Gateway Arch National Park in July
Gateway Arch National Park · crowd + weather almanac
July crowd level
busiest stretch
about 470,000 visits in a
typical July
The busiest month of the year ·
median of 2016–2025 official NPS counts
July is the busiest month of the year at Gateway Arch National Park: about 470,000 recreation visits in a typical July (27% of the year's traffic). This is high season — the park is at or near its busiest. Weather-wise, July days at the Cahokia, IL station typically top out around 88°F with nights near 69°F, and about 5.0 inches of precipitation falls over the month.
- Typical July: 470,489 recreation visits (median 2016–2025); the range across those years ran 33,748 (2020) to 634,978 (2018).
- Busier than 11 of the other 11 months.
- 1991–2020 July normals at Cahokia, IL: high 88°F, low 69°F, 5.02 in precipitation, 0.0 in snow.
- Similar daytime temperatures, thinner crowds: August typically runs 87°F days with about 55% fewer visits (213,000 vs 470,000).
July weather (1991–2020 normals)
| Typical daytime high | 88°F |
|---|---|
| Typical overnight low | 69°F |
| Precipitation (monthly normal) | 5.02 in |
| Snowfall (monthly normal) | 0.0 in |
| Measured at | Cahokia, IL (USC00111160), 4.0 mi from the park reference point, elev. 400 ft |
Every month at Gateway Arch
| Month | Typical visits | Crowds | High / Low | Precip |
|---|---|---|---|---|
| January | 39,056 | quietest stretch | 41°F / 22°F | 2.7 in |
| February | 51,742 | quietest stretch | 46°F / 26°F | 2.3 in |
| March | 121,804 | quiet | 56°F / 35°F | 3.5 in |
| April | 109,703 | quiet | 68°F / 45°F | 4.6 in |
| May | 140,929 | quiet | 76°F / 56°F | 4.8 in |
| June | 209,875 | moderate | 85°F / 65°F | 4.3 in |
| July | 470,489 | busiest stretch | 88°F / 69°F | 5.0 in |
| August | 213,218 | moderate | 87°F / 67°F | 3.1 in |
| September | 124,285 | quiet | 80°F / 59°F | 3.4 in |
| October | 117,702 | quiet | 70°F / 46°F | 3.0 in |
| November | 89,065 | quiet | 56°F / 35°F | 3.3 in |
| December | 70,685 | quiet | 45°F / 27°F | 2.8 in |