How Crowded Is George Rogers Clark National Historical Park in August?

August runs about 1.3× George Rogers Clark 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 about 13,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

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

On our Best Time to Visit score August rates 66/100 ("Good"), versus the top-rated October at 66/100 — 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 88°F and an overnight low around 64°F, with about 3.3" of precipitation.

That average of about 76°F is warm enough that midday heat is worth planning around.

August falls inside the park's busiest stretch: June, July and August together pull about 38% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.

You'll have about 13.5 hours of daylight in August to explore — between the 9.3-hour midwinter low and the 14.7-hour summer high.

Park-wide, 2025 drew 113,397 recreation visits, down 31.9% from 166,621 in 2024.

Across the past decade overall visitation has risen about 18.6%, so a August visit is likely to feel busier than it did a few years ago.