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August weather forecast in Helena

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

27 July, sun

	629 mmHg		48%
	3.7 m/s

27 July, Sunday. day, 28°; night, 11°; clear

28 July, mon

	630 mmHg		48%
	4.1 m/s

28 July, Monday. day, 28°; night, 11°; rain

29 July, tue

	630 mmHg		48%
	3.9 m/s

29 July, Tuesday. day, 28°; night, 11°; clear

30 July, wed

	630 mmHg		46%
	4.1 m/s

30 July, Wednesday. day, 28°; night, 11°; clear

31 July, thu

	630 mmHg		45%
	3.9 m/s

31 July, Thursday. day, 28°; night, 11°; clear

1 August, fri

	630 mmHg		45%
	4.1 m/s

1 August, Friday. day, 28°; night, 11°; clear

2 August, sat

	630 mmHg		47%
	4 m/s

2 August, Saturday. day, 28°; night, 12°; rain

3 August, sun

	630 mmHg		49%
	4 m/s

3 August, Sunday. day, 28°; night, 11°; overcast

4 August, mon

	630 mmHg		49%
	4 m/s

4 August, Monday. day, 27°; night, 11°; clear

5 August, tue

	629 mmHg		52%
	3.8 m/s

5 August, Tuesday. day, 27°; night, 10°; clear

6 August, wed

	629 mmHg		51%
	3.9 m/s

6 August, Wednesday. day, 27°; night, 11°; partly cloudy

7 August, thu

	628 mmHg		52%
	4.1 m/s

7 August, Thursday. day, 27°; night, 11°; rain

8 August, fri

	629 mmHg		50%
	4 m/s

8 August, Friday. day, 26°; night, 10°; rain

9 August, sat

	630 mmHg		52%
	4.1 m/s

9 August, Saturday. day, 26°; night, 9°; clear

10 August, sun

	629 mmHg		50%
	3.8 m/s

10 August, Sunday. day, 26°; night, 10°; clear

11 August, mon

	629 mmHg		51%
	3.9 m/s

11 August, Monday. day, 27°; night, 10°; rain

12 August, tue

	629 mmHg		48%
	3.9 m/s

12 August, Tuesday. day, 26°; night, 10°; clear

13 August, wed

	630 mmHg		51%
	3.9 m/s

13 August, Wednesday. day, 26°; night, 9°; partly cloudy

14 August, thu

	629 mmHg		48%
	3.8 m/s

14 August, Thursday. day, 26°; night, 10°; clear

15 August, fri

	629 mmHg		46%
	4 m/s

15 August, Friday. day, 27°; night, 10°; clear

16 August, sat

	629 mmHg		48%
	4 m/s

16 August, Saturday. day, 27°; night, 10°; clear

17 August, sun

	629 mmHg		50%
	3.7 m/s

17 August, Sunday. day, 26°; night, 9°; rain

18 August, mon

	629 mmHg		51%
	3.9 m/s

18 August, Monday. day, 26°; night, 10°; rain

19 August, tue

	628 mmHg		49%
	4.1 m/s

19 August, Tuesday. day, 26°; night, 9°; clear

20 August, wed

	628 mmHg		49%
	3.6 m/s

20 August, Wednesday. day, 26°; night, 9°; rain

21 August, thu

	628 mmHg		51%
	3.8 m/s

21 August, Thursday. day, 26°; night, 9°; rain

22 August, fri

	628 mmHg		50%
	3.8 m/s

22 August, Friday. day, 26°; night, 10°; clear

23 August, sat

	628 mmHg		50%
	4.1 m/s

23 August, Saturday. day, 25°; night, 9°; partly cloudy

24 August, sun

	628 mmHg		51%
	4.5 m/s

24 August, Sunday. day, 25°; night, 9°; partly cloudy

25 August, mon

	628 mmHg		50%
	4.19 m/s

25 August, Monday. day, 25°; night, 8°; clear

26 August, tue

	628 mmHg		48%
	4.3 m/s

26 August, Tuesday. day, 26°; night, 8°; clear

27 August, wed

	628 mmHg		47%
	4.1 m/s

27 August, Wednesday. day, 26°; night, 9°; clear

28 August, thu

	629 mmHg		47%
	4.1 m/s

28 August, Thursday. day, 25°; night, 9°; clear

29 August, fri

	628 mmHg		48%
	4.1 m/s

29 August, Friday. day, 26°; night, 9°; clear

30 August, sat

	627 mmHg		48%
	4.1 m/s

30 August, Saturday. day, 26°; night, 9°; clear

31 August, sun

	627 mmHg		47%
	4.4 m/s

31 August, Sunday. day, 25°; night, 8°; clear

1 September, mon

	627 mmHg		48%
	4.4 m/s

1 September, Monday. day, 24°; night, 8°; clear

2 September, tue

	628 mmHg		46%
	4.5 m/s

2 September, Tuesday. day, 25°; night, 8°; clear

3 September, wed

	628 mmHg		45%
	4.19 m/s

3 September, Wednesday. day, 25°; night, 8°; clear

4 September, thu

	628 mmHg		51%
	3.9 m/s

4 September, Thursday. day, 24°; night, 8°; partly cloudy

5 September, fri

	628 mmHg		52%
	4.1 m/s

5 September, Friday. day, 23°; night, 8°; rain

6 September, sat

	629 mmHg		54%
	4 m/s

6 September, Saturday. day, 23°; night, 7°; partly cloudy

Average data for 10 years

Helena August

18

sunny days

8

days with precipitation

1

cloudy day

18 sunny days; 8 days with precipitation; 1 cloudy day;

49

%

air humidity

2.09

m/s

WindSW

33

mm of precipitation

(7% of annual average)

air humidity 49%; 33 millimeters of precipitation (7% of annual average); Wind south-westerly 2.09 Meters per second

Weather graphs for August

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

S

SW

SW

S

S

S

SW

SW

S

S

SW

SW

SW

SW

SW

SW

SW

S

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

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

24

25

26

27

28

29

30

31

Daytime temperature

Night-time temperature

Cities near you

West Yellowstone
Medicine Hat
Bozeman
Billings
Cody
Jackson
Missoula
Idaho Falls
Big Sky

Cities with similar weather in August

Paris
Almaty
Munich
Dusseldorf
Cologne
Altay
Bern
Bonn
Nantes

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

In August, the weather in Helena is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Helena has 18 sunny, 8 rainy, 4 partly cloudy, and 1 cloudy day in August. The rains are usually light. August as well as July and September is considered the most comfortable time to visit Helena.

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