Climate averages 1991–2020
Rouen weather
in September.
A mild, moderately wet month: the 4th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Rouen: daytime highs average 19.7°C and nights cool to about 12.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 52 mm of rain on roughly 9 days, which makes September a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 40 min on an average September day.
The nearest other city in this atlas is Le Havre (72 km away). In September its highs average 19.0°C, 0.7°C cooler than Rouen, with 78 mm of rain.
Among the 57 cities listed in France, Rouen ranks joint 48th of 57 for the warmest September highs and joint 21st of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; Rouen is 1.6°C cooler than that mean.
From September to October, average highs fall by 4.1°C to 15.6°C, and monthly rainfall rises from 52 mm to 72 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
Rouen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.3°C2.5°C | 2.5°C | 63 | 11.8 | 8.79 h |
| February | 8.3°C2.3°C | 2.3°C | 56 | 11.1 | 10.110 h |
| March | 11.3°C4.0°C | 4.0°C | 60 | 11.5 | 11.912 h |
| April | 14.4°C6.0°C | 6.0°C | 62 | 11.3 | 13.714 h |
| May | 17.6°C9.3°C | 9.3°C | 66 | 12.0 | 15.315 h |
| June | 20.6°C12.3°C | 12.3°C | 65 | 11.0 | 16.216 h |
| July | 22.7°C14.4°C | 14.4°C | 59 | 10.9 | 15.816 h |
| August | 22.7°C14.5°C | 14.5°C | 65 | 10.6 | 14.414 h |
| September, selected | 19.7°C12.0°C | 12.0°C | 52 | 9.4 | 12.713 h |
| October | 15.6°C9.4°C | 9.4°C | 72 | 12.3 | 10.811 h |
| November | 10.7°C5.8°C | 5.8°C | 69 | 12.7 | 9.29 h |
| December | 7.7°C3.1°C | 3.1°C | 81 | 13.3 | 8.38 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
- Le Havre in SeptemberFrance · 72 kmHigh 19.0°C · Low 13.4°C · 78 mm rain
- Cergy-Pontoise in SeptemberFrance · 84 kmHigh 20.3°C · Low 12.0°C · 44 mm rain
- Argenteuil in SeptemberFrance · 100 kmHigh 20.6°C · Low 12.1°C · 44 mm rain
- Amiens in SeptemberFrance · 100 kmHigh 19.6°C · Low 11.8°C · 47 mm rain
- Saint-Quentin-en-Yvelines in SeptemberFrance · 100 kmHigh 19.9°C · Low 11.3°C · 48 mm rain
- Versailles in SeptemberFrance · 104 kmHigh 20.0°C · Low 11.6°C · 47 mm rain
- Boulogne-Billancourt in SeptemberFrance · 107 kmHigh 20.7°C · Low 12.3°C · 47 mm rain
- Caen in SeptemberFrance · 110 kmHigh 19.8°C · Low 12.4°C · 53 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 Rouen) is explained once on the Rouen year overview and on the Sources, method and limits page.