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Rapid City weather in August 2025
Expect 84°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Rapid City in August. Check more long-term weather averages for Rapid City in August before you book your next holiday to South Dakota in 2025/2026.
- 8484°F max day temperature
- 10 hours of sunshine per day
- 88 days with some rainfall
- 5555°F min night temperature
- 1414 hours of daylight per day
- MModerate heat & humidity
- 1.91.9 inches of monthly rainfall
- 88 (Very High) UV index
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Recommended for South Dakota
The August weather guide for South Dakota (Rapid City) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
More about the USA
How hot is it in Rapid City in August?
Daytime temperatures usually reach 84°F in Rapid City in August with moderate heat and humidity, falling to 55°F at night.
How sunny is it in Rapid City in August?
There are normally 10 hours of bright sunshine each day in Rapid City in August - that's 74% of daylight hours.
Does it rain in Rapid City in August?
There are usually 8 days with some rain in Rapid City in August and the average monthly rainfall is 1.9 inches.
Rapid City August sunrise & sunset times
Browse the sunrise and sunset times for Rapid City in August 2025. Select a month to view Rapid City sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Friday, 1st August 2025 | 04:41 | 19:16 |
Saturday, 16th August 2025 | 04:58 | 18:55 |
Sunday, 31st August 2025 | 05:15 | 18:30 |
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