Ghost of Seattle Half Marathon
Race Day Weather
Cool start — fast day potential, chance of rain
A cool 40°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Light winds shouldn't be a major factor for pacing. There's a chance of rain, so have a backup gear plan ready. High humidity (82%) will make it harder to cool down through sweat — increase fluid intake accordingly.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Ghost of Seattle Half 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 Ghost Half Marathon is a single 13.1-mile loop on the Saturday of race weekend, starting and finishing at the Ferdinand Street Boat Launch on Lake Washington Boulevard. The route runs south and circles Seward Park clockwise, then heads north through Leschi to a turnaround past Madrona Drive before returning along the lake. The course is flat, run on streets and sidewalks beside Lake Washington.