Click on a day for an hourly weather forecast
The temperatures in Trois Rivieres 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 Trois Rivieres 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 Trois Rivieres in September 2025.
If you’re planning to visit Trois Rivieres in the near future, we highly recommend that you review the 14 day weather forecast for Trois Rivieres before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -7° / -15° | 5 | 5 | 22 | 101 mm | Awful | Trois Rivieres in January |
| February | -6° / -14° | 6 | 2 | 22 | 114 mm | Awful | Trois Rivieres in February |
| March | 0° / -8° | 8 | 7 | 17 | 107 mm | Awful | Trois Rivieres in March |
| April | 8° / 0° | 10 | 13 | 7 | 146 mm | Awful | Trois Rivieres in April |
| May | 17° / 7° | 9 | 22 | 0 | 139 mm | Ok | Trois Rivieres in May |
| June | 21° / 11° | 9 | 21 | 0 | 164 mm | Ok | Trois Rivieres in June |
| July | 24° / 14° | 8 | 23 | 0 | 152 mm | Good | Trois Rivieres in July |
| August | 24° / 14° | 7 | 24 | 0 | 165 mm | Good | Trois Rivieres in August |
| September | 20° / 10° | 6 | 24 | 0 | 115 mm | Good | Trois Rivieres in September |
| October | 12° / 5° | 9 | 21 | 1 | 151 mm | Bad | Trois Rivieres in October |
| November | 4° / -1° | 8 | 14 | 8 | 99 mm | Awful | Trois Rivieres in November |
| December | -3° / -9° | 6 | 7 | 18 | 124 mm | Awful | Trois Rivieres in December |