Boston Marathon 2026 Forecast Predicts Cool, Breezy Conditions for Race Day The Boston Marathon is set to take place on April 21, 2026, with weather forecasts indicating a cooler and breezy race day. A front bringing showers is expected to clear Eastern Massachusetts before sunrise on Marathon Monday, leaving behind dry conditions for the event. Temperatures are projected to remain in the 40s throughout the day, with morning temperatures potentially reaching the upper 30s or low 40s and afternoon highs climbing only to the mid- to upper 40s. Cool air from Canada is anticipated to move in quickly behind the front that passes Sunday evening, reducing moisture in the region and clearing skies. This shift is expected to result in temperatures significantly below the seasonal average for the Boston area. Early indications suggest race-morning temperatures starting in the upper 30s or low 40s, with afternoon highs only reaching the mid- to upper 40s. Wind chills are projected to lower the perceived temperature to the mid-30s in the morning and the low 40s by afternoon. Wind speeds are expected to range from 15 to 20 mph, with the wind chill making the cooler air feel brisk, especially at the start for runners and throughout the day for spectators along the route. Precipitation remains a possibility, with some models suggesting a spot sprinkle or light flurry could linger into Monday morning. However, the majority of forecasts indicate that the front will clear the region before the wheelchair race begins, leaving the marathon course dry. The Globe’s WeatherHQ, GFS, and European models all show Eastern Massachusetts as dry early Monday, with showers exiting Sunday night. Historical data provides context for the expected conditions.#boston_massachusetts #boston_marathon #weatherhq #gfs #european_models
