Climate averages 1991–2020
La Rochelle weather
in September.
A mild, moderately wet month: the 4th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in La Rochelle: daytime highs average 21.6°C and nights cool to about 14.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 55 mm of rain on roughly 8 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Nantes (121 km away). In September its highs average 21.3°C, about as warm as La Rochelle, with 49 mm of rain.
Among the 57 cities listed in France, La Rochelle ranks joint 19th of 57 for the warmest September highs and joint 27th of 57 for the driest September (rainfall, lowest first). The mean September high of those 57 cities is 21.3°C; La Rochelle is 0.3°C warmer than that mean.
From September to October, average highs fall by 4.0°C to 17.5°C, and monthly rainfall rises from 55 mm to 87 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
La Rochelle climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.3°C4.5°C | 4.5°C | 77 | 11.9 | 9.19 h |
| February | 10.0°C4.2°C | 4.2°C | 58 | 9.8 | 10.310 h |
| March | 12.8°C6.3°C | 6.3°C | 54 | 10.0 | 11.912 h |
| April | 15.2°C8.4°C | 8.4°C | 57 | 9.8 | 13.514 h |
| May | 18.7°C11.8°C | 11.8°C | 57 | 10.2 | 14.915 h |
| June | 21.8°C14.9°C | 14.9°C | 47 | 8.4 | 15.716 h |
| July | 23.7°C16.7°C | 16.7°C | 36 | 7.1 | 15.415 h |
| August | 24.1°C16.9°C | 16.9°C | 42 | 7.2 | 14.214 h |
| September, selected | 21.6°C14.4°C | 14.4°C | 55 | 8.0 | 12.613 h |
| October | 17.5°C11.7°C | 11.7°C | 87 | 12.3 | 11.011 h |
| November | 12.8°C7.7°C | 7.7°C | 92 | 12.8 | 9.59 h |
| December | 9.9°C5.1°C | 5.1°C | 87 | 12.8 | 8.79 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
- Nantes in SeptemberFrance · 121 kmHigh 21.3°C · Low 13.0°C · 49 mm rain
- Poitiers in SeptemberFrance · 124 kmHigh 21.7°C · Low 12.6°C · 50 mm rain
- Angers in SeptemberFrance · 152 kmHigh 21.3°C · Low 12.6°C · 50 mm rain
- Bordeaux in SeptemberFrance · 154 kmHigh 23.8°C · Low 13.9°C · 58 mm rain
- Limoges in SeptemberFrance · 189 kmHigh 20.5°C · Low 12.0°C · 78 mm rain
- Tours in SeptemberFrance · 197 kmHigh 21.6°C · Low 12.8°C · 49 mm rain
- Rennes in SeptemberFrance · 220 kmHigh 20.5°C · Low 12.2°C · 49 mm rain
- Le Mans in SeptemberFrance · 229 kmHigh 20.8°C · Low 12.2°C · 51 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 La Rochelle) is explained once on the La Rochelle year overview and on the Sources, method and limits page.