Race-day weather · Sunday, March 7, 2027

Atlanta Marathon weather.

20 Atlanta Marathon race mornings since 2007, 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 Mar 1, six days out.

97 Typical score
at the start The median race morning since 2007: 52°F air + 45°F dew point at 7:15am, across 20 race mornings at the Atlanta Hartsfield-Jackson International weather station. No adjustment needed.
Start · 7:15am9752° air · 45° dew point
+2 hours · 9:15am10052° air · 48° dew point
+4 hours · 11:15am10255° air · 47° dew point

Your goal pace on a typical race morning

Built from the median race morning since 2007, 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 98
3:006:52/miNo changescore 98
3:157:26/miNo changescore 98
3:308:01/miNo changescore 98
3:458:35/miNo changescore 98
4:009:09/miNo changescore 99
4:3010:18/miNo changescore 99
5:0011:27/miNo changescore 99
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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Atlanta Marathon weather history: every race morning since 2007

Every row in the table below is a measurement from the Atlanta Hartsfield-Jackson International weather station, taken nearest 7:15am (today’s first-wave start) and again three hours later. Start times have moved over the years, so treat 7:15am as a clock time, not always the gun. Across 20 race mornings:

  • A typical 7:15am reading is 52°F with a 45°F dew point, a combined score of 97.
  • The warmest was 2023: 62°F with a 59°F dew point at 7:15am, a score of 121.
  • The most humid was 2023, with a 59°F dew point.
  • The coldest was 2024, at 35°F.
  • On 9 of 20 race mornings the 7:15am score was above 100, enough to call for a pace adjustment. Three hours later, 10 of 20 were.
  • The windiest start was 2008: E wind at 21 mph.
  • Rain fell in the first 5 hours on 4 of 20 race mornings. The most rain measured was 0.37 inches, in 2022.
Atlanta Marathon weather by year · air / dew point (°F), combined score, wind and rain
YearDateAir / dew at 7:15amScoreAir / dew at 10:15amScoreWind at 7:15amRain
2026Mar 149° / 43°9264° / 46°110WNW 6 mphDry
2025Mar 236° / 20°5639° / 20°59N 10 mphDry
2024Feb 2535° / 25°6047° / 26°73WNW 7 mphDry
2023Feb 2662° / 59°12168° / 59°127WNW 5 mphDry
2022Feb 2750° / 46°9649° / 47°96NE 9 mph0.37 in
2021Feb 28Moved to Atlanta Motor Speedway (COVID-19)57° / 55°11266° / 60°126SSE 3 mphDry
2020Mar 136° / 25°6150° / 23°73CalmDry
2019Mar 1743° / 23°6647° / 23°70N 10 mphgusts 18Dry
2018Mar 1859° / 56°11561° / 50°111WNW 6 mphDry
2017Mar 1943° / 32°7546° / 33°79NW 7 mphDry
2016Mar 2044° / 34°7848° / 34°82NW 13 mphDry
2015Mar 2256° / 50°10655° / 50°105NNE 6 mph0.13 in
2014Mar 2356° / 48°10452° / 43°95SW 6 mphLight rain
2013Mar 1755° / 47°10258° / 50°108SW 5 mphDry
2012Mar 1861° / 53°11470° / 53°123W 3 mphDry
2011Mar 2060° / 55°11560° / 51°111E 12 mphDry
2010Mar 2154° / 43°9752° / 49°101SE 6 mph0.02 in
2009Mar 2944° / 36°8046° / 37°84WSW 8 mphDry
2008Mar 3044° / 42°8643° / 41°84E 21 mphDry
2007Mar 2561° / 49°11072° / 52°124WNW 7 mphDry

Readings from the Atlanta Hartsfield-Jackson International 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 7:15am. 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 Jersey City MarathonSunday, April 18, 202791Typical startNo adjustment needed Boston MarathonMonday, April 19, 202784Typical startNo adjustment needed Rock 'n' Roll Nashville MarathonSaturday, April 24, 2027111Typical startSlight penalty: 0.5% to 1% slower Eugene MarathonSunday, April 25, 202789Typical startNo adjustment needed Big Sur MarathonSunday, April 25, 202796Typical 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 OC MarathonSunday, May 2, 2027110Typical startBarely a penalty: 0% to 0.5% slower Colfax MarathonSunday, May 16, 202781Typical 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, Jersey City Marathon, Boston Marathon, Rock 'n' Roll Nashville Marathon, Eugene Marathon, Big Sur Marathon, Flying Pig Marathon, Pittsburgh Marathon, OC Marathon, Colfax Marathon, Rock 'n' Roll San Diego Marathon, Grandma's Marathon, San Francisco Marathon. All race-day weather pages.

RunFitCoach is not affiliated with the Publix Atlanta Marathon or its organizers. Observations from the Atlanta Hartsfield-Jackson International 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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