How Crowded Is Gateway in September?
September is a busy month at Gateway National Recreation Area, running about 1.2× the park's average month — roughly 10% of the year's visitors come in September. That puts it between the July peak and the February low. Overall our best-time score rates September as "Good" for a visit. Typical September weather averages a high near 77°F and a low around 62°F, with about 3.9" of precipitation. You'll get about 12.3 hours of daylight to explore.
Frequently Asked Questions
September is busy at Gateway National Recreation Area (about 1.2× the average month). Our best-time score rates it "Good". The single best month overall is October.
The busiest month is July and the quietest is February. September sits at about 1.2× the park's average, or 10% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.