Sioux Falls weather in August 2025

Expect 29°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Sioux Falls in August. Check more long-term weather averages for Sioux Falls in August before you book your next holiday to South Dakota in 2025/2026.

  • 29°C maximum daytime temperature in August in Sioux Falls29
    29°C max day temperature
  • 10 hours of sunshine per day
  • 9 days with some rainfall in August in Sioux Falls9
    9 days with some rainfall
  • 15°C minimum night-time temperature in August in Sioux Falls15
    15°C min night temperature
  • 14 hours of daylight per day in August in Sioux Falls14
    14 hours of daylight per day
  • Moderate heat & humidity in August in Sioux FallsM
    Moderate heat & humidity
  • 74 mm monthly rainfall in August in Sioux Falls74
    74 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Sioux Falls8
    8 (Very High) UV index

More about Sioux Falls

Sioux Falls by month

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

Recommended for South Dakota

Carrentals.co.uk: Car hire offers from £5 a day

  • Find car hire worldwide from as little as £1 a day
  • Book car hire with no hidden costs & best price guarantee
  • Free cancellation up to 48 hours before pickup
Go to Carrentals.co.uk deal >>

View all Carrentals.co.uk offers

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.

Metric (°C / mm)  |  Imperial (°F / inches)

Back to top

More about the USA

How hot is it in Sioux Falls in August?

Daytime temperatures usually reach 29°C in Sioux Falls in August with moderate heat and humidity, falling to 15°C at night.

How sunny is it in Sioux Falls in August?

There are normally 10 hours of bright sunshine each day in Sioux Falls in August - that's 71% of daylight hours.

Does it rain in Sioux Falls in August?

There are usually 9 days with some rain in Sioux Falls in August and the average monthly rainfall is 74mm.

Sioux Falls August sunrise & sunset times

Browse the sunrise and sunset times for Sioux Falls in August 2025. Select a month to view Sioux Falls sunrise and sunset times for the next 12 months.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^