What is the weather like in Chicago vs Mammoth Cave National Park in September?

In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Mammoth Cave National Park averages 30°C high / 16°C low with about 107 mm.

Chicago vs Mammoth Cave National Park in September

Chicago is the better pick in September — 91 vs 75 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while Mammoth Cave National Park is hot, rainy, clean air.

Chicago vs Mammoth Cave National Park — September climate, side by side

	🇺🇸 Chicago	🇺🇸 Mammoth Cave National Park
Comfort score	91/100 (S)	75/100 (B)
Feels-like high	25°C	32°C
Avg high / low	25° / 17°	30° / 16°
Rainfall	63 mm	107 mm
Rainy days	7	6
Humidity	73%	69%
Air quality (AQI)	45	42

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

Month by month

Chicago vs Mammoth Cave National Park in September — FAQ

Is September better in Chicago or Mammoth Cave National Park?: Chicago is the better pick in September — 91 vs 75 on SeasonMap's comfort score. Chicago is warm, a little rain, clean air, while Mammoth Cave National Park is hot, rainy, clean air.
What is the weather like in Chicago vs Mammoth Cave National Park in September?: In September, Chicago averages 25°C high / 17°C low with about 63 mm of rain; Mammoth Cave National Park averages 30°C high / 16°C low with about 107 mm.