How Crowded Is Muir Woods in September?
September is an average month at Muir Woods National Monument, 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 February low. Overall our best-time score rates September as "Excellent" for a visit. Typical September weather averages a high near 82°F and a low around 53°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 Muir Woods National Monument (about 1.1× the average month). Our best-time score rates it "Excellent". The single best month overall is October.
The busiest month is July and the quietest is February. September sits at about 1.1× the park's average, or 9% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.