- Kids stay & eat for free at Marriot Bonvoy
- Destinations include Europe, Middle East & Africa
- Valid for up to 2 adults & 2 kids aged up to 12
South Dakota weather in August 2025
Expect 29°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in South Dakota in August. Check more long-term weather averages for South Dakota 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
- 99 days with some rainfall
- 1515°C min night temperature
- 1414 hours of daylight per day
- MModerate heat & humidity
- 7474 mm of monthly rainfall
- 88 (Very High) UV index
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Recommended for South Dakota
The August weather guide for South Dakota (Sioux Falls) 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.
Top South Dakota destinations
Below are average maximum temperatures at popular countries, regions and places in South Dakota in August. Select a holiday destination to see more weather parameters.
All South Dakota destinations
Metric (°C / mm) | Imperial (°F / inches)
More about the USA
How hot is it in South Dakota in August?
Daytime temperatures usually reach 29°C in Sioux Falls, South Dakota in August with moderate heat and humidity, falling to 15°C at night.
How sunny is it in South Dakota in August?
There are normally 10 hours of bright sunshine each day in Sioux Falls, South Dakota in August - that's 71% of daylight hours.
Does it rain in South Dakota in August?
There are usually 9 days with some rain in Sioux Falls, South Dakota in August and the average monthly rainfall is 74mm.
South Dakota August sunrise & sunset times
Browse the sunrise and sunset times for South Dakota in August 2025. Select a month to view South Dakota sunrise and sunset times for the next 12 months. The South Dakota sunrise and sunset times shown below are for Sioux Falls.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Friday, 1st August 2025 | 05:17 | 19:49 |
Saturday, 16th August 2025 | 05:33 | 19:28 |
Sunday, 31st August 2025 | 05:50 | 19:03 |
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