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Yellowknife
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Weather in Yellowknife for September 2025

Your guide to Yellowknife weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Air Quality Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Yellowknife has been nearly identical to the historical average, with a temperature of 15.9 °C (showing only a slight deviation of -0.2 °C).

  • Expect cooler weather in the next days in Yellowknife with the forecast suggesting a temperature of 14.9 °C, lower than the historical average.

  • In general, the average temperature in Yellowknife at the beginning of September is 15.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 9.1 °C by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Yellowknife experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/5°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
66 %
Avg humidity

Yellowknife Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
18°
2
Patchy rain possible
16°
3
Overcast
13°
4
Overcast
12°
5
Overcast
14°
6
Partly cloudy
18°
7
Cloudy
17°
8
Overcast
16°
9
Cloudy
17°
10
Sunny
15°
11
Sunny
18°
12
Overcast
19°
13
Overcast
19°
14
Weather Alert Patchy rain possible
20°
15
Overcast
16°
16
Sunny
14°
17
Sunny
20°
18
Patchy rain possible
16°
19
Sunny
15°
20
Sunny
17°
21
Sunny
17°
22
Patchy rain possible
18°
23
Overcast
12°
24
Patchy rain possible
14°
25
Partly cloudy
14°
26
Patchy rain possible
11°
27
Overcast
5°
28
Overcast
7°
29
Light snow
7°
30
Overcast
6°

Temperatures trend during September in Yellowknife

See the weather trend as well as the moving average line

September weather in Yellowknife day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 1 mm 5
2 Sept. Patchy rain possible
Patchy rain possible
 16° /8° 1.2 mm 4
3 Sept. Overcast
Overcast
 13° /6° 0.1 mm 3
4 Sept. Overcast
Overcast
 12° /5° 0 mm 3
5 Sept. Overcast
Overcast
 14° /4° 0 mm 4
6 Sept. Partly cloudy
Partly cloudy
 18° /8° 0 mm 5
7 Sept. Cloudy
Cloudy
 17° /8° 0 mm 4
8 Sept. Overcast
Overcast
 16° /8° 0 mm 4
9 Sept. Cloudy
Cloudy
 17° /8° 4.1 mm 4
10 Sept. Sunny
Sunny
 15° /8° 1.8 mm 4
11 Sept. Sunny
Sunny
 18° /8° 0 mm 5
12 Sept. Overcast
Overcast
 19° /11° 0.1 mm 5
13 Sept. Overcast
Overcast
 19° /10° 0 mm 5
14 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 1.1 mm 0.2
15 Sept. Overcast
Overcast
 16° /10° 0.1 mm 0.1
16 Sept. Sunny
Sunny
 14° /7° 0 mm 0.4
17 Sept. Sunny
Sunny
 20° /9° 0 mm 0.5
18 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 0.5 mm 0
19 Sept. Sunny
Sunny
 15° /8° 0 mm 4
20 Sept. Sunny
Sunny
 17° /9° 0 mm 4
21 Sept. Sunny
Sunny
 17° /10° 0 mm 4
22 Sept. Patchy rain possible
Patchy rain possible
 18° /12° 3.3 mm 3
23 Sept. Overcast
Overcast
 12° /9° 0 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 14° /8° 0.4 mm 3
25 Sept. Partly cloudy
Partly cloudy
 14° /8° 0 mm 4
26 Sept. Patchy rain possible
Patchy rain possible
 11° /7° 0.9 mm 3
27 Sept. Overcast
Overcast
 5° /4° 0 mm 1
28 Sept. Overcast
Overcast
 7° /2° 0 mm 2
29 Sept. Light snow
Light snow
 7° /2° 0.2 mm 2
30 Sept. Overcast
Overcast
 6° /0° 0.7 mm 2
Next
Important Notice
Our weather forecast for Yellowknife 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 Yellowknife forecast closer to your planned date for the most up-to-date weather information.
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Yellowknife in September - FAQ

What are the expected maximum and minimum temperatures in Yellowknife during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 5°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Yellowknife during September?
In September, Yellowknife can expect light to moderate rainfall, totaling 45.5 mm across approximately 2 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Yellowknife during September?
The average wind speed in Yellowknife during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Yellowknife

Explore the daily rainfall trends and prepare for Yellowknifes September weather 💧

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Location coordinates Where is Yellowknife?

Get accurate weather forecasts for Yellowknife, located at latitude 62.454 and longitude -114.372. Stay updated with localized weather information tailored for Yellowknife.

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