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

In September, Indianapolis averages 27°C high / 16°C low with about 64 mm of rain; Mammoth Cave National Park averages 30°C high / 16°C low with about 107 mm.

Indianapolis vs Mammoth Cave National Park in September

Indianapolis is the better pick in September — 89 vs 75 on SeasonMap's comfort score. Indianapolis is warm, a little rain, clean air, while Mammoth Cave National Park is hot, rainy, clean air.

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

	🇺🇸 Indianapolis	🇺🇸 Mammoth Cave National Park
Comfort score	89/100 (A)	75/100 (B)
Feels-like high	28°C	32°C
Avg high / low	27° / 16°	30° / 16°
Rainfall	64 mm	107 mm
Rainy days	5	6
Humidity	68%	69%
Air quality (AQI)	42	42

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

Month by month

Indianapolis vs Mammoth Cave National Park in September — FAQ

Is September better in Indianapolis or Mammoth Cave National Park?: Indianapolis is the better pick in September — 89 vs 75 on SeasonMap's comfort score. Indianapolis is warm, a little rain, clean air, while Mammoth Cave National Park is hot, rainy, clean air.
What is the weather like in Indianapolis vs Mammoth Cave National Park in September?: In September, Indianapolis averages 27°C high / 16°C low with about 64 mm of rain; Mammoth Cave National Park averages 30°C high / 16°C low with about 107 mm.