Runners will face a temperature rise from 55°F to 66°F, with a steady headwind peaking at 12 mph. Humidity will remain moderate at 60%, ensuring comfortable conditions, but the varying wind across segments will challenge pacing. Expect headwinds from miles 2-14, with runners advised to conserve energy during these stretches and utilize the tailwind from miles 24-27 for a strong finish.
Race day forecast available in 198 days
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Pace Calculator
Distance: 26.2mi
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Pace
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Common Goals:
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
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.
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.
