Weather in Rapid City: August
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Average day temperature: | 83.4°F |
| Average night temperature: | 64.6°F | |
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Number of sunny days: | 22 days |
| Day length: | 13.3 - 14.6 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.4 in. | |
| more information | ||
14 days
forecast
forecast
| Rapid City |
weather in
September
September
| Rapid City |
Air temperature in August, °F
Show year:
2025
2024
2023
The highest day temperature during August of 2025 was 95°F. At the same time the lowest night temperature was 56°F. Daily and nightly averages during August were 80.1°F and 65.1°F.
Sunny, partly cloudy and cloudy days
Mostly all days in August are sunny but cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in Rapid City in August is 0.4 in. Other months of the year show relatively similar values.
Wind speed in August, mph
The average wind speed value in August is 7.8 mph It makes August lest windy month of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in August is: 10.6.
Best time for vacation in Rapid City
Rapid City on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Rapid City
Local time: 12:59
January 15, thursday
1500
48°F
SE
23 mph
23 mph
1800
37°F
S
30 mph
30 mph
2100
32°F
SE
30 mph
30 mph
January 16, friday
0000
28°F
SE
30 mph
30 mph
0300
27°F
SE
32 mph
32 mph
0600
25°F
SE
35 mph
35 mph
0900
23°F
SE
39 mph
39 mph
1200
25°F
SE
32 mph
32 mph
