Seattle Marathon

Seattle, WA, USA · November 29, 2026

40°·47° high·Light·Dry

Weather

Race Day Weather

40°at start

47° high

Light

Dry

Cool start, steady crosswinds ahead

Runners will face a gradual temperature rise from 40°F at the start to 47°F by the finish, with an average humidity of 83%. Headwinds in miles 1, 7-9, and 17 will challenge runners, while a tailwind will provide relief from miles 10-11 and 14-15. With gusts up to 28 mph, pacing adjustments are essential, especially on exposed sections, and hydration should be prioritized due to the humidity.

Race day forecast available in 218 days

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Distance: 26.2mi

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Race Info

The Seattle Marathon offers runners a scenic 42 kilometer journey through the heart of Seattle, showcasing the city's iconic landmarks and natural beauty. Starting near the Space Needle, the course winds through downtown streets, crosses the Ship Canal Bridge, and traverses the University of Washington campus. Participants enjoy picturesque views of Lake Washington, the Olympic Mountains, and the Seattle skyline, all while navigating a course known for its rolling hills and enthusiastic crowd support.

Website

FAQ

When is the 2026 Seattle Marathon?

The 2026 Seattle Marathon will be held on Sunday November 29, 2026.

Is the Seattle Marathon a Boston Marathon Qualifier?

Yes, the Seattle Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 Seattle Marathon?

The forecast calls for a high of 47°F and a low of 40°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 25 years of data

Avg Temp

46°F

L:40° H:47°

RunScore

Conditions

Rain Freq

40%

10 of 25 yrs

Wind8mph

Dew39°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Seattle Marathon Clear conditions throughout the day. 2025	29°/45°	-	32°
2024 Seattle Marathon Partly cloudy throughout the day. 2024	32°/48°	-	36°
2023 Seattle Marathon Clearing in the afternoon. 2023	32°/46°	-	35°
2022 Seattle Marathon Cloudy skies throughout the day with late afternoon rain. 2022	36°/43°	-	36°
2021 Seattle Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2021	55°/58°	Light	50°
2019 Seattle Marathon Partly cloudy throughout the day with afternoon rain. 2019	39°/44°	-	29°
2018 Seattle Marathon Partly cloudy throughout the day with late afternoon rain. 2018	36°/48°	-	36°
2017 Seattle Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2017	48°/55°	Light	49°
2016 Seattle Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2016	42°/46°	Light	42°
2015 Seattle Marathon Cloudy skies throughout the day. 2015	33°/37°	-	32°
2014 Seattle Marathon Clear conditions throughout the day. 2014	26°/37°	-	21°
2013 Seattle Marathon Partly cloudy throughout the day with rain. 2013	54°/55°	-	47°
2012 Seattle Marathon Partly cloudy throughout the day. 2012	37°/46°	-	37°
2011 Seattle Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2011	47°/53°	Light	45°
2010 Seattle Marathon Partly cloudy throughout the day with rain or snow clearing later. 2010	36°/41°	Light	35°
2009 Seattle Marathon Cloudy skies throughout the day. 2009	48°/52°	-	45°
2008 Seattle Marathon Cloudy skies throughout the day with rain clearing later. 2008	52°/54°	Light	51°
2007 Seattle Marathon Clearing in the afternoon. 2007	32°/46°	-	34°
2006 Seattle Marathon Cloudy skies throughout the day with a chance of rain or snow throughout the day. 2006	34°/40°	Light	33°
2005 Seattle Marathon Partly cloudy throughout the day with rain clearing later. 2005	36°/42°	Light	35°
2004 Seattle Marathon Partly cloudy throughout the day. 2004	40°/43°	-	38°
2003 Seattle Marathon Partly cloudy throughout the day. 2003	41°/43°	-	38°
2002 Seattle Marathon Partly cloudy throughout the day. 2002	43°/48°	-	42°
2001 Seattle Marathon Cloudy skies throughout the day with rain. 2001	44°/46°	Light	40°
2000 Seattle Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2000	47°/50°	Light	44°