Chicago weather in October

Long-run climate averages for Chicago, IL in October, plus what the forecast models say for the days ahead.

October at a glance

In October, Chicago averages 64°F by day and 49°F at night. The wettest month is usually July.

October in Chicago averages a daytime high of 64°F and an overnight low of 49°F, which reads as mild for this part of the world. Across the whole year Chicago sees roughly 45 inches of precipitation.

Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Chicago forecast with every model compared and how much they currently agree.

Chicago weather by month

what to expect in Chicago through the year

Here is Chicago's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Chicago by season.

Jan

34°

23°

Cold

Feb

43°

27°

Cool

Mar

47°

32°

Cool

Apr

59°

41°

Mild

May

68°

51°

Mild

Jun

79°

62°

Warm

Jul

80°

65°

Warm

Wettest

Aug

80°

65°

Warm

Sep

75°

61°

Warm

Oct

64°

49°

Mild

Nov

50°

38°

Cool

Dec

40°

30°

Cool

Common questions

How warm is Chicago in October?

Chicago averages a daytime high of 64°F in October, with overnight lows around 49°F. These are long-run climate averages, not a forecast — for the actual days ahead see the live model comparison.

Is October a good time to visit Chicago?

The most comfortable time to visit Chicago is usually May, September and October, when daytime highs sit in the pleasant 60-78°F range and the heaviest July rain is behind you.

Does it rain a lot in Chicago in October?

The wettest month in Chicago is usually July. Across the year the city sees roughly 45 inches of precipitation.

Chicago in other months

January February March April May June July August September November December

More about Chicago

Chicago live forecast Best time to visit Chicago Which forecast is most accurate in United States?