How Crowded Is Manhattan Project in June?
June is a busy month at Manhattan Project National Historical Park, running about 1.4× the park's average month — roughly 12% of the year's visitors come in June. That puts it between the July peak and the January low. Overall our best-time score rates June as "Good" for a visit. Typical June weather averages a high near 81°F and a low around 54°F, with about 1.2" of precipitation. You'll get about 14.4 hours of daylight to explore.
Frequently Asked Questions
June is busy at Manhattan Project National Historical Park (about 1.4× the average month). Our best-time score rates it "Good". The single best month overall is May.
The busiest month is July and the quietest is January. June sits at about 1.4× the park's average, or 12% of annual visitation.
Source: National Park Service Visitor Use Statistics (2016–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.