Key West weather in December
December in Key West: warm, a little rain, with clean air — a great time to visit.
#12 of 12 months in Key West · #203 of 604 destinations to visit in December · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Key West climate normals — December
| Daytime high | 24°C / 75°F | 🌤 warm |
|---|---|---|
| Nighttime low | 22°C / 72°F | |
| Feels like (high) | 25°C / 77°F | |
| Rainfall | 58 mm / 2.3 in | 🌦 some rain |
| Rainy days | 6 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 19°C / 66°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 10.6 h | |
| Wind | 29 km/h / 18 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Key West in December — FAQ
- Is December a good time to visit Key West?
- December in Key West: warm, a little rain, with clean air — a great time to visit. It ranks #12 of 12 months for Key West on SeasonMap's comfort score (77/100).
- What is the weather like in Key West in December?
- In December, Key West averages a daily high of 24.1°C and a low of 22.4°C, with about 58.2 mm of rain over roughly 6.4 rainy days.
- What is the air quality in Key West in December?
- Key West has a mean US Air Quality Index of about 43 in December.