Key West weather in May
May in Key West: hot, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Key West · #263 of 604 destinations to visit in May · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Key West climate normals — May
| Daytime high | 27°C / 81°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Feels like (high) | 31°C / 88°F | |
| Rainfall | 90 mm / 3.5 in | 🌧 rainy |
| Rainy days | 8 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 22°C / 71°F | |
| Sunshine | 12 h/day | |
| Daylight | 13.3 h | |
| Wind | 25 km/h / 16 mph | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Key West in May — FAQ
- Is May a good time to visit Key West?
- May in Key West: hot, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Key West on SeasonMap's comfort score (83/100).
- What is the weather like in Key West in May?
- In May, Key West averages a daily high of 27.1°C and a low of 25.5°C, with about 89.6 mm of rain over roughly 8.2 rainy days.
- What is the air quality in Key West in May?
- Key West has a mean US Air Quality Index of about 44 in May.