How Crowded Is Assateague Island in September?
September is a busy month at Assateague Island National Seashore, running about 1.3× the park's average month — roughly 11% of the year's visitors come in September. That puts it between the July peak and the December low. Overall our best-time score rates September as "Good" for a visit. Typical September weather averages a high near 80°F and a low around 64°F, with about 4.5" of precipitation. You'll get about 12.2 hours of daylight to explore.
Frequently Asked Questions
September is busy at Assateague Island National Seashore (about 1.3× the average month). Our best-time score rates it "Good". The single best month overall is October.
The busiest month is July and the quietest is December. 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.