Gateway Arch National Park in May
In May, Gateway Arch National Park averages a high of 77°F and a low of 57°F, with 4.8 inches of precipitation (rain plus melted snow). About 222,000 people visit, the 4th busiest of 12 (moderate). Days are 14 hours 15 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 77° / 57°F
- Precipitation
- 4.8in
- Snow
- –in
- Daylight
- 14h 15m
- Visitors
- 222,000
- Crowds
- Moderate
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 May
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Ozark National Scenic Riverways | 78° / 51° | Moderate | Mild, wet |
| Mammoth Cave National Park | 81° / 57° | Busy | Hot |
| Buffalo National River | 72° / 54° | Very busy | Mild, wet |
| Indiana Dunes National Park | 68° / 50° | Busy | Mild, wet |
| Hot Springs National Park | 80° / 60° | Busy | Hot |
Closures, reservations and alerts: Gateway Arch National Park on nps.gov
All twelve months at Gateway Arch · National parks to visit in May