Idaho weather in January 2026

Expect 2°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Idaho in January based on long-term weather averages. There is usually 12 days with some rainfall and 38 mm of average monthly rainfall in January.

  • 2°C maximum daytime temperature in January in Idaho (Boise)2
    2°C max day temperature
  • 4 hours of sunshine per day
  • 12 days with some rainfall in January in Idaho (Boise)12
    12 days with some rainfall
  • -6°C minimum night-time temperature in January in Idaho (Boise)-6
    -6°C min night temperature
  • 9 hours of daylight per day in January in Idaho (Boise)9
    9 hours of daylight per day
  • No heat & humidity in January in Idaho (Boise)0
    No heat & humidity
  • 38 mm monthly rainfall in January in Idaho (Boise)38
    38 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Idaho (Boise)1
    1 (Low) UV index

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The January weather guide for Idaho (Boise) 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.

Top Idaho destinations

Below are average maximum temperatures at popular countries, regions and places in Idaho in January. Select a holiday destination to see more weather parameters.

All Idaho destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How cold is it in Idaho in January?

Daytime temperatures usually reach 2°C in Boise, Idaho in January, falling to -6°C at night.

How sunny is it in Idaho in January?

There are normally 4 hours of bright sunshine each day in Boise, Idaho in January - that's 38% of daylight hours.

Does it rain in Idaho in January?

There are usually 12 days with some rain in Boise, Idaho in January and the average monthly rainfall is 38mm. Rain may fall as snow in this month.

Idaho January sunrise & sunset times

Browse the sunrise and sunset times for Idaho in January 2026. Select a month to view Idaho sunrise and sunset times for the next 12 months. The Idaho sunrise and sunset times shown below are for Boise.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 08:18 17:19
Friday, 16th January 2026 08:14 17:35
Saturday, 31st January 2026 08:02 17:55

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