More than 55,000 participants are expected at the Chicago Marathon on Sunday, Oct. 11, which would make it the race’s largest field. Organizers have set a yellow alert as a warmer-than-average day approaches.
The National Weather Service forecast issued Saturday afternoon called for sunshine, light winds and a downtown high near 71 degrees Fahrenheit. The average high for the date is 65 degrees Fahrenheit, according to the race’s historical weather guide. Earlier forecasts had put the high near 77 degrees Fahrenheit.
Wheelchair and handcycle athletes are scheduled to start shortly after 7:20 a.m., with runner waves at 7:35, 8 and 8:35 a.m. Those taking five or six hours to finish could remain on the course into the warmer early afternoon. The yellow alert is the race’s moderate warning level, and organizers have asked runners to adjust their pace as conditions change.






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