Climate averages 1991–2020
Lille weather
in September.
A mild, moderately wet month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Lille: daytime highs average 19.3°C and nights cool to about 11.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 53 mm of rain on roughly 10 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 41 min on an average September day.
The nearest other city in this atlas is Roubaix (11 km away). In September its highs average 19.2°C, about as warm as Lille, with 54 mm of rain.
Among the 57 cities listed in France, Lille ranks 52nd of 57 for the warmest September highs and joint 23rd of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; Lille is 1.9°C cooler than that mean.
From September to October, average highs fall by 4.2°C to 15.2°C, and monthly rainfall rises from 53 mm to 60 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Lille climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.6°C1.7°C | 1.7°C | 60 | 11.8 | 8.59 h |
| February | 7.7°C1.6°C | 1.6°C | 51 | 10.7 | 10.010 h |
| March | 10.8°C3.2°C | 3.2°C | 51 | 10.7 | 11.812 h |
| April | 14.3°C5.3°C | 5.3°C | 48 | 10.8 | 13.814 h |
| May | 17.6°C8.8°C | 8.8°C | 62 | 11.9 | 15.515 h |
| June | 20.4°C11.8°C | 11.8°C | 60 | 10.4 | 16.416 h |
| July | 22.5°C14.1°C | 14.1°C | 61 | 11.0 | 16.016 h |
| August | 22.5°C14.1°C | 14.1°C | 70 | 11.0 | 14.515 h |
| September, selected | 19.3°C11.6°C | 11.6°C | 53 | 9.9 | 12.713 h |
| October | 15.2°C8.7°C | 8.7°C | 60 | 11.2 | 10.811 h |
| November | 10.3°C5.1°C | 5.1°C | 61 | 12.2 | 9.09 h |
| December | 7.0°C2.4°C | 2.4°C | 70 | 12.5 | 8.18 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Roubaix in SeptemberFrance · 11 kmHigh 19.2°C · Low 11.7°C · 54 mm rain
- Kortrijk in SeptemberBelgium · 26 kmHigh 19.0°C · Low 12.0°C · 54 mm rain
- Brugge in SeptemberBelgium · 65 kmHigh 18.5°C · Low 13.0°C · 62 mm rain
- Dunkirk in SeptemberFrance · 65 kmHigh 18.8°C · Low 12.6°C · 57 mm rain
- Gent in SeptemberBelgium · 66 kmHigh 19.0°C · Low 12.0°C · 56 mm rain
- Mons in SeptemberBelgium · 66 kmHigh 19.1°C · Low 11.6°C · 52 mm rain
- Aalst in SeptemberBelgium · 77 kmHigh 19.2°C · Low 11.9°C · 55 mm rain
- La Louvière in SeptemberBelgium · 82 kmHigh 18.7°C · Low 11.1°C · 54 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lille) is explained once on the Lille year overview and on the Sources, method and limits page.