Rapid City weather in September 2025

Expect daytime maximum temperatures of 73°F in Rapid City, South Dakota in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

  • 73°F maximum daytime temperature in September in Rapid City73
    73°F max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in September in Rapid City7
    7 days with some rainfall
  • 45°F minimum night-time temperature in September in Rapid City45
    45°F 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
  • 1.2 inches monthly rainfall in September in Rapid City1.2
    1.2 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Rapid City6
    6 (High) UV index

More about Rapid City

Rapid City by month

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

Recommended for South Dakota

GO Airport Shuttle discount code: 5% off airport transfers

  • Save EXTRA 5% on airport transfers worldwide
  • Book private taxis & shuttle buses with discount code
  • Enter in coupon box on 'Reservations' page
Show discount codeShow discount code ******WEB
Redeem GO Airport Shuttle discount code >>

Expires at 23:59 on Wednesday 31st Dec 2025

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)  |  Imperial (°F)

Back to top

More about the USA

How hot is it in Rapid City in September?

Daytime temperatures usually reach 73°F in Rapid City in September, falling to 45°F 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 1.2 inches.

Rapid City September sunrise & sunset times

Browse the sunrise and sunset times for Rapid City in September 2025. Select a month to view Rapid City sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:16 18:28
Monday, 15th September 2025 05:32 18:03
Tuesday, 30th September 2025 05:50 17:35

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^