Race-day weather · Sunday, November 22, 2026

Philadelphia Marathon weather.

25 Philadelphia Marathon race mornings since 2000, measured hour by hour: temperature, dew point, and what the weather cost runners. The forecast for the 2026 race goes live here on Nov 16, six days out.

73 Typical score
at the start The median race morning since 2000: 41°F air + 32°F dew point at 7am, across 25 race mornings at the Philadelphia International weather station. No adjustment needed.
Start · 7am7341° air · 32° dew point
+2 hours · 9am7844° air · 34° dew point
+4 hours · 11am8149° air · 32° dew point

Your goal time on a typical race morning

Built from the median race morning since 2000, averaged across the hours you’d be running. Six days out, the real forecast replaces it.

Goal on a cool dayAdjusted finish
2:45No changescore 76
3:00No changescore 76
3:15No changescore 77
3:30No changescore 77
3:45No changescore 77
4:00No changescore 77
4:30No changescore 78
5:00No changescore 78
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.

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Philadelphia Marathon weather on race morning since 2000

Every row in the table below is a measurement from the Philadelphia International 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 25 race mornings:

  • A typical 7am reading is 41°F with a 32°F dew point, a combined score of 73.
  • The warmest was 2017: 54°F with a 41°F dew point at 7am, a score of 95.
  • The most humid was 2013, with a 47°F dew point.
  • The coldest was 2008, at 26°F.
  • On 0 of 25 race mornings the 7am score was above 100, enough to call for a pace adjustment. Three hours later, 2 of 25 were.
Philadelphia Marathon race mornings · air / dew point (°F) and combined score
YearDateAir / dew at 7amScoreAir / dew at 10amScore
2025Nov 2336° / 29°6545° / 30°75
2024Nov 2448° / 36°8450° / 37°87
2023Nov 1941° / 27°6850° / 30°80
2022Nov 2035° / 12°4734° / 6°40
2021Nov 2140° / 36°7647° / 39°86
2020–Cancelled (COVID-19)
2019Nov 2441° / 38°7943° / 37°80
2018Nov 1834° / 29°6341° / 32°73
2017Nov 1954° / 41°9551° / 32°83
2016Nov 2039° / 23°6243° / 23°66
2015Nov 2252° / 34°8649° / 26°75
2014Nov 2341° / 24°6548° / 23°71
2013Nov 1752° / 47°9960° / 51°111
2012Nov 1839° / 30°6946° / 36°82
2011Nov 2051° / 43°9457° / 45°102
2010Nov 2141° / 26°6746° / 27°73
2009Nov 2242° / 37°7951° / 40°91
2008Nov 2326° / 15°4133° / 15°48
2007Nov 1842° / 33°7545° / 34°78
2006Nov 1941° / 32°7345° / 32°77
2005Nov 2035° / 30°6546° / 32°78
2004Nov 2149° / 47°9650° / 48°98
2003Nov 2343° / 43°8648° / 48°96
2002Nov 2436° / 29°6545° / 31°76
2001Nov 1839° / 37°7647° / 41°88
2000Nov 1934° / 24°5837° / 24°61

Readings from the Philadelphia International ASOS weather station (NOAA/FAA, via the Iowa Environmental Mesonet), the observation nearest each hour. Scores above 100 call for a pace adjustment. 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.

Want the next one built around you?

A forecast adjusts a pace. It doesn't know your training, how you handle heat, or how your last long run went. I write every plan by hand and set race-week pacing with each athlete. It starts with a free 20-minute call.

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Other race-day weather pages

NYC MarathonSunday, November 1, 202683Typical startNo adjustment needed Chicago MarathonSunday, October 11, 2026113Race day at the startSlight penalty: 0.5% to 1% slower Boston MarathonMonday, April 19, 202784Typical startNo adjustment needed California International MarathonSunday, December 6, 202683Typical startNo adjustment needed

All race-day weather pages

RunFitCoach is not affiliated with the Philadelphia Marathon or its organizers. Observations from the Philadelphia International ASOS station (NOAA/FAA) via the Iowa Environmental Mesonet. Data updated Tuesday, October 13, 2026.

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