How Crowded Is Valley Forge National Historical Park in September?

September runs about 1.1× Valley Forge National Historical Park's average month, which makes it an average month here — roughly 9% of the park's yearly visitors come in September.

In a typical September the park sees about 172,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 6th-busiest of the park's twelve months, sitting between the July peak (1.5×) and the January low (0.4×).

On our Best Time to Visit score September rates 63/100 ("Good") — the single best-rated month at Valley Forge, balancing crowds against weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 79°F and an overnight low around 56°F, with about 4.4" of precipitation.

That average of about 68°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 35% 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 9.2-hour midwinter low and the 14.8-hour summer high.

Park-wide, 2025 drew 1,819,086 recreation visits, down 2.5% from 1,866,480 in 2024.

Across the past decade overall visitation has eased about 18.9%, so September may feel a touch quieter than it once did.