How Crowded Is World War II Memorial in September?

September runs about 1× World War II Memorial'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 373,000 recreation visits, based on National Park Service monthly counts from 2004 to 2025.

That makes September the 8th-busiest of the park's twelve months, sitting between the May peak (1.5×) and the January low (0.4×).

On our Best Time to Visit score September rates 59/100 ("Fair") — the single best-rated month at World War II Memorial, balancing crowds against weather and daylight.

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 81°F and an overnight low around 64°F, with about 3.9" of precipitation.

That average of about 72°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 31% 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 9.3-hour midwinter low and the 14.7-hour summer high.

Park-wide, 2025 drew 3,993,717 recreation visits, down 22.6% from 5,160,769 in 2024.

Across the past decade overall visitation has risen about 7.9%, so a September visit is likely to feel busier than it did a few years ago.