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August weather forecast in Rapid City

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

	672 mmHg		57%
	5.2 m/s

27 July, Sunday. day, 29°; night, 16°; rain

28 July, mon

	672 mmHg		58%
	5.2 m/s

28 July, Monday. day, 29°; night, 15°; rain

29 July, tue

	673 mmHg		58%
	5.3 m/s

29 July, Tuesday. day, 29°; night, 15°; rain

30 July, wed

	672 mmHg		57%
	4.9 m/s

30 July, Wednesday. day, 30°; night, 15°; clear

31 July, thu

	672 mmHg		55%
	5.3 m/s

31 July, Thursday. day, 30°; night, 16°; clear

1 August, fri

	673 mmHg		55%
	5.1 m/s

1 August, Friday. day, 30°; night, 16°; clear

2 August, sat

	672 mmHg		57%
	5.5 m/s

2 August, Saturday. day, 30°; night, 16°; clear

3 August, sun

	672 mmHg		60%
	5.8 m/s

3 August, Sunday. day, 29°; night, 16°; rain

4 August, mon

	672 mmHg		65%
	5.2 m/s

4 August, Monday. day, 28°; night, 15°; rain

5 August, tue

	672 mmHg		64%
	5.3 m/s

5 August, Tuesday. day, 28°; night, 15°; partly cloudy

6 August, wed

	672 mmHg		63%
	5.6 m/s

6 August, Wednesday. day, 29°; night, 15°; rain

7 August, thu

	671 mmHg		58%
	4.8 m/s

7 August, Thursday. day, 29°; night, 15°; rain

8 August, fri

	671 mmHg		58%
	4.9 m/s

8 August, Friday. day, 29°; night, 16°; rain

9 August, sat

	672 mmHg		58%
	5.1 m/s

9 August, Saturday. day, 28°; night, 15°; clear

10 August, sun

	673 mmHg		58%
	5.2 m/s

10 August, Sunday. day, 28°; night, 14°; clear

11 August, mon

	672 mmHg		60%
	5.4 m/s

11 August, Monday. day, 29°; night, 15°; rain

12 August, tue

	672 mmHg		58%
	5.4 m/s

12 August, Tuesday. day, 29°; night, 15°; clear

13 August, wed

	673 mmHg		57%
	5.5 m/s

13 August, Wednesday. day, 28°; night, 14°; clear

14 August, thu

	672 mmHg		56%
	5.7 m/s

14 August, Thursday. day, 28°; night, 15°; rain

15 August, fri

	671 mmHg		58%
	5.3 m/s

15 August, Friday. day, 28°; night, 15°; rain

16 August, sat

	672 mmHg		55%
	5.2 m/s

16 August, Saturday. day, 28°; night, 14°; clear

17 August, sun

	672 mmHg		52%
	5.6 m/s

17 August, Sunday. day, 29°; night, 13°; clear

18 August, mon

	671 mmHg		56%
	6.1 m/s

18 August, Monday. day, 28°; night, 14°; clear

19 August, tue

	671 mmHg		58%
	5.8 m/s

19 August, Tuesday. day, 27°; night, 13°; rain

20 August, wed

	671 mmHg		56%
	5.6 m/s

20 August, Wednesday. day, 28°; night, 14°; clear

21 August, thu

	672 mmHg		56%
	5.4 m/s

21 August, Thursday. day, 28°; night, 14°; clear

22 August, fri

	671 mmHg		54%
	5.5 m/s

22 August, Friday. day, 30°; night, 15°; clear

23 August, sat

	671 mmHg		54%
	5.7 m/s

23 August, Saturday. day, 30°; night, 15°; clear

24 August, sun

	671 mmHg		52%
	5.4 m/s

24 August, Sunday. day, 29°; night, 15°; clear

25 August, mon

	672 mmHg		55%
	5.3 m/s

25 August, Monday. day, 28°; night, 15°; clear

26 August, tue

	672 mmHg		61%
	5.2 m/s

26 August, Tuesday. day, 28°; night, 14°; rain

27 August, wed

	671 mmHg		58%
	5.2 m/s

27 August, Wednesday. day, 28°; night, 14°; partly cloudy

28 August, thu

	671 mmHg		57%
	5.2 m/s

28 August, Thursday. day, 28°; night, 14°; clear

29 August, fri

	672 mmHg		56%
	5.3 m/s

29 August, Friday. day, 28°; night, 13°; clear

30 August, sat

	671 mmHg		56%
	5.8 m/s

30 August, Saturday. day, 29°; night, 14°; clear

31 August, sun

	671 mmHg		55%
	6.4 m/s

31 August, Sunday. day, 28°; night, 14°; clear

1 September, mon

	671 mmHg		54%
	5.7 m/s

1 September, Monday. day, 28°; night, 13°; clear

2 September, tue

	671 mmHg		52%
	5.9 m/s

2 September, Tuesday. day, 28°; night, 14°; clear

3 September, wed

	671 mmHg		50%
	5.5 m/s

3 September, Wednesday. day, 28°; night, 13°; clear

4 September, thu

	671 mmHg		52%
	5.7 m/s

4 September, Thursday. day, 28°; night, 13°; clear

5 September, fri

	671 mmHg		52%
	5.5 m/s

5 September, Friday. day, 28°; night, 13°; clear

6 September, sat

	671 mmHg		54%
	5.9 m/s

6 September, Saturday. day, 27°; night, 12°; rain

Average data for 10 years

Rapid City August

19

sunny days

10

days with precipitation

1

cloudy day

19 sunny days; 10 days with precipitation; 1 cloudy day;

57

%

air humidity

3.2

m/s

WindS

57

mm of precipitation

(10% of annual average)

air humidity 57%; 57 millimeters of precipitation (10% of annual average); Wind southerly 3.2 Meters per second

Weather graphs for August

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

S

S

S

S

S

S

S

S

SW

S

S

SW

SW

SW

SW

SW

S

SW

SW

S

S

S

S

SW

SW

S

S

SW

S

S

S

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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25

26

27

28

29

30

31

Daytime temperature

Night-time temperature

Cities near you

Bismarck
Sheridan
Cheyenne
Miles City
Greeley
Glendive
Evans
Gillette
Laramie

Cities with similar weather in August

Toronto
Rio de Janeiro
Genoa
San Remo
Como
Kayseri
Portimão
Milwaukee
Bismarck

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

August in Rapid City is the sunniest month of the year. In August, the weather in Rapid City is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Rapid City has 19 sunny, 10 rainy, and 2 partly cloudy days in August. The rains are usually moderate.

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