Key West weather in August
August in Key West: sweltering, rainy, with clean air — an excellent time to visit.
#8 of 12 months in Key West · #250 of 604 destinations to visit in August · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Key West climate normals — August
| Daytime high | 30°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 28°C / 82°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 105 mm / 4.1 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 25°C / 76°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 13 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 46 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Key West in August — FAQ
- Is August a good time to visit Key West?
- August in Key West: sweltering, rainy, with clean air — an excellent time to visit. It ranks #8 of 12 months for Key West on SeasonMap's comfort score (82/100).
- What is the weather like in Key West in August?
- In August, Key West averages a daily high of 29.6°C and a low of 27.9°C, with about 104.7 mm of rain over roughly 15.2 rainy days.
- What is the air quality in Key West in August?
- Key West has a mean US Air Quality Index of about 46 in August.