Gateway Arch · September
Gateway Arch in September
September is a good time to visit Gateway Arch — quieter than August, busier than October.
Crowd score
How busy it gets
A comfortable middle ground: some company on popular trails, but no gridlock.
About 35% of this park's busiest month.
Source: NPS Visitor Use Statistics, 2023–2025
Data: NPS visitation 2023–2025 · crowd scores computed Jul 2026. How this is calculated →
Computed from federal data · Methodology by Sharon Ben-Moshe
Visitation
Typical September visits vs. the year
Typical monthly recreation visits, averaged over the most recent three full years.
Source: NPS Visitor Use Statistics, 2023–2025
Weather
September weather
- Avg high
- 80°F
- Avg low
- 59°F
- Precipitation
- 3.4"
- Sunrise
- 5:42 AM
- Sunset
- 6:08 PM
- Daylight
- 12.4h
Source: NOAA 1991–2020 climate normals, CAHOKIA, IL US
What's open
Gateway Arch in September: access
The Gateway Arch is open year-round, closed only on Thanksgiving, Christmas, and New Year’s Day. Summer Hours (9am-6pm, Sunday through Thursday and 9am-8pm Friday and Saturday) run the Friday before Memorial Day through Labor Day weekend and are the primary visitor season. During Regular Hours (the day after Labor Day through Friday before Memorial Day) we are open from 9am to 6pm. Around the holidays we occasionally have extended hours.
No seasonal road or area closures reported for this park.
Source: NPS Data API
Conditions
Current alerts
No current alerts or closures reported for this park.
Source: NPS Data API
Context
Gateway Arch crowds across the year
FAQ
Gateway Arch in September
How busy is Gateway Arch in September?
September rates 4/10 for crowds (Moderate) at Gateway Arch National Park — about 35% of its busiest month. Typical recreation visits: 170,689.
What is the weather like at Gateway Arch in September?
In September, Gateway Arch averages a high of 80°F and a low of 59°F, with about 3.4 inches of precipitation.