What is the weather like in Indiana Dunes National Park vs St. Louis in September?

In September, Indiana Dunes National Park averages 24°C high / 16°C low with about 73 mm of rain; St. Louis averages 29°C high / 15°C low with about 83 mm.

Indiana Dunes National Park vs St. Louis in September

Indiana Dunes National Park and St. Louis are nearly tied in September — 84 vs 85 on SeasonMap's comfort score. Indiana Dunes National Park is warm, a little rain, clean air; St. Louis is hot, rainy, clean air.

Indiana Dunes National Park vs St. Louis — September climate, side by side

	🇺🇸 Indiana Dunes National Park	🇺🇸 St. Louis
Comfort score	84/100 (A)	85/100 (A)
Feels-like high	25°C	30°C
Avg high / low	24° / 16°	29° / 15°
Rainfall	73 mm	83 mm
Rainy days	8	5
Humidity	75%	67%
Air quality (AQI)	43	50

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

Month by month

Indiana Dunes National Park vs St. Louis in September — FAQ

Is September better in Indiana Dunes National Park or St. Louis?: Indiana Dunes National Park and St. Louis are nearly tied in September — 84 vs 85 on SeasonMap's comfort score. Indiana Dunes National Park is warm, a little rain, clean air; St. Louis is hot, rainy, clean air.
What is the weather like in Indiana Dunes National Park vs St. Louis in September?: In September, Indiana Dunes National Park averages 24°C high / 16°C low with about 73 mm of rain; St. Louis averages 29°C high / 15°C low with about 83 mm.