South Dakota weather in August 2025

Q: 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.

Q: 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.

Q: 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.

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.

29
29°C max day temperature
10
10 hours of sunshine per day
9
9 days with some rainfall
15
15°C min night temperature
14
14 hours of daylight per day
M
Moderate heat & humidity
74
74 mm of monthly rainfall
8
8 (Very High) UV index

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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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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South Dakota - quick facts
Flight time^✝	12.5 hours
Time difference	UK -6 to -7 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	South Dakota Department of Tourism