Keystone weather in January 2026

Expect daytime maximum temperatures of 34°F in Keystone, South Dakota in January based on long-term weather averages. There are 5 hours of sunshine per day on average, which might fall as snow.

  • 34°F maximum daytime temperature in January in Keystone34
    34°F max day temperature
  • 5 hours of sunshine per day
  • 7 days with some rainfall in January in Keystone7
    7 days with some rainfall
  • 10°F minimum night-time temperature in January in Keystone10
    10°F min night temperature
  • 9 hours of daylight per day in January in Keystone9
    9 hours of daylight per day
  • No heat & humidity in January in Keystone0
    No heat & humidity
  • 0.4 inches monthly rainfall in January in Keystone0.4
    0.4 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Keystone1
    1 (Low) UV index

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The January 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)  |  Imperial (°F)

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How cold is it in Keystone in January?

Daytime temperatures usually reach 34°F in Keystone in January, falling to 10°F at night.

How sunny is it in Keystone in January?

There are normally 5 hours of bright sunshine each day in Keystone in January - that's 58% of daylight hours.

Does it rain in Keystone in January?

There are usually 7 days with some rain in Keystone in January and the average monthly rainfall is 0.4 inches. Rain may fall as snow in this month.

Keystone January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:28 16:27
Friday, 16th January 2026 07:24 16:43
Saturday, 31st January 2026 07:12 17:03

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