Key West weather in March
March in Key West: warm, dry, with clean air — one of the best months to visit.
#2 of 12 months in Key West · #125 of 604 destinations to visit in March · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Key West climate normals — March
| Daytime high | 25°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 17 mm / 0.7 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 20°C / 67°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 12 h | |
| Wind | 29 km/h / 18 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Key West?
Loading map…
Key West in March — FAQ
- Is March a good time to visit Key West?
- March in Key West: warm, dry, with clean air — one of the best months to visit. It ranks #2 of 12 months for Key West on SeasonMap's comfort score (85/100).
- What is the weather like in Key West in March?
- In March, Key West averages a daily high of 24.6°C and a low of 23.2°C, with about 16.9 mm of rain over roughly 4.2 rainy days.
- What is the air quality in Key West in March?
- Key West has a mean US Air Quality Index of about 48 in March.