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Race Overview
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.
WikipediaFAQ
When is the 2026 Charles River Marathon?
The 2026 Charles River Marathon will be held on Sunday May 3, 2026.
Is the Charles River Marathon a Boston Marathon Qualfier?
Yes, the Charles River Marathon is an official Boston Marathon qualifier.
Charles River Marathon Weather History
Charles River Marathon Weather Averages
Average Temp: 65°, Average Low: 61°, Average High: 71°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 62° | 64° | 65° | 67° | 67° | 68° | 68° | 68° |
| Feel | 62° | 64° | 65° | 67° | 67° | 68° | 68° | 68° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 6mph | 7mph | 7mph | 9mph | 8mph | 8mph | 9mph | 8mph |
| Dew | 59° | 60° | 59° | 59° | 59° | 59° | 58° | 58° |
| RunScore |  |  | | | | |  | |
Charles River Marathon 2025
Sep 7, 2025
Cloudy skies throughout the day with a chance of rain throughout the day.
Low: 60°, High: 67°, Heavy Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  61° | 62° | 62° | 62° | 61° | 62° | 61° | 62° |
| Feel | 61° | 62° | 62° | 62° | 61° | 62° | 61° | 62° |
| Rain | light | light | light | light | moderate | light | light | light |
| Wind | 4mph | 8mph | 7mph | 7mph | 6mph | 6mph | 5mph | 6mph |
| Dew | 60° | 60° | 60° | 60° | 60° | 60° | 59° | 60° |
| RunScore | | | | | | | | |
Charles River Marathon 2024
Sep 8, 2024
Partly cloudy throughout the day.
Low: 53°, High: 70°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  55° | 58° | 61° | 63° | 65° | 67° | 69° | 69° |
| Feel | 55° | 58° | 61° | 63° | 65° | 67° | 69° | 69° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 10mph | 13mph | 11mph | 14mph | 11mph | 9mph | 14mph | 12mph |
| Dew | 48° | 48° | 47° | 46° | 45° | 45° | 44° | 44° |
| RunScore | | | | | | | | |
Charles River Marathon 2023
Sep 10, 2023
Cloudy skies throughout the day with rain.
Low: 69°, High: 76°, Moderate Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  71° | 73° | 74° | 75° | 75° | 76° | 74° | 72° |
| Feel | 71° | 73° | 74° | 75° | 75° | 76° | 74° | 72° |
| Rain | - | - | - | - | - | - | light | light |
| Wind | 3mph | 0mph | 3mph | 5mph | 8mph | 8mph | 8mph | 7mph |
| Dew | 70° | 71° | 71° | 71° | 71° | 71° | 71° | 70° |
| RunScore | | | | | | |  | |