Temperature in Illinois in January

Daytime highs, nighttime lows and the warmest cities in Illinois, the United States of America this January.

Illinois, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in January ranging from -2°C (28°F) in Galena to 6°C (43°F) in Metropolis. Nighttime temperatures generally drop to -4°C (25°F) in Metropolis and -12°C (10°F) in Galena. In January, it is winter. On average, it is one of the coldest months of the year.

What is the temperature of the different cities in Illinois, the United States of America in January?

Find the average daytime temperatures in January for the most popular destinations in Illinois on the map below. Click on a destination dot for more detailed information.

Select a Month

Check the conditions for any month of the year.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

For a detailed overview over the year and the best time to visit Illinois, check out our Illinois's climate page.

See also: Illinois weather by month.

Best Places to Visit in Illinois in January

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Illinois.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in January: blue is cold, red is hot.

See all January weather averages, cities and regions in Illinois

Illinois temperatures in January: frequently asked questions

How hot does it get in Illinois, the United States of America in January?

Chicago averages a daytime high of -1°C (30°F) in January, which is very low for Illinois, the United States of America.

How cold does it get at night in Illinois, the United States of America in January?

Chicago sees nighttime lows close to -9°C (16°F) in January.

What is the warmest city in January in Illinois, the United States of America?

Based on our systematic data collection, Metropolis has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 6°C (43°F), while at night it goes down to an approximate temperature of -4°C (25°F).

What is the coldest city in January in Illinois, the United States of America?

According to our data, Galena holds the title for the coldest city in Illinois, the United States of America in January. It experiences maximum temperatures of approximately -2°C (28°F) and drops to lows of about -12°C (10°F) during the night.

How much sun does Illinois, the United States of America get in January?

Most cities enjoy a balanced amount of sunshine, with around 133 hours of sunlight anticipated in Chicago. This ensures the days are neither too dim nor excessively sunny.

Interested in more climate information?

We have much more information about the climate in Illinois.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

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