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Historical weather

Historical Race Day Weather for the Charles River Marathon

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

Weather Averages for Last 8 Years

Race day snapshot

Partially cloudy

Most common race morning weather across the last 8 years.

Start Line Conditions

Start Temp 61°F 16°C

Start Humidity 79% Humidity

Wind W 9 mph

Race day high 70°F 21°C

Race day low 57°F 14°C

PR Score 96.91 Weather-influenced race day scoring

Course Score 99.55 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.

May 3, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 45°F 7°C

Start Humidity 73% Humidity

Wind NNW 10 mph Wind

Race day high 58°F 14°C

Race day low 44°F 7°C

PR Score 99.55 Normal score 99.55