How Crowded Is Arches in September?
September is a busy month at Arches National Park, running about 1.4× the park's average month — roughly 12% of the year's visitors come in September. That puts it between the June peak and the January low. Overall our best-time score rates September as "Fair" for a visit. Typical September weather averages a high near 87°F and a low around 58°F, with about 0.9" of precipitation. You'll get about 12.2 hours of daylight to explore.
Frequently Asked Questions
September is busy at Arches National Park (about 1.4× the average month). Our best-time score rates it "Fair". The single best month overall is October.
The busiest month is June and the quietest is January. September sits at about 1.4× the park's average, or 12% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.