Race Day Weather
Cool start, steady conditions
Runners will face temperatures starting at 50°F and rising to 59°F. Winds will be from the SSE at 11 mph, with gusts up to 25 mph, providing a slight headwind. With humidity at 66% and dew point at 43°F, runners are advised to maintain a steady pace and stay hydrated throughout the race.
Pace Calculator
The Charles River Marathon offers a flat, fast, and USATF-certified 42.2-kilometer course along Boston's scenic Charles River, starting and finishing at Herter Park. Runners complete ten laps on a 2.6-mile loop, with over 49% of finishers qualifying for the Boston Marathon in recent years. This event combines competitive racing with a supportive atmosphere, featuring live DJ music and a focus on fundraising for cancer research. Source
Historical Weather
Temperature History
Range of temperatures during race hours for each year.
Detailed History
| Year | Conditions | Low / High | Rain | Dew Point | Score |
|---|---|---|---|---|---|
2025 |  | 61°/62° | Light | 60° | |
2024 |  | 55°/69° | - | 46° | |
2023 |  | 71°/76° | Light | 71° |