Weather in Rapid City: August
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Average day temperature: | 83.8°F |
| Average night temperature: | 64.7°F | |
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Number of sunny days: | 21 days |
| Day length: | 13.3 - 14.6 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.6 in. | |
| more information | ||
14 days
forecast
forecast
| Rapid City |
weather in
September
September
| Rapid City |
Air temperature in August, °F
Show year:
2026
2025
2024
The highest day temperature during August of 2026 was 104°F. At the same time the lowest night temperature was 53°F. Daily and nightly averages during August were 86.3°F and 65.3°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 0.6 in. Other months of the year show relatively similar values.
Wind speed in August, mph
The average wind speed value in August is 8.0 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: 05:07
September 19, saturday
0600
59°F
NW
5 mph
5 mph
0900
59°F
N
3 mph
3 mph
1200
66°F
NW
6 mph
6 mph
1500
64°F
W
9 mph
9 mph
1800
61°F
W
7 mph
7 mph
2100
59°F
W
9 mph
9 mph
September 20, sunday
0000
57°F
NW
8 mph
8 mph
0300
57°F
NW
6 mph
6 mph
