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Rapid City weather in August 2025
Expect 29°C 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.
- 2929°C max day temperature
- 10 hours of sunshine per day
- 88 days with some rainfall
- 1313°C min night temperature
- 1414 hours of daylight per day
- MModerate heat & humidity
- 4848 mm of monthly rainfall
- 88 (Very High) UV index
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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 / mm) | Imperial (°F / inches)
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How hot is it in Rapid City in August?
Daytime temperatures usually reach 29°C in Rapid City in August with moderate heat and humidity, falling to 13°C 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 48mm.
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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