Chicago Marathon

Chicago, IL, USA · October 11, 2026

55°·66° high·Breezy·Dry

Weather

Race Day Weather

55°at start

66° high

Breezy

Dry

Cool start, variable winds ahead

Runners will face a temperature increase from 55°F at the start to 66°F by the finish, with humidity at 60%. Wind will shift from a tailwind to headwinds through various segments, peaking at 12 mph. Runners should prepare for tough stretches with headwinds from miles 2-14 and mile 21, while taking advantage of tailwinds from miles 1-2 and 24-27 for faster pacing.

Race day forecast available in 162 days

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Distance: 26.2mi

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Race Info

The Chicago Marathon is a marathon (long-distance foot race) held every October in Chicago, Illinois. It is one of the six World Marathon Majors. Thus, it is also a World Athletics Label Road Race. The Chicago Marathon is the fourth-largest race by number of finishers worldwide. Wikipedia

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FAQ

When is the 2026 Chicago Marathon?

The 2026 Chicago Marathon will be held on Sunday October 11, 2026.

Is the Chicago Marathon a Boston Marathon Qualifier?

Yes, the Chicago Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 Chicago Marathon?

The forecast calls for a high of 66°F and a low of 54°F with a 0% chance of rain.

Historical Weather

Based on 26 years of data

Avg Temp

64°F

L:51° H:64°

RunScore

Conditions

Rain Freq

12%

3 of 26 yrs

Wind11mph

Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Chicago Marathon Partly cloudy throughout the day. 2025	52°/67°	-	47°
2024 Chicago Marathon Partly cloudy throughout the day. 2024	59°/66°	-	49°
2023 Chicago Marathon Partly cloudy throughout the day. 2023	47°/55°	-	36°
2022 Chicago Marathon Becoming cloudy in the afternoon. 2022	46°/68°	-	35°
2021 Chicago Marathon Partly cloudy throughout the day with afternoon rain. 2021	72°/75°	Light	62°
2020 Chicago Marathon Partly cloudy throughout the day. 2020	60°/67°	-	53°
2019 Chicago Marathon Partly cloudy throughout the day. 2019	42°/54°	-	32°
2018 Chicago Marathon Cloudy skies throughout the day with rain. 2018	58°/60°	Light	56°
2017 Chicago Marathon Partly cloudy throughout the day. 2017	57°/77°	-	53°
2016 Chicago Marathon Partly cloudy throughout the day. 2016	52°/63°	-	44°
2015 Chicago Marathon Partly cloudy throughout the day. 2015	54°/77°	-	48°
2014 Chicago Marathon Becoming cloudy in the afternoon with late afternoon rain. 2014	44°/62°	-	39°
2013 Chicago Marathon Clear conditions throughout the day with early morning rain. 2013	48°/63°	-	38°
2012 Chicago Marathon Partly cloudy throughout the day. 2012	40°/49°	-	25°
2011 Chicago Marathon Clear conditions throughout the day. 2011	59°/79°	-	50°
2010 Chicago Marathon Partly cloudy throughout the day. 2010	60°/83°	-	49°
2009 Chicago Marathon Partly cloudy throughout the day. 2009	32°/43°	-	20°
2008 Chicago Marathon Partly cloudy throughout the day. 2008	62°/83°	-	56°
2007 Chicago Marathon Partly cloudy throughout the day. 2007	71°/86°	-	67°
2006 Chicago Marathon Cloudy skies throughout the day with rain clearing later. 2006	38°/40°	Light	33°
2005 Chicago Marathon Clearing in the afternoon. 2005	51°/58°	-	43°
2004 Chicago Marathon Partly cloudy throughout the day. 2004	50°/61°	-	43°
2003 Chicago Marathon Clear conditions throughout the day with early morning rain. 2003	48°/68°	-	42°
2002 Chicago Marathon Clear conditions throughout the day. 2002	39°/48°	-	23°
2001 Chicago Marathon Partly cloudy throughout the day. 2001	35°/52°	-	25°
2000 Chicago Marathon Becoming cloudy in the afternoon. 2000	54°/68°	-	51°

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