Illinois weather in January 2025

Expect -1°C 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.

-1
-1°C max day temperature
4
4 hours of sunshine per day
12
12 days with some rainfall
-10
-10°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
44
44 mm of monthly rainfall
1
1 (Low) UV index
4
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.

Top Illinois destinations

Below are average maximum temperatures at popular destinations in Illinois in January. Select a destination to see more weather parameters.

1
Springfield
-1
Chicago

All Illinois destinations

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

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How cold is it in Illinois in January?

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

Is the sea cold around Illinois in January?

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

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 44mm. 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.