Gateway Arch in May: Crowds, Weather & What to Pack
Shoulder · VisitWhen score 78/100 · #4 of 12 months
May is a solid shoulder-season month to visit Gateway Arch National Park: crowds run 36% of the July peak (170,789 average visits), days average 77°F with 14.3 hours of daylight. Computed from NPS and NOAA data.
Crowds in May
Gateway Arch averages 170,789 recreation visits in May — 36% of what July, the peak month, draws. Trailheads and parking fill accordingly.
Weather & daylight
Days are mild (highs average 77°F), and nights stay mild (lows average 57°F). This is one of the wetter months (4.8″ of precipitation on average). Mid-month daylight runs 14.3 hours.
NOAA 1991–2020 monthly normals, station CAHOKIA ST LOUIS AP, IL US (4 mi from park coordinates, 413 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of May.
What to pack for Gateway Arch in May
Computed from the month's weather normals above — not a generic list.
- Rain shell + pack cover — 4.8″ of precipitation is normal this month
- Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
If your dates are flexible, consider shifting: The computed best months for Gateway Arch are April and September.
Common questions
Is Gateway Arch crowded in May?
No — May is one of the quieter months: 36% of the July peak, averaging 170,789 visits (NPS, 2021–2025).
What is the weather like in Gateway Arch in May?
Average highs of 77°F, lows of 57°F, 4.8″ of precipitation (NOAA 1991–2020 normals, CAHOKIA ST LOUIS AP, IL US station).
What should I pack for Gateway Arch in May?
Rain shell + pack cover; Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page.
See also: the best national parks to visit in May · Last verified 2026-07-16