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Boston Cut-off Time Prediction Contest

Predict the 2027 Boston Cut-off Time and win a great prize and bragging rights among all your running friends.

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Historical weather

Historical Race Day Weather for the Clarence DeMar Marathon

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

Weather Averages for Last 16 Years

Race day snapshot

Clear

Most common race morning weather across the last 16 years.

Start Line Conditions

Start Temp 51°F 11°C

Start Humidity 88% Humidity

Wind N 2 mph

Race day high 70°F 21°C

Race day low 47°F 8°C

PR Score 98.32 Weather-influenced race day scoring

Course Score 99.5 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.

September 27, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 55°F 13°C

Start Humidity 90% Humidity

Wind NNE 3 mph Wind

Race day high 64°F 18°C

Race day low 51°F 11°C

PR Score 0.00 Normal score 99.05

Course Score 0.00 Course-only Score

Boston Qualifying Cut-off Time Prediction Contest