Race-day weather · Wyndo for runners
Portland Marathon weather
October 4, 2026 · Portland, OR · 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.
This edition has run
The 2026 Portland Marathon is behind us
The next edition typically follows the race's pattern — 1st Sunday of October. We'll flip this page to the new date (and the live start-time read for race week) when the race confirms its schedule. The history below keeps the long view.
Race-morning weather history
Early-October Portland typically upper 40s-50s F with real rain risk, though recent editions (incl. 2025) were dry and sunny. 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
49°F
p75 (a warm year): 52°F
Median dew point
47°F
at the start hour
Rain at the start
10%
2 of 20 measured years
Warmest start
57°F
in 2010
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2025 | 51°F | 49°F | 4 mph | dry | 72°F |
| 2024 | 44°F | 41°F | 3 mph | dry | 74°F |
| 2023 | 44°F | 40°F | 1 mph | dry | 70°F |
| 2022 | 54°F | 51°F | 2 mph | dry | 88°F |
| 2021 | 49°F | 46°F | 1 mph | dry | 67°F |
| 2020 | 56°F | 53°F | 4 mph | dry | 67°F |
| 2019 | 43°F | 41°F | 3 mph | dry | 70°F |
| 2018 | 46°F | 43°F | 1 mph | dry | 56°F |
| 2017 | 50°F | 48°F | 4 mph | dry | 65°F |
| 2016 | 51°F | 49°F | 1 mph | 1.1 mm | 60°F |
| 2015 | 48°F | 45°F | 3 mph | dry | 81°F |
| 2014 | 52°F | 49°F | 3 mph | dry | 85°F |
| 2013 | 42°F | 39°F | 2 mph | dry | 75°F |
| 2012 | 44°F | 26°F | 4 mph | dry | 80°F |
| 2011 | 54°F | 52°F | 3 mph | 0.4 mm | 66°F |
| 2010 | 57°F | 52°F | 2 mph | dry | 64°F |
| 2009 | 46°F | 44°F | 5 mph | dry | 66°F |
| 2008 | 52°F | 49°F | 4 mph | dry | 58°F |
| 2007 | 56°F | 49°F | 7 mph | dry | 65°F |
| 2006 | 49°F | 46°F | 3 mph | dry | 68°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
- SW Salmon St at Naito Pkwy, Waterfront Park
- Scheduled start
- 7:00 AM (America/Los_Angeles) — Half starts 7:00, marathon and 10K start 7:15; mass starts (no waves/corrals), per official info page.
- Field size
- 2025 marathon finishers ~3,000; ~12,000 across all distances
- Registration
- open
Wyndo is not affiliated with or endorsed by the Portland Marathon (officially the "Portland 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.