Seattle Marathon
Race Day Weather
Chilly start, gradual warming trend
Runners will face a starting temperature of 36°F, gradually rising to 42°F by the finish. Humidity will be high at 78%, potentially impacting comfort levels. A light headwind will be felt from miles 1-7, making pacing adjustments crucial during these sections. As temperatures rise, runners should consider a conservative start to manage energy efficiently.
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Race Info
The Seattle Marathon starts at Seattle Center and finishes at Bell Harbor Pier 66 on the downtown waterfront. A new course introduced for the 2025 race takes runners north along Lake Union's Eastlake shore, across the Montlake Bridge, and through Interlaken Park into the Washington Park Arboretum and the University of Washington campus, then west past Gas Works Park and through Fremont before finishing on the waterfront. First run in 1970 by a group of University of Washington friends, it's the oldest marathon in the Pacific Northwest and still pairs a half marathon with the full on race morning.
