Click on a day for an hourly weather forecast
The temperatures in La Rochelle in September are comfortable with low of 15°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in La Rochelle during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in La Rochelle in September 2025.
If you’re planning to visit La Rochelle in the near future, we highly recommend that you review the 14 day weather forecast for La Rochelle before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 6° | 8 | 22 | 1 | 118 mm | Bad | La Rochelle in January |
| February | 10° / 5° | 7 | 20 | 1 | 96 mm | Bad | La Rochelle in February |
| March | 13° / 7° | 5 | 25 | 0 | 74 mm | Ok | La Rochelle in March |
| April | 15° / 9° | 4 | 26 | 0 | 66 mm | Good | La Rochelle in April |
| May | 18° / 12° | 6 | 25 | 0 | 83 mm | Good | La Rochelle in May |
| June | 21° / 15° | 5 | 25 | 0 | 91 mm | Good | La Rochelle in June |
| July | 23° / 17° | 4 | 27 | 0 | 63 mm | Perfect | La Rochelle in July |
| August | 23° / 17° | 3 | 28 | 0 | 58 mm | Perfect | La Rochelle in August |
| September | 22° / 15° | 4 | 26 | 0 | 66 mm | Good | La Rochelle in September |
| October | 18° / 13° | 6 | 25 | 0 | 103 mm | Good | La Rochelle in October |
| November | 14° / 10° | 7 | 23 | 0 | 146 mm | Ok | La Rochelle in November |
| December | 11° / 7° | 9 | 21 | 1 | 141 mm | Bad | La Rochelle in December |