How Crowded Is Manhattan Project National Historical Park in August?

August runs about 1.4× Manhattan Project National Historical Park's average month, which makes it a busy month here — roughly 11% of the park's yearly visitors come in August.

In a typical August the park sees roughly 7,400 recreation visits, based on National Park Service monthly counts from 2016 to 2025.

That makes August the 3rd-busiest of the park's twelve months, sitting between the July peak (1.7×) and the January low (0.3×).

On our Best Time to Visit score August rates 59/100 ("Fair"), versus the top-rated May at 56/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical August weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 80°F and an overnight low around 55°F, with about 3.2" of precipitation.

That average of about 67°F is a comfortable range for hiking and being outdoors all day.

August falls inside the park's busiest stretch: June, July and August together pull about 37% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.

You'll have about 13.4 hours of daylight in August to explore — between the 9.6-hour midwinter low and the 14.4-hour summer high.

Park-wide, 2025 drew 56,390 recreation visits, down 24.5% from 74,693 in 2024.

Across the past decade overall visitation has eased about 43.1%, so August may feel a touch quieter than it once did.