How Crowded Is Whitman Mission National Historic Site in August?

August runs about 1.1× Whitman Mission National Historic Site's average month, which makes it an average month here — roughly 9% of the park's yearly visitors come in August.

In a typical August the park sees roughly 4,400 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes August the 7th-busiest of the park's twelve months, sitting between the May peak (1.7×) and the December low (0.3×).

On our Best Time to Visit score August rates 71/100 ("Good") — the single best-rated month at Whitman Mission, balancing crowds against weather and daylight.

Typical August weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 90°F and an overnight low around 52°F, with about 0.4" of precipitation.

That average of about 71°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 33% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.

You'll have about 14 hours of daylight in August to explore — between the 8.5-hour midwinter low and the 15.5-hour summer high.

Park-wide, 2025 drew 54,089 recreation visits, down 11.8% from 61,331 in 2024.

Across the past decade overall visitation has risen about 12.1%, so a August visit is likely to feel busier than it did a few years ago.