-->
Boston Cut-off Time Prediction Contest

Boston Cut-off Time Prediction Contest

Predict the 2027 Boston Cut-off Time and win a great prize and bragging rights among all your running friends.

Submit Your Prediction

Marathon Pace Bands

Marathon Pace Bands

Run the Right Pace in Your Next Marathon

Nearly 500 marathon courses.
Ships same or Next Day

Best Boston Marathon Qualifiers for 2026

Best Boston Marathon Qualifiers

It's here! Our annual list of the year's
best marathons to help you qualify for the Boston Marathon.

2026 IS HERE!




Historical weather

Historical Race Day Weather for the Potomac River Run Marathon

See historical race day weather for the Potomac River Run Marathon, including start temperature, humidity, wind, race day temperatures, PR score, and course score.

Weather Averages for Last 13 Years

Race day snapshot
Clear
Clear
Most common race morning weather across the last 13 years.
Start Line Conditions
Start Temp 55°F 13°C
Start Humidity 75% Humidity
Wind SW 6 mph
Race day high 70°F 21°C
Race day low 52°F 11°C
PR Score 98.42 Weather-influenced race day scoring
Course Score 99.36 Course-only Score

Race Day Weather by Year

Most recent years appear first so you can quickly compare start conditions, temperatures, wind, and scores across different editions of the race.

May 2, 2026

Race day snapshot
Partially cloudy
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
Marathon Pace BandsLive Pace Band phone preview

Course-adjusted pacing

Want to run your best Potomac River Run Marathon?

Potomac River Run Marathon Pace Bands are adjusted for the specific terrain of the course, your goal time, and pacing strategy.

Build your Potomac River Run Marathon pace band

Easy to useCourse-aware pacing, goal-time based splits, and a cleaner race day plan.See all pace bands