Basel weather in May
May in Basel: nice, rainy, with clean air — an excellent time to visit.
#5 of 12 months in Basel · #255 of 604 destinations to visit in May · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Basel climate normals — May
| Daytime high | 18°C / 65°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 47°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 110 mm / 4.3 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 10°C / 51°F | |
| Sunshine | 10.5 h/day | |
| Daylight | 15.1 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 0.8 cm / 0.3 in | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Basel in May — FAQ
- Is May a good time to visit Basel?
- May in Basel: nice, rainy, with clean air — an excellent time to visit. It ranks #5 of 12 months for Basel on SeasonMap's comfort score (83/100).
- What is the weather like in Basel in May?
- In May, Basel averages a daily high of 18.4°C and a low of 8.5°C, with about 109.7 mm of rain over roughly 15.2 rainy days.
- What is the air quality in Basel in May?
- Basel has a mean US Air Quality Index of about 48 in May.