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Keystone weather in May 2025
Expect 19°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Keystone in May. Check more long-term weather averages for Keystone in May before you book your next holiday to South Dakota in 2025/2026.
- 1919°C max day temperature
- 9 hours of sunshine per day
- 1212 days with some rainfall
- 55°C min night temperature
- 1515 hours of daylight per day
- 0No heat & humidity
- 7777 mm of monthly rainfall
- 77 (High) UV index
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Recommended for South Dakota
The May weather guide for South Dakota (Keystone) 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)
More about the USA
How hot is it in Keystone in May?
Daytime temperatures usually reach 19°C in Keystone in May, falling to 5°C at night.
How sunny is it in Keystone in May?
There are normally 9 hours of bright sunshine each day in Keystone in May - that's 59% of daylight hours.
Does it rain in Keystone in May?
There are usually 12 days with some rain in Keystone in May and the average monthly rainfall is 77mm.
Keystone May sunrise & sunset times
Browse the sunrise and sunset times for Keystone in May 2025. Select a month to view Keystone sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Thursday, 1st May 2025 | 04:45 | 18:57 |
Friday, 16th May 2025 | 04:26 | 19:14 |
Saturday, 31st May 2025 | 04:15 | 19:29 |
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