Chicago Weather in September
United States · 30-year monthly averages
🌟 Great time to visit
September in Chicago is pleasantly warm, with average daytime highs around 25°C (76°F) and nighttime lows near 15°C (59°F). Expect roughly 70mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
Avg high
25°C
76°F
Avg low
15°C
59°F
Rainfall
70mm
moderate
Rainy days
7
days with ≥1mm
🎒 What to pack
- light layers
- comfortable walking shoes
September vs the rest of the year
FAQ
- How hot is Chicago in September?
- September in Chicago is pleasantly warm, with average daytime highs around 25°C (76°F) and nighttime lows near 15°C (59°F). Expect roughly 70mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
- Does it rain a lot in Chicago in September?
- Chicago sees around 70mm of precipitation in September on average — moderate by global standards.
- Is September a good time to visit Chicago?
- September is one of the best months to visit Chicago — comfortable temperatures and manageable rainfall.