Potomac River Run Marathon
Race Day Weather
Mild start, warming up later
Runners will face temperatures starting at 57°F and rising to 71°F during the race. Wind will be light, with a max of 8 mph, and humidity will average 60%. Due to the warming trend, runners should consider adjusting their pace as temperatures rise and remain mindful of hydration.
Pace Calculator
Get forecast alerts for Potomac River Run Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Potomac River Run Marathon and Half Marathon start and finish at Fletcher's Cove on the C&O Canal Towpath in Washington, D.C. The out-and-back course follows the Potomac River past a series of historic canal locks and is USATF certified as a Boston Marathon qualifier. The race is organized by the Safety and Health Foundation, a nonprofit that directs proceeds to charity projects including schools and a health clinic in Africa. It is one of three marathon and half marathon events the foundation holds each year as part of its Grand Prix series.
