How Crowded Is Rosie the Riveter WWII Home Front National Historical Park in September?

September runs about 0.9× Rosie the Riveter WWII Home Front National Historical Park's average month, which makes it an average month here — roughly 8% of the park's yearly visitors come in September.

In a typical September the park sees roughly 3,700 recreation visits, based on National Park Service monthly counts from 2013 to 2025.

That makes September the 8th-busiest of the park's twelve months, sitting between the July peak (1.2×) and the January low (0.7×).

On our Best Time to Visit score September rates 73/100 ("Good"), versus the top-rated October at 70/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 75°F and an overnight low around 56°F.

That average of about 65°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 29% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.2 hours of daylight in September to explore — between the 9.4-hour midwinter low and the 14.6-hour summer high.

Park-wide, 2024 drew 34,913 recreation visits, down 12.5% from 39,883 in 2023.

Across the past decade overall visitation has eased about 14.8%, so September may feel a touch quieter than it once did.