Chicago weather in January 2026

Expect -1°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Chicago in January based on long-term weather averages. There is usually 12 days with some rainfall and 44 mm of average monthly rainfall in January.

  • -1°C maximum daytime temperature in January in Chicago-1
    -1°C max day temperature
  • 4 hours of sunshine per day
  • 12 days with some rainfall in January in Chicago12
    12 days with some rainfall
  • -10°C minimum night-time temperature in January in Chicago-10
    -10°C min night temperature
  • 10 hours of daylight per day in January in Chicago10
    10 hours of daylight per day
  • No heat & humidity in January in Chicago0
    No heat & humidity
  • 44 mm monthly rainfall in January in Chicago44
    44 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Chicago1
    1 (Low) UV index
  • 4°C sea temperature in January in Chicago4
    4°C 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.

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

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More about the USA

How cold is it in Chicago in January?

Daytime temperatures usually reach -1°C in Chicago in January, falling to -10°C at night.

How sunny is it in Chicago in January?

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

Is the sea cold around Chicago in January?

The average sea temperature around Chicago in January is 4°C.

Does it rain in Chicago in January?

There are usually 12 days with some rain in Chicago in January and the average monthly rainfall is 44mm. Rain may fall as snow in this month.

Chicago January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:18 16:30
Friday, 16th January 2026 07:15 16:46
Saturday, 31st January 2026 07:04 17:05

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