Rapid City weather in January 2026

Expect daytime maximum temperatures of 2°C in Rapid City, 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.

  • 2°C maximum daytime temperature in January in Rapid City2
    2°C max day temperature
  • 5 hours of sunshine per day
  • 7 days with some rainfall in January in Rapid City7
    7 days with some rainfall
  • -12°C minimum night-time temperature in January in Rapid City-12
    -12°C min night temperature
  • 9 hours of daylight per day in January in Rapid City9
    9 hours of daylight per day
  • No heat & humidity in January in Rapid City0
    No heat & humidity
  • 8 mm monthly rainfall in January in Rapid City8
    8 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Rapid City1
    1 (Low) UV index

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The January weather guide for South Dakota (Rapid City) 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 cold is it in Rapid City in January?

Daytime temperatures usually reach 2°C in Rapid City in January, falling to -12°C at night.

How sunny is it in Rapid City in January?

There are normally 5 hours of bright sunshine each day in Rapid City in January - that's 57% of daylight hours.

Does it rain in Rapid City in January?

There are usually 7 days with some rain in Rapid City in January and the average monthly rainfall is 8mm. Rain may fall as snow in this month.

Rapid City January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:28 16:26
Friday, 16th January 2026 07:24 16:42
Saturday, 31st January 2026 07:11 17:02

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