How Crowded Is San Juan Island in October?
October is a quiet month at San Juan Island National Historical Park, running about 0.7× the park's average month — roughly 6% of the year's visitors come in October. That puts it between the July peak and the January low. Overall our best-time score rates October as "Fair" for a visit. Typical October weather averages a high near 59°F and a low around 44°F, with about 2.3" of precipitation. You'll get about 10.5 hours of daylight to explore.
Frequently Asked Questions
October is quiet at San Juan Island National Historical Park (about 0.7× 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. October sits at about 0.7× the park's average, or 6% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-06-20.