Seattle Marathon
Race Day Weather
Cold start, steady finish
Runners will face a chilly start at 36°F, warming to 40°F by the finish. With a light headwind in the first few miles and a switch to tailwind later, pacing adjustments will be crucial, especially during the exposed stretches. Given the average humidity of 78%, maintaining hydration is essential, and runners should dress in layers to stay warm during the pre-race wait.
Pace Calculator
Get forecast alerts for Seattle Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
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.
