Potomac River Run Marathon

Carderock, MD, USA • May 2, 2026

Race Day Weather

56°

72° high

Breezy

Dry

Cool start, warming up

Runners will face a starting temperature of 57°F, gradually rising to 72°F. Winds will be from the SSW at 10 mph, with gusts reaching 28 mph. With humidity at 62%, it's advisable for runners to adjust their pace as temperatures increase, ensuring proper hydration throughout the race.

Race day forecast available in 25 days

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Pre-raceRace windowPost-race

Course Map

FAQ

When is the 2026 Potomac River Run Marathon?

The 2026 Potomac River Run Marathon will be held on Saturday May 2, 2026.

Is the Potomac River Run Marathon a Boston Marathon Qualifier?

Yes, the Potomac River Run Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 Potomac River Run Marathon?

The forecast calls for a high of 72°F and a low of 56°F with a 0% chance of rain.

Historical Weather

Based on 2 years of data

Avg Temp

67°F

L:59° H:67°

RunScore

Conditions

Rain Freq

50%

1 of 2 yrs

Wind8mph

Dew57°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Conditions	Low / High	Rain	Dew Point	Score
2025 Potomac River Run Marathon Partly cloudy throughout the day with late afternoon rain. 2025		66°/80°	-	62°
2024 Potomac River Run Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2024		52°/54°	Light	51°

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