How Crowded Is Hopewell Furnace National Historic Site in September?

September runs about 1.4× Hopewell Furnace National Historic Site's average month, which makes it a busy month here — roughly 12% of the park's yearly visitors come in September.

In a typical September the park sees roughly 6,100 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 3rd-busiest of the park's twelve months, sitting between the August peak (1.6×) and the January low (0.3×).

On our Best Time to Visit score September rates 56/100 ("Fair"), versus the top-rated October at 47/100 — 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 76°F and an overnight low around 55°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 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 14.8-hour summer high.

Park-wide, 2024 drew 48,776 recreation visits, down 10.2% from 54,293 in 2023.