South Dakota weather in September 2025

Expect 23°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in South Dakota in September. Check more long-term weather averages for South Dakota in September before you book your next holiday to South Dakota in 2025/2026.

  • 23°C maximum daytime temperature in September in South Dakota (Sioux Falls)23
    23°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in South Dakota (Sioux Falls)8
    8 days with some rainfall
  • 9°C minimum night-time temperature in September in South Dakota (Sioux Falls)9
    9°C min night temperature
  • 12 hours of daylight per day in September in South Dakota (Sioux Falls)12
    12 hours of daylight per day
  • No heat & humidity in September in South Dakota (Sioux Falls)0
    No heat & humidity
  • 74 mm monthly rainfall in September in South Dakota (Sioux Falls)74
    74 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in South Dakota (Sioux Falls)6
    6 (High) UV index

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The September 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 September. Select a holiday destination to see more weather parameters.

All South Dakota destinations

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

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How hot is it in South Dakota in September?

Daytime temperatures usually reach 23°C in Sioux Falls, South Dakota in September, falling to 9°C at night.

How sunny is it in South Dakota in September?

There are normally 8 hours of bright sunshine each day in Sioux Falls, South Dakota in September - that's 64% of daylight hours.

Does it rain in South Dakota in September?

There are usually 8 days with some rain in Sioux Falls, South Dakota in September and the average monthly rainfall is 74mm.

South Dakota September sunrise & sunset times

Browse the sunrise and sunset times for South Dakota in September 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
Monday, 1st September 2025 05:51 19:02
Monday, 15th September 2025 06:07 18:36
Tuesday, 30th September 2025 06:24 18:09

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