Lille weather in September
September in Lille: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Lille · #254 of 897 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Lille in September
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Lille climate normals — September
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Rainfall | 56 mm / 2.2 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 8.7 h/day | |
| Daylight | 12.6 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Lille in September — FAQ
- Is September a good time to visit Lille?
- September in Lille: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Lille on SeasonMap's comfort score (88/100).
- What is the weather like in Lille in September?
- In September, Lille averages a daily high of 21.1°C and a low of 12.7°C, with about 56.2 mm of rain over roughly 9.4 rainy days.
- What is the air quality in Lille in September?
- Lille has a mean US Air Quality Index of about 42 in September.