La Rochelle weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: July – August
What is the weather like in La Rochelle in September?
In September, La Rochelle is warm: daytime highs average 22 °C, and nights cool down to about 15 °C. The sea averages 18.8 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 52 mm. All in all, September is a so-so month for a holiday in La Rochelle.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 76 | 53 | 14 |
| Day | 24° | 22° | 18° |
| Night | 17° | 15° | 12° |
| Sea | 20° | 19° | 17° |
| Sun | 8 h | 7 h | 5 h |
| Rain days | 7 | 8 | 12 |
More details for September
- Daylight
- 12 h 38 min07:41 – 20:19
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 50 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %52 %
- Seaweight 25 %26 %
- Sunshineweight 20 %72 %
- Few rainy daysweight 20 %71 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
La Rochelle in September: quick answers
Is La Rochelle hot in September?
Warm rather than hot: in September, daytime highs in La Rochelle average 22 °C and nights cool to about 15 °C.
Can you swim in La Rochelle in September?
Only if you don't mind cold water: in September the sea averages just 18.8 °C. Comfortable swimming is possible in August.
Does it rain much in La Rochelle in September?
Rain falls on about 8 days, adding up to 52 mm.
La Rochelle month by month
The whole year in La RochelleAll destinations: FranceWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences