Click on a day for an hourly weather forecast
The temperatures in Shawinigan in September are usually low and can range between 10°C and 20°C.
You can expect about 3 to 8 days of rain in Shawinigan 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 Shawinigan in September 2025.
If you’re planning to visit Shawinigan in the near future, we highly recommend that you review the 14 day weather forecast for Shawinigan before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -7° / -15° | 5 | 5 | 22 | 101 mm | Awful | Shawinigan in January |
| February | -6° / -14° | 6 | 2 | 22 | 114 mm | Awful | Shawinigan in February |
| March | 0° / -8° | 8 | 7 | 17 | 107 mm | Awful | Shawinigan in March |
| April | 8° / 0° | 10 | 13 | 7 | 146 mm | Awful | Shawinigan in April |
| May | 17° / 7° | 9 | 22 | 0 | 139 mm | Ok | Shawinigan in May |
| June | 21° / 11° | 9 | 21 | 0 | 154 mm | Ok | Shawinigan in June |
| July | 24° / 14° | 8 | 23 | 0 | 143 mm | Good | Shawinigan in July |
| August | 24° / 14° | 7 | 25 | 0 | 155 mm | Good | Shawinigan in August |
| September | 20° / 10° | 6 | 24 | 0 | 110 mm | Good | Shawinigan in September |
| October | 12° / 5° | 9 | 22 | 1 | 141 mm | Bad | Shawinigan in October |
| November | 4° / -1° | 8 | 15 | 8 | 94 mm | Awful | Shawinigan in November |
| December | -3° / -9° | 6 | 7 | 18 | 124 mm | Awful | Shawinigan in December |