Click on a day for an hourly weather forecast
The temperatures in Calgary in September are quite cold with temperatures between 7°C and 19°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Calgary 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 Calgary can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Calgary in September 2025.
If you’re planning to visit Calgary in the near future, we highly recommend that you review the 14 day weather forecast for Calgary before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -11° | 4 | 13 | 15 | 21 mm | Awful | Calgary in January |
| February | -4° / -12° | 3 | 8 | 17 | 24 mm | Awful | Calgary in February |
| March | 2° / -6° | 4 | 12 | 15 | 31 mm | Awful | Calgary in March |
| April | 8° / -1° | 5 | 13 | 13 | 57 mm | Bad | Calgary in April |
| May | 15° / 5° | 7 | 21 | 3 | 80 mm | Bad | Calgary in May |
| June | 20° / 9° | 11 | 19 | 0 | 128 mm | Ok | Calgary in June |
| July | 23° / 11° | 8 | 23 | 0 | 93 mm | Good | Calgary in July |
| August | 23° / 10° | 5 | 26 | 0 | 66 mm | Perfect | Calgary in August |
| September | 19° / 7° | 3 | 25 | 2 | 38 mm | Ok | Calgary in September |
| October | 10° / 1° | 3 | 21 | 7 | 28 mm | Bad | Calgary in October |
| November | 1° / -6° | 2 | 15 | 12 | 23 mm | Awful | Calgary in November |
| December | -5° / -11° | 3 | 13 | 15 | 28 mm | Awful | Calgary in December |