How Crowded Is Keweenaw in September?
September is a very busy month at Keweenaw National Historical Park, running about 1.9× the park's average month — roughly 16% of the year's visitors come in September. That puts it between the August peak and the January low. Overall our best-time score rates September as "Fair" for a visit. Typical September weather averages a high near 66°F and a low around 47°F. You'll get about 12.3 hours of daylight to explore.
Frequently Asked Questions
September is very busy at Keweenaw National Historical Park (about 1.9× the average month). Our best-time score rates it "Fair". The single best month overall is May.
The busiest month is August and the quietest is January. September sits at about 1.9× the park's average, or 16% of annual visitation.
Source: National Park Service Visitor Use Statistics (2016–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.