Race-day weather · Sunday, April 25, 2027

Eugene Marathon weather.

18 Eugene Marathon race mornings since 2000, measured hour by hour: temperature, dew point, wind, rain, and what the weather cost runners. The forecast for the 2027 race goes live here on Apr 19, six days out.

89 Typical score
at the start The median race morning since 2000: 46°F air + 43°F dew point at 7am, across 18 race mornings at the Eugene Airport (Mahlon Sweet Field) weather station. No adjustment needed.
Start · 7am8946° air · 43° dew point
+2 hours · 9am9650° air · 46° dew point
+4 hours · 11am10055° air · 45° dew point

The Eugene Marathon course, mile by mile: the elevation, every climb, and how I’d run each stretch.

Your goal pace on a typical race morning

Built from the median race morning since 2000, averaged across the hours you’d be running. Where the weather costs time, each cell gives the adjusted finish time and the pace per mile to run instead. Six days out, the real forecast replaces it.

Goal on a cool dayAdjusted finish
2:456:18/miNo changescore 94
3:006:52/miNo changescore 94
3:157:26/miNo changescore 95
3:308:01/miNo changescore 95
3:458:35/miNo changescore 95
4:009:09/miNo changescore 95
4:3010:18/miNo changescore 96
5:0011:27/miNo changescore 96
How I’d race a typical year

Race the plan as written. This is the weather marathons are built for, and the only real risk is going out too fast because the first miles feel free. Hold goal pace through halfway and let the second half decide itself.

Race week, start to finish: how I’d run the three-week taper, what to take in during the race, how much to slow down in heat and humidity, and what the four weeks after should look like.

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Eugene Marathon weather history: every race morning since 2000

Every row in the table below is a measurement from the Eugene Airport (Mahlon Sweet Field) weather station, taken nearest 7am (today’s first-wave start) and again three hours later. Start times have moved over the years, so treat 7am as a clock time, not always the gun. Across 18 race mornings:

  • A typical 7am reading is 46°F with a 43°F dew point, a combined score of 89.
  • The warmest was 2014: 59°F with a 55°F dew point at 7am, a score of 114.
  • The most humid was 2014, with a 55°F dew point.
  • The coldest was 2019, at 35°F.
  • On 2 of 18 race mornings the 7am score was above 100, enough to call for a pace adjustment. Three hours later, 6 of 18 were.
  • The windiest start was 2019: N wind at 7 mph.
  • Rain fell in the first 5 hours on 2 of 18 race mornings (1 more saw only a trace).
Eugene Marathon weather by year · air / dew point (°F), combined score, wind and rain
YearDateAir / dew at 7amScoreAir / dew at 10amScoreWind at 7amRain
2026Apr 2636° / 33°6955° / 41°96SSE 6 mphDry
2025Apr 2746° / 42°8850° / 38°88CalmDry
2024Apr 2849° / 45°9451° / 44°95S 5 mphDry
2023Apr 3053° / 49°10257° / 48°105WSW 5 mphTrace
2022May 142° / 41°8350° / 44°94CalmDry
2021–Virtual only (COVID-19), no race morning
2020–Cancelled (COVID-19)
2019Apr 2835° / 32°6748° / 37°85N 7 mphDry
2018Apr 2946° / 46°9253° / 47°100S 5 mphLight rain
2017May 743° / 41°8452° / 42°94CalmDry
2016May 144° / 42°8658° / 48°106ESE 3 mphDry
2015May 1051° / 46°9757° / 46°103S 7 mphDry
2014Jul 2759° / 55°11470° / 54°124N 3 mphDry
2013Apr 2849° / 45°9455° / 47°102S 5 mphDry
2012Apr 2949° / 47°9653° / 48°101CalmDry
2011May 136° / 34°7047° / 38°85–Dry
2010May 247° / 43°9052° / 39°91CalmDry
2009May 348° / 47°9552° / 47°99Calm0.04 in
2008May 440° / 37°7749° / 42°91NNE 6 mphDry
2007Apr 2944° / 42°8653° / 46°99CalmDry

Readings from the Eugene Airport (Mahlon Sweet Field) ASOS weather station (NOAA/FAA, via the Iowa Environmental Mesonet), the observation nearest each hour. Scores above 100 call for a pace adjustment. Rain is the total the station measured in the 5 hours after 7am. Download every hour as a CSV.

How the score works

Add the air temperature to the dew point, both in Fahrenheit. That combined score is closer to what your body feels than the temperature alone, because dew point decides whether your sweat can evaporate, and evaporating sweat is how you shed heat at race pace. The bands below are the same ones my heat pace calculator uses, and that page has the full chart and the physiology behind it.

Combined score → how much to slow down
  • 100 or lessNo pace adjustment
  • 101 – 1100% to 0.5% slower
  • 111 – 1200.5% to 1% slower
  • 121 – 1301% to 2% slower
  • 131 – 1402% to 3% slower
  • 141 – 1503% to 4.5% slower
  • 151 – 1604.5% to 6% slower
  • 161 – 1706% to 8% slower
  • 171 – 1808% to 10% slower
  • Above 180Hard running is not recommended

The bands are a coach's rule of thumb, not a lab measurement. Treat each range as a starting point and let effort make the final call.

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Other race-day weather pages

Twin Cities MarathonSunday, October 4, 202695Race day at the startNo adjustment needed Chicago MarathonSunday, October 11, 2026113Race day at the startSlight penalty: 0.5% to 1% slower Columbus MarathonSunday, October 18, 202664Forecast at the startNo adjustment needed Detroit MarathonSunday, October 18, 202672Forecast at the startNo adjustment needed Marine Corps MarathonSunday, October 25, 202694Typical startNo adjustment needed NYC MarathonSunday, November 1, 202683Typical startNo adjustment needed Philadelphia MarathonSunday, November 22, 202673Typical startNo adjustment needed California International MarathonSunday, December 6, 202683Typical startNo adjustment needed Honolulu MarathonSunday, December 13, 2026136Typical startReal penalty: 2% to 3% slower Houston MarathonSunday, January 17, 202784Typical startNo adjustment needed LA MarathonSunday, March 7, 202799Typical startNo adjustment needed Boston MarathonMonday, April 19, 202784Typical startNo adjustment needed Flying Pig MarathonSunday, May 2, 2027102Typical startBarely a penalty: 0% to 0.5% slower Pittsburgh MarathonSunday, May 2, 202799Typical startNo adjustment needed Rock 'n' Roll San Diego MarathonSunday, June 6, 2027119Typical startSlight penalty: 0.5% to 1% slower Grandma's MarathonSaturday, June 19, 2027112Typical startSlight penalty: 0.5% to 1% slower San Francisco MarathonSunday, July 25, 2027109Typical startBarely a penalty: 0% to 0.5% slower

Course guides, mile by mile: Twin Cities Marathon, Chicago Marathon, Columbus Marathon, Detroit Marathon, Marine Corps Marathon, NYC Marathon, Philadelphia Marathon, California International Marathon, Honolulu Marathon, Houston Marathon, LA Marathon, Boston Marathon, Flying Pig Marathon, Pittsburgh Marathon, Rock 'n' Roll San Diego Marathon, Grandma's Marathon, San Francisco Marathon. All race-day weather pages.

RunFitCoach is not affiliated with the Eugene Marathon or its organizers. Observations from the Eugene Airport (Mahlon Sweet Field) ASOS station (NOAA/FAA) via the Iowa Environmental Mesonet. Data updated Saturday, October 17, 2026.

Heat is one variable. I plan for all of them.

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