Seattle Marathon ·
What will race morning in Seattle cost you?
Past starts: 5°C typical, 1 to 10°C since 2021.Live forecast opens 14 November.
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Works with Apple Health01 · The conditions
Race-day weather
Race-day forecasts appear 15 days before the race. Until then, here is what race morning has looked like.
Explore historical weatherGet Seattle race-morning weather on your phone when it opens.
Set up Seattle in the app now: your goal, your start, your pace plan. The race-morning forecast lands in it in race week.
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02 · Same effort, different day
What the weather may cost your goal
3:15:00 goal. On a typical race morning here, expect about 3:15 to 3:19. Main factor: cold.
- Heat and sun+1%
- Wind and comfort0%
- Weather total+1%
RunWeather’s pace model, one weather hour at your goal effort: weather at 07:00 local using the five-year race-morning average. A planning preview, not a predicted finish. Hills, turns, shelter, fuelling, heat adaptation and wave timing are not modelled here; rain is left out because a probability is not a measured rain rate. Explore the heat pace calculator.
View even-pace checkpoints
| Distance | Elapsed time |
|---|---|
| 5.0 km | 0:23:06 |
| 10.0 km | 0:46:13 |
| 15.0 km | 1:09:19 |
| 20.0 km | 1:32:26 |
| 25.0 km | 1:55:32 |
| 30.0 km | 2:18:39 |
| 35.0 km | 2:41:45 |
| 40.0 km | 3:04:51 |
| 42.2 km · Finish | 3:15:00 |
In the app
Your race plan, on race morning
Add the Seattle Marathon and the app keeps your plan current until the gun.
Goal pace against race-day pace
What your goal is worth on this morning’s weather, per km and at the finish.
How to spend it
Start, middle and finish, against your average.
What slows you
Heat, wind and hills, each in minutes.
Reference
Everything else about race morning
Open any row for the full detail.
The course42.2 km · 4 to 52 m
The Seattle Marathon is a marathon in Seattle, United States. The map is the 2025 course. Check the organiser's map for this year.
THE COURSE42.2 km1×Zoom to drag the route. Keyboard: + / −, arrows, Home to reset.
2025 course. Check the organiser’s map for this year.
ELEVATION4–52 m0.0 km- Elevation
- 28 m
Hover or drag to explore. Use ← → when focused.
The 2025 course from RunWeather's race catalogue. The next edition may differ; elevation is approximate. Elevation along that course, not confirmed for this year. Official race site ↗01The first start is listed at 07:00 local time. Check the forecast for your own wave or corral start.
02Compare the conditions at your start and expected finish before settling on kit and effort.
03Confirm late changes to the route, start wave and logistics with the organiser.
Race-window historyLast 5 years, race date ±5 days
A range for planning Seattle Marathon: weather near Seattle on race morning, the last 5 years (2021 to 2025, race date ±5 days). Not a forecast.
Typical start-hour air5°C10th–90th percentile 1°C–10°CDew point / humidity4°C90% relative humidityStart-hour wind8 km/hDirection varies by dayHours with rain36%Historical frequency at this hourAIR THROUGH THE RUN5°C → 6°C by +4hThe five-year picture
07:00- Air temperature
- 5°C
- Humidity
- 90%
- Wind
- 8 km/h
- Hours with rain
- 36%
Hover or drag to explore. Use ← → when focused. Shading: middle 80% of sampled temperatures.
Five-year average Middle 80% of sampled hoursThe sampled air changes little over four hours; still check your own finish-hour forecast.
WIND CONTEXTWhere the breeze came from
WIND FROME15 of 55 samples · 27%
Mean 7 km/hThe petals show how often the wind came from each direction at the sampled start hour. They do not predict the direction on race day.
A city-point wind rose cannot tell you which parts of the course will be sheltered or exposed. Use the live forecast and the organiser’s route map together.
Method: 55 ERA5 hourly samples at 07:00 local time, across 11 calendar days per year in 2021–2025. The sample uses the hour containing the advertised first start; waves may start later. Grid weather is modelled reanalysis, not an on-course station reading. Open-Meteo Historical Weather API . Data generated 2026-10-14.
November climateAll-hours monthly averages
November averages in Seattle, from 2022 to 2024. These are monthly conditions, not a race-day forecast.
- mean temperature
- 7°C
- mean humidity
- 83%
- mean wind
- 11 km/h
- hours with rain
- 26%
Monthly, all-hours averages for Seattle, 2022–2024. Not past race-day measurements or a forecast. Rain is the share of historical hours with precipitation, not the chance of rain on race day. Source: Open-Meteo ERA5.
Explore running weather in SeattleSeattle Marathon FAQs7 questions
When is the 2026 Seattle Marathon?
Seattle Marathon is listed for 29 November 2026. Confirm the latest details on the official event website before travelling.
Is the weather shown a forecast for the Seattle Marathon?
Only from about 15 days before the race, when the page shows the live race-day forecast. Before that, you see the weather near the city on the mornings around race day in the last 5 years: what is typical, not what will happen. Monthly averages, when shown, cover every hour of the race month.
What is race morning usually like at the Seattle Marathon?
Around the 07:00 start, mornings around race day near Seattle in the last 5 years averaged 5°C, 90% humidity and 8 km/h wind. Most started between 1 and 10°C. This is weather near the city, not a reading from the race itself or a forecast.
Which recent year had the warmest race morning at the Seattle Marathon?
2021. Around race day that year it was about 9°C around the 07:00 start, against 5°C on an average year.
Which recent year had the windiest race morning at the Seattle Marathon?
2021, with about 12 km/h of wind around the 07:00 start. Over the last 5 years the wind here came mostly from the east.
How should I pace the Seattle Marathon on a warm day?
3:15:00 goal. On a typical race morning here, expect about 3:15 to 3:19. Main factor: cold. If race day comes in warmer, start a little easier than goal pace, run by feel to halfway and drink early. Plan my race gives your splits for the day.
Can past years predict the weather on race day at the Seattle Marathon?
No. They show what race morning is usually like, not what this year will bring. Check the live forecast in the last 15 days, look at the hours through your expected finish, and follow the organiser for start and course updates.
Sources and race informationOrganiser, weather data, guide reviewed 2026-10-13
Past race-morning weather: Open-Meteo Historical Weather API, weather near the city from 2021 to 2025, updated 2026-10-14. Not official race-day readings.
Guide reviewed . RunWeather is an independent guide, not the race organiser. Dates, waves and routes can change; the organiser’s latest instructions take priority. Course map: The 2025 course from RunWeather's race catalogue. The next edition may differ; elevation is approximate.
Seattle race morning, on your phone.
Free on iPhone and Android. Your race plan, updated with the forecast until the gun.
On a computer? Scan with your phone camera to get the app.