Weather · Chicago, United States
Chicago Weather in September
September in Chicago averages 24°C by day and 16°C at night, with about 103mm of rain. That makes it one of the best months to visit.
Avg high
24°C
75°F
Avg low
16°C
61°F
Rainfall
103mm
#5 wettest of 12
What to pack
Summer clothes by day; a light layer for evenings. Bring a compact umbrella for the odd shower.
Timing a trip around the weather? A Local Friend in Chicago builds it around the season for you.