How Crowded Is Cumberland Island in September?
September is a quiet month at Cumberland Island National Seashore, running about 0.6× the park's average month — roughly 5% of the year's visitors come in September. That puts it between the March peak and the January low. Overall our best-time score rates September as "Good" for a visit. Typical September weather averages a high near 85°F and a low around 71°F, with about 5.2" of precipitation. You'll get about 12.2 hours of daylight to explore.
Frequently Asked Questions
September is quiet at Cumberland Island National Seashore (about 0.6× the average month). Our best-time score rates it "Good". The single best month overall is October.
The busiest month is March and the quietest is January. September sits at about 0.6× the park's average, or 5% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.