Illinois weather in January 2025

Expect 30°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Illinois in January. Check more long-term weather averages for Illinois in January before you book your next holiday to Illinois in 2025/2026.

  • 30°F maximum daytime temperature in January in Illinois (Chicago)30
    30°F max day temperature
  • 4 hours of sunshine per day
  • 12 days with some rainfall in January in Illinois (Chicago)12
    12 days with some rainfall
  • 14°F minimum night-time temperature in January in Illinois (Chicago)14
    14°F min night temperature
  • 10 hours of daylight per day in January in Illinois (Chicago)10
    10 hours of daylight per day
  • No heat & humidity in January in Illinois (Chicago)0
    No heat & humidity
  • 1.7 inches monthly rainfall in January in Illinois (Chicago)1.7
    1.7 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Illinois (Chicago)1
    1 (Low) UV index
  • 39°F sea temperature in January in Illinois (Chicago)39
    39°F sea temperature

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The January weather guide for Illinois (Chicago) 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 Illinois destinations

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

All Illinois destinations

Metric (°C)  |  Imperial (°F)

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More about the USA

How cold is it in Illinois in January?

Daytime temperatures usually reach 30°F in Chicago, Illinois in January, falling to 14°F at night.

How sunny is it in Illinois in January?

There are normally 4 hours of bright sunshine each day in Chicago, Illinois in January - that's 45% of daylight hours.

How warm is the sea around Illinois in January?

The average sea temperature around Chicago, Illinois in January is 39°F.

Does it rain in Illinois in January?

There are usually 12 days with some rain in Chicago, Illinois in January and the average monthly rainfall is 1.7 inches. Rain may fall as snow in this month.

Illinois January sunrise & sunset times

Browse the sunrise and sunset times for Illinois in January 2025. Select a month to view Illinois sunrise and sunset times for the next 12 months. The Illinois sunrise and sunset times shown below are for Chicago.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st January 2025 07:18 16:31
Thursday, 16th January 2025 07:15 16:46
Friday, 31st January 2025 07:04 17:05

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