Race Day Weather
Cool start, moderate breeze
Runners will face temperatures starting at 50°F and climbing to a comfortable 59°F. Winds will be from the SSE at 11 mph, with gusts up to 25 mph, creating a moderate breeze throughout. With humidity at 66% and a dew point of 43°F, hydration strategies should be in place, but no pace adjustments are necessary.
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
FAQ
When is the 2026 Charles River Marathon?
Is the Charles River Marathon a Boston Marathon Qualifier?
What will the weather be like for the 2026 Charles River Marathon?
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° |