How Crowded Is Alibates Flint Quarries in September?
September is a busy month at Alibates Flint Quarries National Monument, running about 1.3× the park's average month — roughly 11% of the year's visitors come in September. That puts it between the October peak and the January low. Overall our best-time score rates September as "Good" for a visit. Typical September weather averages a high near 87°F and a low around 57°F, with about 1.6" of precipitation. You'll get about 12.2 hours of daylight to explore.
Frequently Asked Questions
September is busy at Alibates Flint Quarries National Monument (about 1.3× the average month). Our best-time score rates it "Good". The single best month overall is April.
The busiest month is October and the quietest is January. September sits at about 1.3× the park's average, or 11% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.