Click on a day for an hourly weather forecast
The temperatures in Saint Brieuc in September are usually low and can range between 12°C and 19°C.
You can expect about 3 to 8 days of rain in Saint Brieuc 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 Saint Brieuc in September 2026.
If you’re planning to visit Saint Brieuc in the near future, we highly recommend that you review the 14 day weather forecast for Saint Brieuc before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 8 | 21 | 2 | 85 mm | Awful | Saint Brieuc in January |
| February | 9° / 4° | 8 | 18 | 3 | 81 mm | Awful | Saint Brieuc in February |
| March | 11° / 5° | 5 | 25 | 1 | 55 mm | Ok | Saint Brieuc in March |
| April | 13° / 6° | 5 | 25 | 1 | 66 mm | Ok | Saint Brieuc in April |
| May | 16° / 8° | 4 | 27 | 0 | 56 mm | Good | Saint Brieuc in May |
| June | 18° / 11° | 6 | 24 | 0 | 86 mm | Good | Saint Brieuc in June |
| July | 20° / 13° | 4 | 27 | 0 | 61 mm | Good | Saint Brieuc in July |
| August | 21° / 13° | 5 | 26 | 0 | 80 mm | Good | Saint Brieuc in August |
| September | 19° / 12° | 4 | 26 | 0 | 49 mm | Good | Saint Brieuc in September |
| October | 16° / 10° | 6 | 25 | 0 | 86 mm | Good | Saint Brieuc in October |
| November | 12° / 8° | 7 | 23 | 0 | 93 mm | Bad | Saint Brieuc in November |
| December | 10° / 6° | 8 | 21 | 1 | 97 mm | Bad | Saint Brieuc in December |