Brutal Boston weather forecast
- Forecasts show Marathon Monday could produce the coldest high temperature on record for the Boston Marathon. - Weather models cited by local outlets warned of unusually cold daytime conditions that could affect performance and spectator comfort. - Organizers and broadcasters are preparing for a grittier-than-usual race environment that will challenge elite and recreational runners alike. (wmur.com, boston.com)
Boston’s Marathon Monday is shaping up as one of the coldest race days in the event’s history, with highs only in the upper 40s to low 50s. (boston.com) WMUR reported on April 19 that the 2026 race “could see” the coldest high temperature on record, with the current record high listed at 48 degrees from the 2009 marathon. WCVB said Boston’s average high for April 20 is 58 degrees, about 10 degrees warmer than the forecast for Monday. (wmur.com, wcvb.com) By early Monday, Boston.com cited the National Weather Service forecast calling for temperatures in the 30s at daybreak, rising only into the upper 40s to low 50s by early afternoon. Local forecasters at WCVB and NBC10 Boston said a west to west-northwest breeze could act as a tailwind for runners while leaving spectators standing in raw conditions for hours. (boston.com) The race is the 130th Boston Marathon, and the Boston Athletic Association says about 30,000 participants are on the course from Hopkinton to Boylston Street on Monday, April 20, 2026. That means the weather reaches far beyond the elite fields and into the experience of thousands of recreational runners, volunteers, and families lining the route. (baa.org) Cold alone does not automatically slow a marathon, and some forecasts called the setup “great for runners” because cooler air reduces overheating risk. The same forecasts warned that the combination of wind, morning temperatures in the 30s, and a possible passing shower could make waiting areas and finish-line viewing much tougher than the running itself. (boston.com, wcvb.com) Boston Marathon weather has swung wildly before, from the soaking 2018 race to heat waves in earlier decades. Boston.com’s weather history recap said the 2018 race started at 38 degrees in Hopkinton, while the Boston Athletic Association’s historical record includes the 97-degree race of 1909. (boston.com, boston.com) The Boston Athletic Association says the race has been held since 1897, which is why a forecast that threatens a record cold daytime high stands out even in a city used to erratic April weather. By Monday morning, the working expectation was a bright but wintry start, clouds building later, and a finish-line crowd dressed more for March than late April. (baa.org, boston.com)
