Potomac River Run Marathon (Fall)

Carderock, MD, USA • October 17, 2026

Race Day Weather

50°

66° high

Breezy

Dry

Mild start, steady conditions ahead

Runners will face temperatures starting at 50°F and rising to 66°F. Winds will be from the SW at 10 mph, with gusts up to 29 mph. With humidity at 59% and a low dew point, conditions are generally favorable, but runners should stay hydrated and monitor their pacing as temperatures rise.

Race day forecast available in 193 days

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Pre-raceRace windowPost-race

Course Map

FAQ

When is the 2026 Potomac River Run Marathon (Fall)?

The 2026 Potomac River Run Marathon (Fall) will be held on Saturday October 17, 2026.

Is the Potomac River Run Marathon (Fall) a Boston Marathon Qualifier?

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

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

The forecast calls for a high of 66°F and a low of 50°F with a 0% chance of rain.

Historical Weather

Based on 2 years of data

Avg Temp

73°F

L:47° H:73°

RunScore

Conditions

Rain Freq

0 of 2 yrs

Wind6mph

Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Conditions	Low / High	Rain	Dew Point	Score	Results
2025 Potomac River Run Marathon (Fall) Partly cloudy throughout the day. 2025		51°/74°	-	46°
2024 Potomac River Run Marathon (Fall) Clear conditions throughout the day. 2024		43°/73°	-	38°

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