How Crowded Is Lewis and Clark in August?
August is a very busy month at Lewis and Clark National Historical Park, running about 1.8× the park's average month — roughly 15% of the year's visitors come in August. That puts it between the July peak and the December low. Overall our best-time score rates August as "Fair" for a visit. Typical August weather averages a high near 69°F and a low around 54°F, with about 1.1" of precipitation. You'll get about 14.0 hours of daylight to explore.
Frequently Asked Questions
August is very busy at Lewis and Clark National Historical Park (about 1.8× the average month). Our best-time score rates it "Fair". The single best month overall is May.
The busiest month is July and the quietest is December. August sits at about 1.8× the park's average, or 15% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.