Race-day weather · Wyndo for runners
Seattle Marathon weather
November 29, 2026 · Seattle, WA · scheduled start 7:00 AM (America/Los_Angeles). What the start usually feels like, year by year — and a live start-time read once the race is inside the 7-day forecast window.
Countdown
130 days to race day
The live race-day forecast unlocks 124 days from now, when November 29, 2026 enters the 7-day forecast window — a start-time read for the scheduled 7:00 AM start. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
Typical start temp
40°F
median of 20 years
A warm year
49°F
75th percentile start temp
Rain at the start
30%
6 of 20 measured years
Race-morning weather history
Cool rain is the norm for late-November Seattle — plan for 40s F and wet. Wyndo tracks what this calendar slot has actually served up at the start hour — temperature, dew point, wind, and rain — including the years when weather canceled or disrupted the race, and reads the live forecast for the start once race week arrives.
Median start temp
40°F
p75 (a warm year): 49°F
Median dew point
38°F
at the start hour
Rain at the start
30%
6 of 20 measured years
Warmest start
57°F
in 2021
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2025 | 36°F | 33°F | 3 mph | dry | 46°F |
| 2024 | 37°F | 35°F | 3 mph | dry | 48°F |
| 2023 | 33°F | 31°F | 5 mph | dry | 47°F |
| 2022 | 41°F | 37°F | 3 mph | 0.2 mm | 47°F |
| 2021 | 57°F | 52°F | 13 mph | dry | 58°F |
| 2020 | 39°F | 38°F | 4 mph | dry | 48°F |
| 2019 | 38°F | 30°F | 5 mph | 0.2 mm | 43°F |
| 2018 | 40°F | 37°F | 2 mph | dry | 49°F |
| 2017 | 53°F | 47°F | 7 mph | 0.5 mm | 53°F |
| 2016 | 44°F | 43°F | 5 mph | dry | 47°F |
| 2015 | 32°F | 30°F | 3 mph | dry | 38°F |
| 2014 | 24°F | 21°F | 5 mph | dry | 36°F |
| 2013 | 52°F | 50°F | 16 mph | 1.3 mm | 52°F |
| 2012 | 42°F | 38°F | 2 mph | dry | 46°F |
| 2011 | 53°F | 39°F | 14 mph | dry | 54°F |
| 2010 | 40°F | 40°F | 3 mph | 0.2 mm | 41°F |
| 2009 | 49°F | 47°F | 9 mph | dry | 52°F |
| 2008 | 53°F | 53°F | 2 mph | dry | 55°F |
| 2007 | 39°F | 38°F | 3 mph | dry | 44°F |
| 2006 | 38°F | 31°F | 10 mph | 1.0 mm | 41°F |
Slot climatology: each row is the weather at this race's usual calendar slot and start hour (ERA5 reanalysis at the start line) — including years when the edition was canceled or moved. A computed slot date is not a claim the race ran that day.
Your heat-adjusted goal for the marathon
The same cited model as the full calculator, pointed at this race: the median start-hour conditions this calendar slot has served up — climatology, not a forecast.
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Race facts
- Start line
- Seattle Center, 5th Ave N & Harrison St
- Scheduled start
- 7:00 AM (America/Los_Angeles) — Half starts 7:00, full marathon 7:30, per official 2026 page; start at Seattle Center (5th & Harrison), finish at Bell Harbor Pier 66 — a changed start/finish from prior Memorial Stadium editions.
- Field size
- 2025 marathon finishers ~1,500; half ~4,200
- Registration
- open
Wyndo is not affiliated with or endorsed by the Seattle Marathon (officially the "UW Medicine Seattle Marathon and Half Marathon") or its organizers. Race names are used descriptively to identify the event; schedules and start times belong to the race — always confirm details on the official site. Weather guidance here is informational, never medical advice, and event alert flags on race day belong to the race's own medical team.