How Crowded Is Upper Delaware Scenic & Recreational River in September?

September runs about 1.8× Upper Delaware Scenic & Recreational River's average month, which makes it a very busy month here — roughly 15% of the park's yearly visitors come in September.

In a typical September the park sees about 41,000 recreation visits, based on National Park Service monthly counts from 1980 to 2025.

That makes September the 3rd-busiest of the park's twelve months, sitting between the July peak (2.9×) and the December low (0.2×).

On our Best Time to Visit score September rates 56/100 ("Fair"), versus the top-rated June at 69/100 — best overall balance of crowds, weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 74°F and an overnight low around 49°F, with about 4.7" 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 59% 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-hour midwinter low and the 15-hour summer high.

Park-wide, 2025 drew 380,245 recreation visits, up 0.8% from 377,061 in 2024.

Across the past decade overall visitation has risen about 34.9%, so a September visit is likely to feel busier than it did a few years ago.