Runners Brace for Cool Boston Marathon with Helpful Winds

Cooler air from Canada is set to significantly impact the upcoming Boston Marathon, bringing temperatures approximately 10 to 15 degrees below the seasonal norm. Race morning on Monday is forecasted to begin in the upper 30s to low 40s, with afternoon highs expected to climb only into the mid- to upper 40s, potentially reaching 50 degrees. This contrasts sharply with last year's milder conditions and the decade's average high of 61 degrees.

A helpful tailwind, estimated at 10 mph with gusts up to 15-20 mph, is predicted to blow from the northwest or west, potentially assisting runners. While not as strong as the ideal tailwind of 2011, any such wind can offer an advantage. Spectators should prepare for brisk conditions, with wind chills feeling like the mid-30s in the morning. A slight chance of spotty showers exists late morning or early afternoon, but overall, decreasing clouds and intermittent sun are expected throughout the day.