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Boston Cut-off Time Prediction Contest

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Historical weather

Historical Race Day Weather for the Illinois Marathon

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

Weather Averages for Last 10 Years

Race day snapshot

Overcast

Most common race morning weather across the last 10 years.

Start Line Conditions

Start Temp 49°F 9°C

Start Humidity 81% Humidity

Wind E 12 mph

Race day high 63°F 17°C

Race day low 47°F 8°C

PR Score 98.62 Weather-influenced race day scoring

Course Score 99.08 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.

April 25, 2026

Race day snapshot

Overcast

Start Line Conditions

Start Temp 51°F 11°C

Start Humidity 97% Humidity

Wind NNE 14 mph Wind

Race day high 71°F 22°C

Race day low 50°F 10°C

PR Score 98.91 Normal score 99.12