How Crowded Is San Antonio Missions in September?
September is an average month at San Antonio Missions National Historical Park, running about 1.1× the park's average month — roughly 9% of the year's visitors come in September. That puts it between the July peak and the November low. Overall our best-time score rates September as "Poor" for a visit. Typical September weather averages a high near 91°F and a low around 71°F, with about 3.2" of precipitation. You'll get about 12.2 hours of daylight to explore.
Frequently Asked Questions
September is average at San Antonio Missions National Historical Park (about 1.1× the average month). Our best-time score rates it "Poor". The single best month overall is February.
The busiest month is July and the quietest is November. September sits at about 1.1× the park's average, or 9% of annual visitation.
Source: National Park Service Visitor Use Statistics (1983–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.