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