What is the weather like in Gateway Arch National Park vs St. Louis in September?

In September, Gateway Arch National Park averages 29°C high / 15°C low with about 89 mm of rain; St. Louis averages 29°C high / 15°C low with about 83 mm.

Gateway Arch National Park vs St. Louis in September

St. Louis is the better pick in September — 85 vs 81 on SeasonMap's comfort score. St. Louis is hot, rainy, clean air, while Gateway Arch National Park is hot, rainy, clean air.

Gateway Arch National Park vs St. Louis — September climate, side by side

	🇺🇸 Gateway Arch National Park	🇺🇸 St. Louis
Comfort score	81/100 (A)	85/100 (A)
Feels-like high	30°C	30°C
Avg high / low	29° / 15°	29° / 15°
Rainfall	89 mm	83 mm
Rainy days	5	5
Humidity	67%	67%
Air quality (AQI)	50	50

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

Month by month

Gateway Arch National Park vs St. Louis in September — FAQ

Is September better in Gateway Arch National Park or St. Louis?: St. Louis is the better pick in September — 85 vs 81 on SeasonMap's comfort score. St. Louis is hot, rainy, clean air, while Gateway Arch National Park is hot, rainy, clean air.
What is the weather like in Gateway Arch National Park vs St. Louis in September?: In September, Gateway Arch National Park averages 29°C high / 15°C low with about 89 mm of rain; St. Louis averages 29°C high / 15°C low with about 83 mm.