Gateway Arch National Park in August
In August, Gateway Arch National Park averages a high of 88°F and a low of 66°F, with 3.7 inches of precipitation (rain plus melted snow). About 272,000 people visit, the 3rd busiest of 12 (busy). Days are 13 hours 40 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 88° / 66°F
- Precipitation
- 3.7in
- Snow
- –in
- Daylight
- 13h 40m
- Visitors
- 272,000
- Crowds
- Busy
Best months for weather and crowds instead: March (moderate), October (quiet) and November (quiet).
Weather 1991–2020 averages at Cahokia St Louis AP, IL, 3.7 miles from the park's center, 413 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in August
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Ozark National Scenic Riverways | 88° / 63° | Very busy | Hot |
| Mammoth Cave National Park | 90° / 67° | Busy | Very hot |
| Buffalo National River | 85° / 65° | Moderate | Hot |
| Indiana Dunes National Park | 80° / 63° | Very busy | Mild, wet |
| Hot Springs National Park | 93° / 71° | Busy | Very hot |
Closures, reservations and alerts: Gateway Arch National Park on nps.gov
All twelve months at Gateway Arch · National parks to visit in August