Cool air from Canada is moving in behind Sunday evening’s front, and for Greater Boston that usually means one thing: less spring warmth, more “bundle up” reality.
According to Misryoum newsroom reporting, that cooler air should settle in pretty quickly by early Monday, wicking away moisture. If the pattern holds, clouds should thin and break up as the day goes on—though “nice weather” still comes with a bite. Temperatures are expected to drop noticeably below the seasonal norm for Monday, roughly 10 to 15 degrees colder than average for the Boston area.
Race-morning temperatures are trending toward the upper 30s or low 40s, while afternoon highs look like they’ll only climb into the mid- to upper 40s. For runners, that can actually be a plus—cooler conditions can help keep efforts from overheating. For spectators, it’s a different story. You may want layers you can move in, plus something for the hands and maybe a scarf, because the wind chill is the part folks will feel fast.
Misryoum editorial desk noted that wind speed and direction are harder to pin down this far out, but early indications point to a brisk westerly flow. The winds could be pushing around 15 to 20 mph across the region, making that already-cool air feel even colder, especially near the start for runners and all day along the route for people watching. The wind could also matter for performance. There’s no guarantee it lands perfectly in the “ideal tailwind” category, but any tailwind can help.
There’s also the rain question—timing can still shift. Misryoum analysis indicates there could be a spot sprinkle or even a flurry lingering into Monday morning, but the more likely scenario is that Sunday’s front clears the region before the wheelchair race begins Monday morning. Misryoum editorial team stated that dry conditions are shown for Eastern Mass. early Monday in multiple forecast approaches, with showers exiting Sunday night. That dry window matters, because even small changes in timing can change what people expect to see on course.
Zooming out, the marathon-weather pattern over the past two decades has been a mixed bag—sometimes warm, sometimes stubbornly cold. Misryoum newsroom reported that the average daily high over the past 10 marathons has been 61 degrees, and last year’s high hit 73 under clear conditions after scattered showers passed the night before. The coldest marathon day since 2000 was in 2018, with the high reaching only 43, and this year could end up closer to that colder end than the warmer one.
And then there’s the “how it feels” part. Around 11 a.m. Monday, the forecast wind chills are expected to place the region somewhere around the mid-30s in the morning and the low 40s during the afternoon. By the morning of Marathon Monday, wind chills across Greater Boston should sink to the mid-30s.
This is still the kind of forecast that can wiggle—one tiny timing shift here, a flurry that hangs on there—and Misryoum says weather checks will continue all week leading up to the Marathon on April 20. In the meantime, if you’re planning to stand outside for hours, expect a chilly day where even the air itself feels like it has momentum. I’ll be honest: the thought of that wind hitting around the start, like a cold hand on the cheek—well, it’s not exactly romantic, but it’s memorable. Also, if it stays dry, people can focus on the race instead of umbrellas, which is probably the best-case scenario… even if nobody really knows yet.
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