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
  23°C max day temperature
• 8
  8 hours of sunshine per day
• 8
  8 days with some rainfall
• 9
  9°C min night temperature
• 12
  12 hours of daylight per day
• 0
  No heat & humidity
• 74
  74 mm of monthly rainfall
• 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.

• 23
  Rapid City
• 23
  Sioux Falls
• 22
  Custer
• 22
  Deadwood

All South Dakota destinations

• Aberdeen
• Custer
• Deadwood
• Hot Springs
• Keystone
• Lead
• Pierre
• Rapid City
• Sioux Falls

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

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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.

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