27 | 72 / 22 | 2.0 / 52 | 4 |
| Dec | 77 / 25 | 68 / 20 | 2.2 / 55 | 4 |
Extremes since 1948: highest 96°F / 36°C (July 3, 2023), lowest 41°F / 5°C (January 13, 1981).
Daylight lasts about 13.5 hours in June and 10.5 hours in December.
Data: Meteostat — Key West Airport, 1991–2020 averages.
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