Click on a day for an hourly weather forecast
The temperatures in Thetford Mines in September are quite cold with temperatures between 8°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Thetford Mines 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 Thetford Mines in September 2025.
If you’re planning to visit Thetford Mines in the near future, we highly recommend that you review the 14 day weather forecast for Thetford Mines before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -8° / -15° | 3 | 3 | 25 | 131 mm | Awful | Thetford Mines in January |
| February | -6° / -15° | 3 | 2 | 25 | 137 mm | Awful | Thetford Mines in February |
| March | -1° / -9° | 7 | 3 | 22 | 139 mm | Awful | Thetford Mines in March |
| April | 7° / -2° | 9 | 6 | 15 | 164 mm | Awful | Thetford Mines in April |
| May | 16° / 5° | 10 | 20 | 2 | 177 mm | Bad | Thetford Mines in May |
| June | 20° / 10° | 11 | 19 | 0 | 185 mm | Ok | Thetford Mines in June |
| July | 23° / 13° | 10 | 21 | 0 | 188 mm | Good | Thetford Mines in July |
| August | 23° / 12° | 9 | 22 | 0 | 194 mm | Good | Thetford Mines in August |
| September | 19° / 8° | 7 | 23 | 0 | 145 mm | Ok | Thetford Mines in September |
| October | 11° / 3° | 11 | 16 | 5 | 175 mm | Awful | Thetford Mines in October |
| November | 3° / -4° | 9 | 7 | 15 | 142 mm | Awful | Thetford Mines in November |
| December | -4° / -10° | 5 | 2 | 24 | 154 mm | Awful | Thetford Mines in December |