Chicago 13.1
Race Day Weather
Mild temps, strategic wind shifts
Runners will face a temperature range from 61°F to 63°F, with humidity at 78%. Light winds will start as a tailwind in Miles 1, 3, and 10-14, but transition to headwinds from Miles 5-9, requiring pacing adjustments. Given the mild conditions, runners should maintain hydration and adjust their pace during the headwind segments to conserve energy.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Chicago 13.1
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Chicago 13.1 race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The Chicago 13.1 starts and finishes in Garfield Park, looping through Humboldt Park and Douglass Park on Chicago's West Side. It's the half marathon leg of the Chicago Distance Series, run alongside the Chicago Marathon and Shamrock Shuffle. The course is flat, staying on West Side boulevards and parkways away from the lakefront route used by most Chicago races.
