Northwest Territories (Yellowknife)
September
Weather in Northwest Territories for September 2025
Your guide to Northwest Territories weather in September - trends and predictions
In general, the average temperature in Northwest Territories at the beginning of September is 15.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8.4 °C by the end of September.
Northwest Territories sees moderate rainfall in September, averaging 6 rainy days.
Snowfall in Northwest Territories during September is quite rare, with fewer than 2 snowy days on average.
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23
Dry days
6
Rainy days
1
Snow days
15°/7°
Temperatures
23 km/h
Avg max wind
64 %
Avg humidity
Northwest Territories in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2 17° | 3  11° | 4 12° | 5 14° | 6 18° | 7  18° |
| 8 17° | 9 15° | 10  16° | 11 17° | 12 17° | 13 18° | 14 17° |
| 15  17° | 16 17° | 17 16° | 18 15° | 19  11° | 20 11° | 21 13° |
| 22 15° | 23 15° | 24 13° | 25 11° | 26 9° | 27 6° | 28 7° |
| 29  7° | 30 6° |
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Temperatures trend during September in Northwest Territories
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 20° /11° | 1.5 mm | 5 | |
| 2 Sept. | Patchy rain possible | 17° /10° | 1.8 mm | 4 | |
| 3 Sept. | Overcast | 11° /6° | 0.1 mm | 3 | |
| 4 Sept. | Overcast | 12° /5° | 0 mm | 3 | |
| 5 Sept. | Overcast | 14° /4° | 0 mm | 4 | |
| 6 Sept. | Overcast | 18° /8° | 0 mm | 5 | |
| 7 Sept. | Cloudy | 18° /9° | 0 mm | 4 | |
| 8 Sept. | Overcast | 17° /9° | 0 mm | 4 | |
| 9 Sept. | Cloudy | 15° /8° | 5.4 mm | 4 | |
| 10 Sept. | Sunny | 16° /8° | 1.5 mm | 4 | |
| 11 Sept. | Sunny | 17° /8° | 0 mm | 5 | |
| 12 Sept. | Overcast | 17° /10° | 0.1 mm | 4 | |
| 13 Sept. | Overcast | 18° /9° | 0 mm | 5 | |
| 14 Sept. | Cloudy | 17° /9° | 0.1 mm | 4 | |
| 15 Sept. | Partly cloudy | 17° /8° | 0 mm | 5 | |
| 16 Sept. | Partly cloudy | 17° /10° | 0.3 mm | 5 | |
| 17 Sept. | Overcast | 16° /8° | 0 mm | 4 | |
| 18 Sept. | Overcast | 15° /8° | 4.2 mm | 4 | |
| 19 Sept. | Light drizzle | 11° /7° | 0.6 mm | 3 | |
| 20 Sept. | Patchy rain possible | 11° /6° | 0 mm | 3 | |
| 21 Sept. | Overcast | 13° /6° | 0 mm | 4 | |
| 22 Sept. | Partly cloudy | 15° /7° | 0 mm | 5 | |
| 23 Sept. | Sunny | 15° /6° | 0 mm | 5 | |
| 24 Sept. | Light rain shower | 13° /6° | 2.2 mm | 3 | |
| 25 Sept. | Patchy rain possible | 11° /5° | 1 mm | 3 | |
| 26 Sept. | Light rain | 9° /4° | 2.8 mm | 2 | |
| 27 Sept. | Patchy rain possible | 6° /3° | 0.1 mm | 2 | |
| 28 Sept. | Overcast | 7° /2° | 0 mm | 2 | |
| 29 Sept. | Light snow | 7° /2° | 0.2 mm | 2 | |
| 30 Sept. | Overcast | 6° /0° | 0.7 mm | 2 | |
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Important Notice
Our weather forecast for Northwest Territories in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Northwest Territories forecast closer to your planned date for the most up-to-date weather information.
Northwest Territories in September - FAQ
What are the expected maximum and minimum temperatures in Northwest Territories during September?
During September, expect a variety of temperatures with highs around 15° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Northwest Territories during September?
Expect minimal rainfall in Northwest Territories during September, with a total of 17.5 mm over approximately 6 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Northwest Territories during September?
The average wind speed in Northwest Territories during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Northwest Territories
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Where is Northwest Territories?Get accurate weather forecasts for Northwest Territories, located at latitude 62.454 and longitude -114.372. Stay updated with localized weather information tailored for Northwest Territories.
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