Lausanne weather in September
September in Lausanne: nice, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Lausanne · #306 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Lausanne in September
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Lausanne climate normals — September
| Daytime high | 20°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 15°C / 58°F | |
| Rainfall | 90 mm / 3.6 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 75% | 💦 very humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 9.3 h/day | |
| Daylight | 12.5 h | |
| Wind | 9 km/h / 5 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Lausanne in September — FAQ
- Is September a good time to visit Lausanne?
- September in Lausanne: nice, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Lausanne on SeasonMap's comfort score (87/100).
- What is the weather like in Lausanne in September?
- In September, Lausanne averages a daily high of 20.4°C and a low of 14.7°C, with about 90.2 mm of rain over roughly 11.4 rainy days.
- What is the air quality in Lausanne in September?
- Lausanne has a mean US Air Quality Index of about 38 in September.