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The temperatures in Yellowknife in September are quite cold with temperatures between 5°C and 11°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Yellowknife 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 Yellowknife can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Yellowknife in September 2025.
If you’re planning to visit Yellowknife in the near future, we highly recommend that you review the 14 day weather forecast for Yellowknife before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -20° / -26° | 1 | 9 | 21 | 22 mm | Awful | Yellowknife in January |
| February | -19° / -26° | 1 | 10 | 18 | 14 mm | Awful | Yellowknife in February |
| March | -12° / -19° | 2 | 8 | 21 | 23 mm | Awful | Yellowknife in March |
| April | -3° / -10° | 3 | 10 | 17 | 23 mm | Awful | Yellowknife in April |
| May | 10° / 1° | 3 | 23 | 5 | 32 mm | Bad | Yellowknife in May |
| June | 18° / 9° | 4 | 26 | 0 | 47 mm | Good | Yellowknife in June |
| July | 20° / 12° | 5 | 26 | 0 | 60 mm | Good | Yellowknife in July |
| August | 18° / 10° | 5 | 26 | 0 | 78 mm | Good | Yellowknife in August |
| September | 11° / 5° | 5 | 23 | 2 | 47 mm | Bad | Yellowknife in September |
| October | 1° / -2° | 4 | 11 | 16 | 42 mm | Awful | Yellowknife in October |
| November | -10° / -14° | 2 | 6 | 22 | 33 mm | Awful | Yellowknife in November |
| December | -18° / -23° | 1 | 8 | 22 | 24 mm | Awful | Yellowknife in December |