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September weather forecast in Thief River Falls

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

	731 mmHg		70%
	5.6 m/s

31 August, Sunday. day, 25°; night, 14°; rain

1 September, mon

	731 mmHg		71%
	6 m/s

1 September, Monday. day, 24°; night, 14°; rain

2 September, tue

	731 mmHg		71%
	5.7 m/s

2 September, Tuesday. day, 23°; night, 14°; rain

3 September, wed

	731 mmHg		71%
	5.4 m/s

3 September, Wednesday. day, 23°; night, 12°; clear

4 September, thu

	732 mmHg		71%
	5.2 m/s

4 September, Thursday. day, 24°; night, 13°; clear

5 September, fri

	731 mmHg		72%
	5.4 m/s

5 September, Friday. day, 23°; night, 14°; partly cloudy

6 September, sat

	731 mmHg		72%
	5.4 m/s

6 September, Saturday. day, 23°; night, 13°; rain

7 September, sun

	732 mmHg		71%
	5.2 m/s

7 September, Sunday. day, 22°; night, 11°; clear

8 September, mon

	733 mmHg		70%
	5.3 m/s

8 September, Monday. day, 21°; night, 11°; clear

9 September, tue

	732 mmHg		72%
	4.9 m/s

9 September, Tuesday. day, 21°; night, 10°; clear

10 September, wed

	731 mmHg		71%
	5.3 m/s

10 September, Wednesday. day, 22°; night, 11°; clear

11 September, thu

	732 mmHg		70%
	5.2 m/s

11 September, Thursday. day, 21°; night, 12°; partly cloudy

12 September, fri

	732 mmHg		71%
	5.3 m/s

12 September, Friday. day, 21°; night, 11°; partly cloudy

13 September, sat

	731 mmHg		71%
	5.5 m/s

13 September, Saturday. day, 20°; night, 11°; partly cloudy

14 September, sun

	732 mmHg		72%
	5.1 m/s

14 September, Sunday. day, 19°; night, 9°; rain

15 September, mon

	733 mmHg		71%
	4.8 m/s

15 September, Monday. day, 20°; night, 9°; clear

16 September, tue

	731 mmHg		73%
	5.4 m/s

16 September, Tuesday. day, 21°; night, 11°; clear

17 September, wed

	731 mmHg		73%
	5.3 m/s

17 September, Wednesday. day, 20°; night, 11°; partly cloudy

18 September, thu

	730 mmHg		74%
	5.5 m/s

18 September, Thursday. day, 20°; night, 10°; overcast

19 September, fri

	729 mmHg		72%
	5.9 m/s

19 September, Friday. day, 20°; night, 12°; partly cloudy

20 September, sat

	729 mmHg		72%
	6 m/s

20 September, Saturday. day, 19°; night, 10°; rain

21 September, sun

	730 mmHg		73%
	6 m/s

21 September, Sunday. day, 18°; night, 9°; rain

22 September, mon

	733 mmHg		73%
	5.3 m/s

22 September, Monday. day, 17°; night, 8°; rain

23 September, tue

	732 mmHg		71%
	5.5 m/s

23 September, Tuesday. day, 18°; night, 8°; rain

24 September, wed

	730 mmHg		74%
	5.7 m/s

24 September, Wednesday. day, 18°; night, 9°; rain

25 September, thu

	731 mmHg		73%
	4.9 m/s

25 September, Thursday. day, 18°; night, 8°; clear

26 September, fri

	730 mmHg		72%
	5.5 m/s

26 September, Friday. day, 19°; night, 9°; clear

27 September, sat

	730 mmHg		71%
	5.2 m/s

27 September, Saturday. day, 18°; night, 8°; clear

28 September, sun

	732 mmHg		71%
	5.5 m/s

28 September, Sunday. day, 17°; night, 7°; clear

29 September, mon

	732 mmHg		69%
	5.8 m/s

29 September, Monday. day, 18°; night, 7°; partly cloudy

30 September, tue

	731 mmHg		70%
	5.8 m/s

30 September, Tuesday. day, 17°; night, 8°; partly cloudy

1 October, wed

	732 mmHg		70%
	5.8 m/s

1 October, Wednesday. day, 16°; night, 7°; clear

2 October, thu

	732 mmHg		67%
	5.3 m/s

2 October, Thursday. day, 16°; night, 7°; clear

3 October, fri

	732 mmHg		69%
	5.5 m/s

3 October, Friday. day, 15°; night, 6°; rain

4 October, sat

	733 mmHg		69%
	5.8 m/s

4 October, Saturday. day, 14°; night, 5°; clear

Average data for 10 years

Thief River Falls September

12

sunny days

9

days with precipitation

5

cloudy days

12 sunny days; 9 days with precipitation; 5 cloudy days;

72

%

air humidity

3.7

m/s

WindSW

74

mm of precipitation

(11% of annual average)

air humidity 72%; 74 millimeters of precipitation (11% of annual average); Wind south-westerly 3.7 Meters per second

Weather graphs for September

TemperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

S

S

S

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

S

S

S

S

SW

SW

SW

SW

S

SW

SW

S

SW

SW

S

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

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27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Winnipeg
Mora
Fargo
Aberdeen
Marshall
Watertown
Dryden
Jamestown
International Falls

Cities with similar weather in September

Gomel
Brest
Warsaw
Semey
Geneva
Dresden
Gyumri
Rechitsa
Bansko

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

In September, the weather in Thief River Falls is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Thief River Falls has 12 sunny, 9 rainy, 8 partly cloudy, and 1 cloudy day in September. The rains are usually heavy.

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