Key West Climate by Month
Key West, Florida, United States
Hot summers and mild winters, with rain spread through the year.
Key West has hot summers and mild winters, with rain spread through the year. Expect highs of 90°F (32°C) in August and 75°F (24°C) in January, with the coldest nights (January) near 64°F (18°C). About 39 in (979 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 90°F(32°C)
- Average high, August
- Coldest nights
- 64°F(18°C)
- Average low, January
- Rain per year
- 39 in(979 mm)
- No clear rainy season
- Humidity
- 74%
- Sunniest: May
Best and worst months in Key West
Best for weatherThe most comfortable weather comes from December to February, with highs around 76°F (25°C) and about 1.8 in (46 mm) of rain a month.
Least pleasantAugust and September are the least pleasant; August is the hottest, with highs of 90°F (32°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in January.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Key West weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuaryBest | 75°F(24°C) | 64°F(18°C) | 2.2 in(56 mm) | 73% | 3.6 |
| FebFebruaryBest | 76°F(25°C) | 65°F(19°C) | 1.4 in(36 mm) | 78% | 4.4 |
| MarMarch | 79°F(26°C) | 68°F(20°C) | 1.4 in(35 mm) | 71% | 5.3 |
| AprApril | 82°F(28°C) | 71°F(22°C) | 2.2 in(56 mm) | 70% | 5.9 |
| MayMay | 85°F(30°C) | 75°F(24°C) | 4.0 in(102 mm) | 71% | 6.1 |
| JunJune | 89°F(31°C) | 78°F(26°C) | 4.9 in(125 mm) | 74% | 5.5 |
| JulJuly | 90°F(32°C) | 80°F(26°C) | 3.3 in(84 mm) | 72% | 5.9 |
| AugAugust | 90°F(32°C) | 80°F(26°C) | 5.5 in(139 mm) | 73% | 5.5 |
| SepSeptember | 89°F(32°C) | 78°F(26°C) | 5.4 in(136 mm) | 74% | 4.8 |
| OctOctober | 85°F(30°C) | 75°F(24°C) | 5.0 in(127 mm) | 76% | 4.2 |
| NovNovember | 80°F(27°C) | 70°F(21°C) | 1.5 in(38 mm) | 74% | 3.9 |
| DecDecemberBest | 77°F(25°C) | 66°F(19°C) | 1.8 in(45 mm) | 76% | 3.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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