Climate averages 1991–2020
Roubaix weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Roubaix: daytime highs average 19.2°C and nights cool to about 11.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 54 mm of rain on roughly 10 days, which makes September a moderately wet month (the joint 3rd 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 Lille (11 km away). In September its highs average 19.3°C, about as warm as Roubaix, with 53 mm of rain.
Among the 57 cities listed in France, Roubaix ranks 53rd of 57 for the warmest September highs and 26th of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; Roubaix is 2.1°C cooler than that mean.
From September to October, average highs fall by 4.2°C to 15.0°C, and monthly rainfall rises from 54 mm to 62 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
Roubaix climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.5°C1.6°C | 1.6°C | 64 | 12.1 | 8.59 h |
| February | 7.5°C1.6°C | 1.6°C | 54 | 11.2 | 10.010 h |
| March | 10.7°C3.2°C | 3.2°C | 53 | 11.4 | 11.812 h |
| April | 14.2°C5.3°C | 5.3°C | 47 | 11.1 | 13.814 h |
| May | 17.5°C8.9°C | 8.9°C | 62 | 11.8 | 15.515 h |
| June | 20.3°C11.8°C | 11.8°C | 61 | 10.7 | 16.416 h |
| July | 22.4°C14.1°C | 14.1°C | 65 | 11.2 | 16.016 h |
| August | 22.3°C14.1°C | 14.1°C | 72 | 11.3 | 14.515 h |
| September, selected | 19.2°C11.7°C | 11.7°C | 54 | 10.2 | 12.713 h |
| October | 15.0°C8.7°C | 8.7°C | 62 | 11.2 | 10.811 h |
| November | 10.1°C5.1°C | 5.1°C | 65 | 12.5 | 9.09 h |
| December | 6.9°C2.4°C | 2.4°C | 74 | 12.9 | 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
- Lille in SeptemberFrance · 11 kmHigh 19.3°C · Low 11.6°C · 53 mm rain
- Kortrijk in SeptemberBelgium · 16 kmHigh 19.0°C · Low 12.0°C · 54 mm rain
- Gent in SeptemberBelgium · 55 kmHigh 19.0°C · Low 12.0°C · 56 mm rain
- Brugge in SeptemberBelgium · 57 kmHigh 18.5°C · Low 13.0°C · 62 mm rain
- Mons in SeptemberBelgium · 61 kmHigh 19.1°C · Low 11.6°C · 52 mm rain
- Aalst in SeptemberBelgium · 66 kmHigh 19.2°C · Low 11.9°C · 55 mm rain
- Dunkirk in SeptemberFrance · 68 kmHigh 18.8°C · Low 12.6°C · 57 mm rain
- La Louvière in SeptemberBelgium · 75 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 Roubaix) is explained once on the Roubaix year overview and on the Sources, method and limits page.
Kortrijk lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.