How Crowded Is John Muir in September?
September is an average month at John Muir National Historic Site, running about 0.9× the park's average month — roughly 7% of the year's visitors come in September. That puts it between the April peak and the December low. Overall our best-time score rates September as "Excellent" for a visit. Typical September weather averages a high near 84°F and a low around 50°F, with about 0.1" of precipitation. You'll get about 12.2 hours of daylight to explore.
Frequently Asked Questions
September is average at John Muir National Historic Site (about 0.9× the average month). Our best-time score rates it "Excellent". The single best month overall is September.
The busiest month is April and the quietest is December. September sits at about 0.9× the park's average, or 7% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.