Click on a day for an hourly weather forecast
The temperatures in St Malo in September are usually low and can range between 13°C and 20°C.
You can expect about 3 to 8 days of rain in St Malo 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 St Malo in September 2025.
If you’re planning to visit St Malo in the near future, we highly recommend that you review the 14 day weather forecast for St Malo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 5° | 10 | 20 | 2 | 113 mm | Awful | St Malo in January |
| February | 9° / 5° | 9 | 17 | 2 | 103 mm | Awful | St Malo in February |
| March | 11° / 5° | 6 | 24 | 1 | 79 mm | Ok | St Malo in March |
| April | 14° / 7° | 5 | 24 | 0 | 76 mm | Good | St Malo in April |
| May | 16° / 9° | 5 | 26 | 0 | 83 mm | Good | St Malo in May |
| June | 19° / 12° | 7 | 23 | 0 | 113 mm | Ok | St Malo in June |
| July | 21° / 14° | 5 | 26 | 0 | 77 mm | Good | St Malo in July |
| August | 21° / 14° | 5 | 26 | 0 | 95 mm | Good | St Malo in August |
| September | 20° / 13° | 4 | 26 | 0 | 65 mm | Good | St Malo in September |
| October | 16° / 11° | 6 | 25 | 0 | 111 mm | Good | St Malo in October |
| November | 12° / 8° | 8 | 22 | 0 | 130 mm | Bad | St Malo in November |
| December | 10° / 6° | 10 | 20 | 1 | 133 mm | Bad | St Malo in December |