Custer weather in September 2025

Expect 72°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Custer in September. Check more long-term weather averages for Custer in September before you book your next holiday to South Dakota in 2025/2026.

  • 72°F maximum daytime temperature in September in Custer72
    72°F max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Custer8
    8 days with some rainfall
  • 43°F minimum night-time temperature in September in Custer43
    43°F min night temperature
  • 12 hours of daylight per day in September in Custer12
    12 hours of daylight per day
  • No heat & humidity in September in Custer0
    No heat & humidity
  • 1.3 inches monthly rainfall in September in Custer1.3
    1.3 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Custer6
    6 (High) UV index

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The September weather guide for South Dakota (Custer) 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)

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How hot is it in Custer in September?

Daytime temperatures usually reach 72°F in Custer in September, falling to 43°F at night.

How sunny is it in Custer in September?

There are normally 8 hours of bright sunshine each day in Custer in September - that's 67% of daylight hours.

Does it rain in Custer in September?

There are usually 8 days with some rain in Custer in September and the average monthly rainfall is 1.3 inches.

Custer September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:18 18:29
Monday, 15th September 2025 05:34 18:04
Tuesday, 30th September 2025 05:51 17:36

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