Click on a day for an hourly weather forecast
The weather in Banff in September is very cold with temperatures between 2°C and 10°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Banff 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.
Please note that Banff can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Banff in September 2025.
If you’re planning to visit Banff in the near future, we highly recommend that you review the 14 day weather forecast for Banff before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -8° / -16° | 11 | 2 | 21 | 44 mm | Awful | Banff in January |
| February | -8° / -17° | 10 | 1 | 22 | 49 mm | Awful | Banff in February |
| March | -3° / -11° | 12 | 1 | 25 | 80 mm | Awful | Banff in March |
| April | 1° / -6° | 11 | 2 | 21 | 127 mm | Awful | Banff in April |
| May | 7° / 0° | 15 | 8 | 9 | 180 mm | Awful | Banff in May |
| June | 12° / 5° | 16 | 13 | 1 | 232 mm | Bad | Banff in June |
| July | 16° / 8° | 13 | 18 | 0 | 162 mm | Ok | Banff in July |
| August | 15° / 8° | 9 | 22 | 0 | 118 mm | Ok | Banff in August |
| September | 10° / 2° | 7 | 20 | 2 | 83 mm | Awful | Banff in September |
| October | 1° / -6° | 9 | 8 | 14 | 75 mm | Awful | Banff in October |
| November | -5° / -13° | 11 | 2 | 21 | 73 mm | Awful | Banff in November |
| December | -10° / -18° | 10 | 3 | 22 | 51 mm | Awful | Banff in December |