Zürich weather in September
September in Zürich: nice, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Zürich · #255 of 604 destinations to visit in September · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Zürich climate normals — September
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 20°C / 68°F | |
| Rainfall | 97 mm / 3.8 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 12°C / 54°F | |
| Sunshine | 9.3 h/day | |
| Daylight | 12.6 h | |
| Wind | 9 km/h / 5 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Zürich in September — FAQ
- Is September a good time to visit Zürich?
- September in Zürich: nice, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Zürich on SeasonMap's comfort score (83/100).
- What is the weather like in Zürich in September?
- In September, Zürich averages a daily high of 20.2°C and a low of 12.3°C, with about 96.9 mm of rain over roughly 11.6 rainy days.
- What is the air quality in Zürich in September?
- Zürich has a mean US Air Quality Index of about 50 in September.