Rapid City weather in September

Check the Weather in Rapid City, South Dakota in September before you book your next holiday. This gives the best indication of the weather in September and includes figures for temperature, sunshine and rainfall.

  • 23°C maximum daytime temperature in September in Rapid City23
    23°C max day temperature
  • 9 hours of sunshine per day (69% of daylight hours) in September in Rapid City9
    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

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

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