Custer weather in September 2026

Q: How hot is it in Custer in September?

Daytime temperatures usually reach 23°C in Custer in September, falling to 9°C at night.

Q: How sunny is it in Custer in September?

There are normally 8 hours of bright sunshine each day in Custer in September - that's 64% of daylight hours.

Q: 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 74mm.

Expect daytime maximum temperatures of 72°F in Custer, South Dakota in September based on long-term weather averages. There are 8 hours of sunshine per day on average.

72
72°F max day temperature
8
8 hours of sunshine per day
8
8 days with some rainfall
43
43°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
1.3
1.3 inches of monthly rainfall
6
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 73°F in Custer in September, falling to 48°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 64% 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 2.9 inches.

Custer September sunrise & sunset times

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

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

Date	Sunrise times	Sunset times
Tuesday, 1st September 2026	05:18	18:30
Tuesday, 15th September 2026	05:34	18:04
Wednesday, 30th September 2026	05:51	17:37

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South Dakota - quick facts
Flight time^✝	12.5 hours
Time difference	UK -6 to -7 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	South Dakota Department of Tourism