Geneva weather in September
September in Geneva: nice, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Geneva · #217 of 604 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Geneva climate normals — September
| Daytime high | 21°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 103 mm / 4.1 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 12.5 h | |
| Wind | 9 km/h / 6 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Geneva in September — FAQ
- Is September a good time to visit Geneva?
- September in Geneva: nice, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Geneva on SeasonMap's comfort score (84/100).
- What is the weather like in Geneva in September?
- In September, Geneva averages a daily high of 21.4°C and a low of 13°C, with about 103.2 mm of rain over roughly 11.2 rainy days.
- What is the air quality in Geneva in September?
- Geneva has a mean US Air Quality Index of about 39 in September.