How Crowded Is Johnstown Flood National Memorial in September?

September runs about 1.3× Johnstown Flood National Memorial's average month, which makes it a busy month here — roughly 11% of the park's yearly visitors come in September.

In a typical September the park sees about 16,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 5th-busiest of the park's twelve months, sitting between the July peak (1.8×) and the January low (0.1×).

On our Best Time to Visit score September rates 52/100 ("Fair"), versus the top-rated June at 68/100 — 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 71°F and an overnight low around 53°F, with about 4" of precipitation.

That average of about 62°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 38% 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, 2025 drew 74,977 recreation visits, down 21.8% from 95,842 in 2024.

Across the past decade overall visitation has eased about 23.5%, so September may feel a touch quieter than it once did.