Month-by-month travel weather
Chicago August weather
Chicago, United States · August
Hot days and cooler-feeling nights can mix
August often stays hot and humid, though late-month evenings can start to feel slightly easier.
Storms and rain can shift the feel briefly, but humidity can return quickly.
August averages at a glance
Average low
around 18–21°C
Average high
around 27–30°C
Average precipitation
around 80–105 mm
Rainy days
about 7–10 days
What to wear in August in Chicago
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Breathable clothing + optional rain option.
- • Optional thin indoor layer for A/C.
- • A light layer can help on breezier evenings.
Travel tips for visiting Chicago in August
- • On hotter days, walk more in morning/evening windows.
- • After storms, transit can feel more crowded or delayed.
August weather in Chicago — FAQ
Q. Is August cooler than July?
A. Sometimes slightly, but hot days can still be common.
Q. Are nights cooler?
A. They can be, but humid warm nights also happen.
Explore Chicago
These pages are connected so you can compare conditions and decide for yourself.