Click on a day for an hourly weather forecast
The temperatures in Laval in September are comfortable with low of 12°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Laval 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 Laval in September 2025.
If you’re planning to visit Laval in the near future, we highly recommend that you review the 14 day weather forecast for Laval before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -7° / -13° | 5 | 5 | 21 | 109 mm | Awful | Laval in January |
| February | -5° / -12° | 5 | 4 | 20 | 118 mm | Awful | Laval in February |
| March | 1° / -6° | 8 | 9 | 15 | 108 mm | Awful | Laval in March |
| April | 10° / 2° | 9 | 16 | 5 | 147 mm | Awful | Laval in April |
| May | 18° / 9° | 9 | 22 | 0 | 154 mm | Ok | Laval in May |
| June | 22° / 13° | 7 | 23 | 0 | 156 mm | Ok | Laval in June |
| July | 26° / 16° | 7 | 24 | 0 | 136 mm | Good | Laval in July |
| August | 25° / 16° | 5 | 26 | 0 | 140 mm | Perfect | Laval in August |
| September | 21° / 12° | 6 | 24 | 0 | 114 mm | Good | Laval in September |
| October | 13° / 6° | 8 | 22 | 1 | 151 mm | Bad | Laval in October |
| November | 5° / -1° | 8 | 15 | 7 | 99 mm | Awful | Laval in November |
| December | -2° / -7° | 7 | 8 | 17 | 129 mm | Awful | Laval in December |