Annecy weather in September
September in Annecy: nice, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Annecy · #189 of 897 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Annecy in September
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Annecy climate normals — September
| Daytime high | 22°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Rainfall | 110 mm / 4.3 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 12.5 h | |
| Wind | 7 km/h / 5 mph | |
| Snowfall | 0.9 cm / 0.4 in | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Annecy in September — FAQ
- Is September a good time to visit Annecy?
- September in Annecy: nice, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Annecy on SeasonMap's comfort score (89/100).
- What is the weather like in Annecy in September?
- In September, Annecy averages a daily high of 21.5°C and a low of 12.7°C, with about 109.8 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Annecy in September?
- Annecy has a mean US Air Quality Index of about 40 in September.