How Crowded Is Marsh - Billings - Rockefeller in September?
September is a very busy month at Marsh - Billings - Rockefeller National Historical Park, running about 1.8× the park's average month — roughly 15% 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 "Fair" for a visit. Typical September weather averages a high near 73°F and a low around 47°F, with about 3.6" of precipitation. You'll get about 12.3 hours of daylight to explore.
Frequently Asked Questions
September is very busy at Marsh - Billings - Rockefeller National Historical Park (about 1.8× the average month). Our best-time score rates it "Fair". The single best month overall is May.
The busiest month is October and the quietest is January. September sits at about 1.8× the park's average, or 15% of annual visitation.
Source: National Park Service Visitor Use Statistics (1998–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.