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September weather forecast in Yellowknife

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	735 mmHg		75%
	5.2 m/s		+8

31 August, Sunday. day, 15°; night, 8°; partly cloudy

1 September, mon

	735 mmHg		76%
	5.3 m/s		+8

1 September, Monday. day, 15°; night, 8°; rain

2 September, tue

	735 mmHg		76%
	5.3 m/s		+8

2 September, Tuesday. day, 15°; night, 8°; rain

3 September, wed

	737 mmHg		74%
	5.5 m/s		+8

3 September, Wednesday. day, 15°; night, 8°; partly cloudy

4 September, thu

	737 mmHg		73%
	5.4 m/s		+8

4 September, Thursday. day, 15°; night, 8°; partly cloudy

5 September, fri

	737 mmHg		75%
	5.5 m/s		+8

5 September, Friday. day, 15°; night, 8°; partly cloudy

6 September, sat

	739 mmHg		75%
	5.6 m/s		+8

6 September, Saturday. day, 14°; night, 7°; clear

7 September, sun

	738 mmHg		72%
	5.7 m/s		+8

7 September, Sunday. day, 15°; night, 8°; clear

8 September, mon

	736 mmHg		74%
	5.4 m/s		+7

8 September, Monday. day, 15°; night, 8°; partly cloudy

9 September, tue

	736 mmHg		75%
	5.4 m/s		+7

9 September, Tuesday. day, 14°; night, 7°; partly cloudy

10 September, wed

	737 mmHg		75%
	5.7 m/s		+7

10 September, Wednesday. day, 13°; night, 7°; rain

11 September, thu

	736 mmHg		76%
	6 m/s		+7

11 September, Thursday. day, 13°; night, 7°; rain

12 September, fri

	737 mmHg		75%
	5.6 m/s		+7

12 September, Friday. day, 12°; night, 6°; partly cloudy

13 September, sat

	738 mmHg		75%
	5 m/s		+7

13 September, Saturday. day, 13°; night, 6°; clear

14 September, sun

	738 mmHg		74%
	5.4 m/s		+7

14 September, Sunday. day, 12°; night, 5°; partly cloudy

15 September, mon

	738 mmHg		74%
	6 m/s		+6

15 September, Monday. day, 12°; night, 6°; overcast

16 September, tue

	739 mmHg		73%
	5.9 m/s		+6

16 September, Tuesday. day, 11°; night, 5°; clear

17 September, wed

	737 mmHg		77%
	5.9 m/s		+6

17 September, Wednesday. day, 10°; night, 5°; rain

18 September, thu

	736 mmHg		75%
	5.5 m/s		+6

18 September, Thursday. day, 10°; night, 5°; overcast

19 September, fri

	736 mmHg		77%
	5.5 m/s		+6

19 September, Friday. day, 10°; night, 5°; rain

20 September, sat

	736 mmHg		78%
	5.6 m/s		+6

20 September, Saturday. day, 10°; night, 5°; rain

21 September, sun

	737 mmHg		75%
	5.7 m/s		+6

21 September, Sunday. day, 10°; night, 4°; overcast

22 September, mon

	736 mmHg		78%
	5.7 m/s		+6

22 September, Monday. day, 11°; night, 5°; clear

23 September, tue

	734 mmHg		75%
	6.1 m/s		+6

23 September, Tuesday. day, 12°; night, 6°; clear

24 September, wed

	733 mmHg		76%
	6 m/s		+5

24 September, Wednesday. day, 10°; night, 5°; rain

25 September, thu

	734 mmHg		80%
	5.7 m/s		+5

25 September, Thursday. day, 9°; night, 4°; rain

26 September, fri

	735 mmHg		79%
	5.9 m/s		+5

26 September, Friday. day, 9°; night, 3°; overcast

27 September, sat

	736 mmHg		76%
	6.3 m/s		+5

27 September, Saturday. day, 8°; night, 4°; overcast

28 September, sun

	736 mmHg		76%
	6.8 m/s		+5

28 September, Sunday. day, 8°; night, 3°; overcast

29 September, mon

	736 mmHg		79%
	5.8 m/s		+5

29 September, Monday. day, 7°; night, 2°; overcast

30 September, tue

	737 mmHg		77%
	5.3 m/s		+5

30 September, Tuesday. day, 7°; night, 2°; overcast

1 October, wed

	738 mmHg		77%
	6 m/s		+5

1 October, Wednesday. day, 7°; night, 2°; rain

2 October, thu

	738 mmHg		78%
	5.8 m/s		+5

2 October, Thursday. day, 6°; night, 2°; rain

3 October, fri

	739 mmHg		77%
	5.7 m/s		+5

3 October, Friday. day, 6°; night, 1°; partly cloudy

4 October, sat

	739 mmHg		76%
	5.6 m/s		+4

4 October, Saturday. day, 5°; night, 1°; clear

Average data for 10 years

Yellowknife September

6

sunny days

9

days with precipitation

11

cloudy days

6 sunny days; 9 days with precipitation; 11 cloudy days;

76

%

air humidity

4

m/s

WindS

43

mm of precipitation

(15% of annual average)

+6

°C

Water temperature

air humidity 76%; 43 millimeters of precipitation (15% of annual average); Wind southerly 4 Meters per second; Water temperature +6°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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S

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S

S

S

S

S

S

S

S

S

S

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SE

S

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SE

S

S

S

S

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SW

S

S

S

SW

S

1

Average data for 10 years

2

3

4

5

6

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9

10

11

12

13

14

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18

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20

21

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29

30

Daytime temperature

Night-time temperature

Cities near you

Edmonton
Dawson Creek
Grande Prairie
Snare Lake
Peace River
Fort Saint John
Rainbow Lake
Ft McMurray
Fort MacKay

Cities with similar weather in September

Helsinki
Riga
Tallinn
Stockholm
Cholpon-Ata
Reykyavik
Oslo
Yurmala
Palanga

The weather forecast for September 2025 is based on historical data from the past 10 years.

September in Yellowknife is the windiest month of the year. In September, the weather in Yellowknife is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Yellowknife has 9 rainy, 8 cloudy, 7 partly cloudy, and 6 sunny days in September. The rains are usually light.

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