This post is about the Chicago weather in October, including what to expect with temperatures, rain, and tips on what to wear and things to do.
The weather in Chicago during the month of October is changeable with autumn now in full swing as temperatures are falling, but not yet at those colder winter levels so it is still a good time to visit the nation’s third most populous city.
Early in the month, the afternoon temperatures are still pleasant reaching into the upper 60s f (about 20C) with overnight and early morning lows dipping into the upper 40s f (about 9C). A few days during the early part of this month may see temperatures in the 70s f (21-26C) or even into the lower 80s f (27-28C).
The temperatures will fall as the month progresses with afternoon temperatures dropping into the mid-50s f range (13-14C) and morning lows to near 40f (about 4C) by month’s end. On about 2-3 of the colder mornings, early risers will see lows at or just below 32f (0C).
Skies can be expected to be clear or partly sunny on about 17-18 days this month with mostly cloudy conditions likely on 13-14 days.
Rain normally falls on 8-9 days this month, however, significant rainfalls of 0.5 inch (about 13mm) or more occur, on average, only on about 2 days.
Snow can occur in October; however, it is not normally an issue. Chicago only sees a dusting of snow about once every 5 years and a snowfall of 1 inch or more about once in 10 years.
It would be best to bring a sweater or two. Early in the month, a sweater may be all you need. However, as the month progresses, you may want to add some layers with a medium weight jacket a welcome addition to add to that sweater on the colder days or when touring near the Lake Michigan.