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The weather in Jasper in September is very cold with temperatures between 2°C and 14°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Jasper. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Please note that Jasper can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Jasper in September 2025.
If you’re planning to visit Jasper in the near future, we highly recommend that you review the 14 day weather forecast for Jasper before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -8° / -17° | 9 | 2 | 22 | 74 mm | Awful | Jasper in January |
| February | -8° / -19° | 9 | 1 | 22 | 61 mm | Awful | Jasper in February |
| March | -1° / -14° | 13 | 2 | 25 | 88 mm | Awful | Jasper in March |
| April | 4° / -9° | 13 | 2 | 19 | 101 mm | Awful | Jasper in April |
| May | 12° / -3° | 13 | 12 | 6 | 126 mm | Awful | Jasper in May |
| June | 15° / 2° | 14 | 16 | 0 | 172 mm | Ok | Jasper in June |
| July | 18° / 5° | 13 | 18 | 0 | 149 mm | Ok | Jasper in July |
| August | 18° / 5° | 9 | 22 | 0 | 100 mm | Ok | Jasper in August |
| September | 14° / 2° | 8 | 20 | 2 | 88 mm | Bad | Jasper in September |
| October | 4° / -5° | 10 | 8 | 13 | 96 mm | Awful | Jasper in October |
| November | -5° / -13° | 9 | 3 | 22 | 99 mm | Awful | Jasper in November |
| December | -10° / -18° | 8 | 3 | 22 | 58 mm | Awful | Jasper in December |