Lyon weather in September
September in Lyon: warm, rainy, with clean air — one of the best months to visit.
#1 of 12 months in Lyon · #70 of 604 destinations to visit in September · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Lyon climate normals — September
| Daytime high | 24°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 15°C / 58°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 80 mm / 3.2 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 70% | 💧 humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 10 h/day | |
| Daylight | 12.5 h | |
| Wind | 13 km/h / 8 mph | |
| 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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Lyon in September — FAQ
- Is September a good time to visit Lyon?
- September in Lyon: warm, rainy, with clean air — one of the best months to visit. It ranks #1 of 12 months for Lyon on SeasonMap's comfort score (90/100).
- What is the weather like in Lyon in September?
- In September, Lyon averages a daily high of 24.4°C and a low of 14.5°C, with about 80.1 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Lyon in September?
- Lyon has a mean US Air Quality Index of about 40 in September.