Search flights, hotels & activities for Illinois
Compare flights, hotels, cars, and activities in one place.
500+airlines & travel sites compared
21,000+routes tracked
€0booking fees from us
Freeprice drop alerts
Things to Do in Illinois in September
Real historical weather for Illinois in September: average highs of 27°C and lows of 16°C, with around 57mm of rain (averaged over the last 3 years).
27°C
Average high
16°C
Average low
57mm
Typical rainfall
Real things to do in Illinois in September
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Illinois Holocaust Museum Experience360 Admission
★ 5.0(26 reviews)· 2 hrs
From €11
Skip the Line: Public Tour-Adult Admission Ticket (50 mins)
★ 4.9(15 reviews)· 50 min
From €18
Museum of Illusions Chicago Admission Ticket
★ 4.8(5 reviews)· 1h 30m
From €38
Frank Lloyd Wright's Home & Studio Tour Ticket
★ 4.7(147 reviews)· 1 hr
From €24
Frank Lloyd Wright Tour in Oak Park
★ 4.6(15 reviews)· 1 hr
From €31
Lakefront Segway Tour in Chicago
★ 4.6(147 reviews)· 1h 30m
From €56
Murder Mystery Detective Experience in Springfield IL
★ 4.0(8 reviews)· 2h 30m
From €13
Springfield Self-Guided Walking Audio Tour
★ 4.0(5 reviews)· 2 hrs
From €13
Lake Michigan and Chicago River Cruise Ticket
· 1h 30m
From €53
Hike the Illinois Dunes
· 2h 15m
From €40
Real listings from Viator, including live ratings and prices — clicking through takes you to book directly.
Plan the rest of your trip
Continue planning your trip to Illinois
Same destination, real availability — no need to search again.
FAQs — Illinois in September
Based on real historical data (averaged over the last 3 years), expect highs around 27°C and lows around 16°C, with roughly 57mm of rain.