Temperature in Illinois in October

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

Illinois, the United States of America, a region in the United States of America, experiences maximum daytime temperatures in October ranging from 14°C (57°F) in Roscoe to 21°C (70°F) in Metropolis. Nighttime temperatures generally drop to 8°C (46°F) in Metropolis and 3°C (37°F) in Roscoe.

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

Find the average daytime temperatures in October 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.

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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 October

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 October: blue is cold, red is hot.

See all October weather averages, cities and regions in Illinois

Illinois temperatures in October: frequently asked questions

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

Average daytime highs in Illinois, the United States of America during October reach about 17°C (63°F) in Chicago.

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

Nighttime temperatures in Chicago typically drop to around 7°C (45°F) in October.

What is the warmest city in October 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 21°C (70°F), while at night it goes down to an approximate temperature of 8°C (46°F).

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

When looking through our records, we find that Roscoe stands out as the coolest city in Illinois, the United States of America for the month of October. Daytime highs average 14°C (57°F) and it cools down to about 3°C (37°F) at night.

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

Chicago usually sees around 195 hours of sunlight, indicating many sunny days.

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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