Rapid City weather in September 2026

Expect daytime maximum temperatures of 23°C in Rapid City, South Dakota in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

  • 23°C maximum daytime temperature in September in Rapid City23
    23°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Rapid City7
    7 days with some rainfall
  • 7°C minimum night-time temperature in September in Rapid City7
    7°C min night temperature
  • 12 hours of daylight per day in September in Rapid City12
    12 hours of daylight per day
  • No heat & humidity in September in Rapid City0
    No heat & humidity
  • 30 mm monthly rainfall in September in Rapid City30
    30 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Rapid City6
    6 (High) UV index

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The September weather guide for South Dakota (Rapid City) 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)

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How hot is it in Rapid City in September?

Daytime temperatures usually reach 23°C in Rapid City in September, falling to 7°C at night.

How sunny is it in Rapid City in September?

There are normally 9 hours of bright sunshine each day in Rapid City in September - that's 69% of daylight hours.

Does it rain in Rapid City in September?

There are usually 7 days with some rain in Rapid City in September and the average monthly rainfall is 30mm.

Rapid City September sunrise & sunset times

Browse the sunrise and sunset times for Rapid City in September 2026. Select a month to view Rapid City sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:16 18:29
Tuesday, 15th September 2026 05:32 18:03
Wednesday, 30th September 2026 05:50 17:35

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