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Best Boston Marathon Qualifiers for 2026

Best Boston Marathon Qualifiers

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Marathon Pace Bands

Marathon Pace Bands

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Historical weather

Historical Race Day Weather for the Chicago Marathon

See historical race day weather for the Chicago Marathon, including start temperature, humidity, wind, race day temperatures, PR score, and course score.

Race Day Forecast Tool

See Your 2026 Chicago Marathon Race Day Conditions

Plug in your goal time and start wave to see what conditions you’ll face throughout the race — including temperature changes, headwinds, and tailwinds along the course.

View 2026 Chicago Marathon Weather Tracker
Built to help runners plan pace and gear around real race day weather.

Weather Averages for Last 23 Years

Race day snapshot
Mostly Cloudy
Mostly Cloudy
Most common race morning weather across the last 23 years.
Start Line Conditions
Start Temp 52°F 11°C
Start Humidity 77% Humidity
Wind N 7 mph
Race day high 67°F 19°C
Race day low 50°F 10°C
PR Score 98.7 Weather-influenced race day scoring
Course Score 99.76 Course-only Score

Race Day Weather by Year

Most recent years appear first so you can quickly compare start conditions, temperatures, wind, and scores across different editions of the race.

October 11, 2026

Race day snapshot
Partially cloudy
Partially cloudy
Start Line Conditions
Start Temp 59°F 15°C
Start Humidity 80% Humidity
Wind N 1 mph Wind
Race day high 70°F 21°C
Race day low 58°F 14°C
PR Score 97.73 Normal score 99.76
Course Score 99.76 Course-only Score
Marathon Pace BandsLive Pace Band phone preview

Course-adjusted pacing

Want to run your best Chicago Marathon?

Chicago Marathon Pace Bands are adjusted for the specific terrain of the course, your goal time, and pacing strategy.

Build your Chicago Marathon pace band

Easy to useCourse-aware pacing, goal-time based splits, and a cleaner race day plan.See all pace bands