Key West, FL Weather
Key West hourly forecast: next 24 hours
Today's high of 86°F (30°C) is right in line with the typical September high of 85°F (29°C).
Current conditions in detail
Key West weather tomorrow (Friday, September 18)
Tomorrow in Key West looks light rain shower, with a high of 86° and an overnight low of 81°. There is a 81% chance of rain - plan accordingly. Winds top out near 17 mph, and the UV index reaches 4 (moderate).
Key West 14-day forecast
About the weather in 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.
Key West weather: 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.
Season by season
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.
Average temperatures in Key West by month
| 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% |