How Crowded Is Thomas Edison National Historical Park in September?

September runs about 0.8× Thomas Edison National Historical Park's average month, which makes it a quiet month here — roughly 7% of the park's yearly visitors come in September.

In a typical September the park sees roughly 3,200 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 9th-busiest of the park's twelve months, sitting between the August peak (1.6×) and the January low (0.6×).

On our Best Time to Visit score September rates 75/100 ("Excellent") — the single best-rated month at Thomas Edison, balancing crowds against weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 78°F and an overnight low around 54°F, with about 4.5" of precipitation.

That average of about 66°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 37% 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 12.3 hours of daylight in September to explore — between the 9.1-hour midwinter low and the 14.9-hour summer high.

Park-wide, 2021 drew 14,807 recreation visits, down 64.9% from 42,224 in 2019.

Across the past decade overall visitation has eased about 15.6%, so September may feel a touch quieter than it once did.