What is the weather like in Chicago vs Indiana Dunes National Park in September?

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Indiana Dunes National Park averages 24°C high / 16°C low with about 73 mm.

Chicago vs Indiana Dunes National Park in September

Chicago is the better pick in September — 91 vs 84 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while Indiana Dunes National Park is warm, a little rain, clean air.

Chicago vs Indiana Dunes National Park — September climate, side by side

	🇺🇸 Chicago	🇺🇸 Indiana Dunes National Park
Comfort score	91/100 (S)	84/100 (A)
Feels-like high	25°C	25°C
Avg high / low	25° / 17°	24° / 16°
Rainfall	63 mm	73 mm
Rainy days	7	8
Humidity	73%	75%
Air quality (AQI)	45	43

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Chicago 🇺🇸 United Stateswarm, a little rain, clean air · best September91
Indiana Dunes National Park 🇺🇸 United Stateswarm, a little rain, clean air · best May84

Chicago vs Indiana Dunes National Park in September — FAQ

Is September better in Chicago or Indiana Dunes National Park?: Chicago is the better pick in September — 91 vs 84 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while Indiana Dunes National Park is warm, a little rain, clean air.
What is the weather like in Chicago vs Indiana Dunes National Park in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Indiana Dunes National Park averages 24°C high / 16°C low with about 73 mm.