How Crowded Is San Juan Island in June?
June is a busy month at San Juan Island National Historical Park, running about 1.6× the park's average month — roughly 13% 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 "Fair" for a visit. Typical June weather averages a high near 68°F and a low around 48°F, with about 0.8" of precipitation. You'll get about 15.9 hours of daylight to explore.
Frequently Asked Questions
June is busy at San Juan Island National Historical Park (about 1.6× the average month). Our best-time score rates it "Fair". The single best month overall is April.
The busiest month is July and the quietest is January. June sits at about 1.6× the park's average, or 13% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.