Historical Race Day Weather for the Potomac River Run Marathon

May 2, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 49°F 9°C

Start Humidity 59% Humidity

Wind NNW 13 mph Wind

Race day high 62°F 17°C

Race day low 49°F 9°C

PR Score 99.53 Normal score 98.84

Course Score 99.53 Course-only Score

Course-adjusted pacing

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May 3, 2025

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 71°F 22°C

Start Humidity 70% Humidity

Wind SW 10 mph Wind

Race day high 83°F 28°C

Race day low 67°F 19°C

PR Score 95.36 Normal score 98.84

Course Score 99.53 Course-only Score

May 4, 2024

Race day snapshot

Rain, Overcast

Start Line Conditions

Start Temp 53°F 12°C

Start Humidity 90% Humidity

Wind ESE 6 mph Wind

Race day high 56°F 13°C

Race day low 52°F 11°C

PR Score 98.97 Normal score 98.84

Course Score 99.53 Course-only Score

May 6, 2023

Race day snapshot

Clear

Start Line Conditions

Start Temp 53°F 12°C

Start Humidity 80% Humidity

Wind N 2 mph Wind

Race day high 72°F 22°C

Race day low 46°F 8°C

PR Score 98.89 Normal score 98.84

Course Score 99.53 Course-only Score

May 1, 2022

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 51°F 11°C

Start Humidity 79% Humidity

Wind ESE 2 mph Wind

Race day high 70°F 21°C

Race day low 49°F 9°C

PR Score 99.08 Normal score 98.84

Course Score 99.53 Course-only Score

May 2, 2021

Race day snapshot

Clear

Start Line Conditions

Start Temp 54°F 12°C

Start Humidity 53% Humidity

Wind SW 5 mph Wind

Race day high 86°F 30°C

Race day low 52°F 11°C

PR Score 98.75 Normal score 98.84

Course Score 99.25 Course-only Score

May 5, 2019

Race day snapshot

Drizzle

Start Line Conditions

Start Temp 64°F 18°C

Start Humidity 97% Humidity

Wind E 3 mph Wind

Race day high 67°F 19°C

Race day low 60°F 16°C

PR Score 95.37 Normal score 98.84

Course Score 99.25 Course-only Score

May 6, 2018

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 57°F 14°C

Start Humidity 83% Humidity

Wind ENE 2 mph Wind

Race day high 75°F 24°C

Race day low 57°F 14°C

PR Score 97.88 Normal score 98.84

Course Score 99.25 Course-only Score

May 7, 2017

Race day snapshot

Sunny

Start Line Conditions

Start Temp 47°F 8°C

Start Humidity 73% Humidity

Wind W 7 mph Wind

Race day high 61°F 16°C

Race day low 46°F 8°C

PR Score 99.25 Normal score 98.84

Course Score 99.25 Course-only Score

May 1, 2016

Race day snapshot

Cloudy

Start Line Conditions

Start Temp 55°F 13°C

Start Humidity 84% Humidity

Wind SE 6 mph Wind

Race day high 66°F 19°C

Race day low 52°F 11°C

PR Score 98.59 Normal score 98.84

Course Score 99.25 Course-only Score

May 3, 2015

Race day snapshot

Clear

Start Line Conditions

Start Temp 52°F 11°C

Start Humidity 80% Humidity

Wind NW 3 mph Wind

Race day high 79°F 26°C

Race day low 51°F 11°C

PR Score 99.25 Normal score 98.84

Course Score 99.25 Course-only Score

May 4, 2014

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 56°F 13°C

Start Humidity 61% Humidity

Wind SW 6 mph Wind

Race day high 73°F 23°C

Race day low 50°F 10°C

PR Score 99.25 Normal score 98.84

Course Score 99.25 Course-only Score

May 5, 2013

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 49°F 9°C

Start Humidity 71% Humidity

Wind NE 8 mph Wind

Race day high 65°F 18°C

Race day low 43°F 6°C

PR Score 99.25 Normal score 98.84

Course Score 99.25 Course-only Score