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Custer weather in August 2026
Expect daytime maximum temperatures of 28°C in Custer, South Dakota in August based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 42 mm of rainfall in the month.
- 28°C max day temperature
28 - 10 hours of sunshine per day
- 9 days with some rainfall
9 - 11°C min night temperature
11 - 14 hours of daylight per day
14 - Low heat & humidity
L - 42 mm of monthly rainfall
42 - 8 (Very High) UV index
8
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Recommended for South Dakota
The August 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 / mm) | Imperial (°F / inches)
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How hot is it in Custer in August?
Daytime temperatures usually reach 29°C in Custer in August with moderate heat and humidity, falling to 15°C at night.
How sunny is it in Custer in August?
There are normally 10 hours of bright sunshine each day in Custer in August - that's 71% of daylight hours.
Does it rain in Custer in August?
There are usually 9 days with some rain in Custer in August and the average monthly rainfall is 74mm.
Custer August sunrise & sunset times
Browse the sunrise and sunset times for Custer in August 2026. Select a month to view Custer sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Saturday, 1st August 2026 | 04:43 | 19:17 |
| Sunday, 16th August 2026 | 05:00 | 18:56 |
| Monday, 31st August 2026 | 05:17 | 18:31 |
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