Click on a day for an hourly weather forecast
The temperatures in Joliette in September are usually low and can range between 10°C and 19°C.
You can expect about 3 to 8 days of rain in Joliette 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 Joliette in September 2025.
If you’re planning to visit Joliette in the near future, we highly recommend that you review the 14 day weather forecast for Joliette before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -7° / -15° | 9 | 16 | 5 | 27 mm | Awful | Joliette in January |
| February | -5° / -15° | 9 | 13 | 7 | 29 mm | Awful | Joliette in February |
| March | 0° / -9° | 7 | 17 | 7 | 29 mm | Awful | Joliette in March |
| April | 8° / -2° | 7 | 19 | 3 | 44 mm | Bad | Joliette in April |
| May | 17° / 6° | 8 | 23 | 0 | 36 mm | Good | Joliette in May |
| June | 22° / 11° | 8 | 23 | 0 | 46 mm | Good | Joliette in June |
| July | 25° / 14° | 8 | 24 | 0 | 39 mm | Perfect | Joliette in July |
| August | 24° / 14° | 8 | 23 | 0 | 44 mm | Perfect | Joliette in August |
| September | 19° / 10° | 7 | 23 | 0 | 37 mm | Good | Joliette in September |
| October | 12° / 4° | 8 | 22 | 1 | 45 mm | Ok | Joliette in October |
| November | 4° / -3° | 7 | 20 | 3 | 28 mm | Awful | Joliette in November |
| December | -3° / -10° | 10 | 14 | 7 | 37 mm | Awful | Joliette in December |