Chicago Marathon Forecast Cools Down for Sunday — image accompanying Marathon Handbook's report. Image accompanying Marathon Handbook’s report; reduced and presented for news commentary with the attributed report. View the complete source report.
The Chicago Marathon's weather outlook has shifted to cooler temperatures. Marathon Handbook reported the forecast at 60 F for 7 a.m. Sunday. Dew point and humidity will make conditions feel heavier.
Saturday's highs are between 75 F and 80 F, with overnight temperatures dropping to the low 60s. The race morning temperature will rise slowly to 66 F by 10 a.m. Winds from the southeast will add to the conditions. Read more culture coverage.
The race's Event Alert System is set at yellow, advising runners to slow down. The system can change before the start. The cooler forecast contrasts with typical Chicago race mornings at about 53 F. Related: Chicago Marathon Faces Less-Than-Ideal Conditions.
This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.
Reader questions
Questions about this report
What should runners know about Chicago Marathon Forecast Cools Down for Sunday?
Race morning expected to start at 60 F with humidity affecting comfort. The Chicago Marathon's weather outlook has shifted to cooler temperatures. Marathon Handbook reported the forecast at 60 F for 7 a.m. Sunday. Dew point and humidity will make conditions feel heavier.
When did Runner World publish this culture brief?
Runner World published this brief on October 11, 2026. The underlying Marathon Handbook report was dated October 10, 2026.
Where can readers find the complete original report?
This summary is based on reporting from Marathon Handbook. The attributed source link in the article leads to the publisher’s complete report.
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