Month-by-month travel weather
Chicago September weather
Chicago, United States · September
Think ‘light by day, layer at night’
September often feels more comfortable than mid-summer, though afternoons can still be warm.
Evenings cool down faster, and a light jacket becomes useful again.
September averages at a glance
Average low
around 13–16°C
Average high
around 22–26°C
Average precipitation
around 70–95 mm
Rainy days
about 6–9 days
What to wear in September in Chicago
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Light clothing by day + thin layer at night.
- • Optional rain option.
- • Comfortable walking shoes.
Travel tips for visiting Chicago in September
- • Lakeside evenings can feel cooler with breeze.
- • Great month for longer walks—just plan the night layer.
September weather in Chicago — FAQ
Q. Is September a good time to visit?
A. Often yes—comfortable days with cooler evenings.
Q. Does it still rain?
A. Yes, rain is still possible, though humidity often eases.
Explore Chicago
These pages are connected so you can compare conditions and decide for yourself.