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Forecast

Here’s your latest Boston Marathon forecast

By Ken Mahan Globe Staff,Updated April 15, 2024, 7:09 a.m.
The starting line area of the Boston Marathon in Hopkinton last year.David L. Ryan/Globe Staff

It’s a day unlike any other in the city of Boston. About a half a million people today will line the Boston Marathon race route stretching from Hopkinton to Boston, supporting the more than 29,000 casual to elite runners accomplishing the feat of completing a 26.2-mile course. And it’s shaping up to be a fantastic spring day from sunrise to sunset.

You can plan on mostly to partly sunny skies wherever you are along the race route, with temperatures starting the day in the low 50s pre-race (the men’s wheelchair division kicks off the race at 9:02 a.m.) and quickly rising to the low to mid-60s by noon in Greater Boston — a bit on the warm side for runners.

But there will be a slight breeze from the west/northwest throughout the day — a barely noticeable 5 to 12 miles per hour to spectators but a helpful tailwind for runners. Also, the passing of showers across New England Sunday night has welcomed dry air into the area, knocking humidity values down to 30% to 60%, which should keep runners comfortable.

Other than a few leftover small puddles, all signs point to a wonderful day, starting with the men’s wheelchair race at 9:02 a.m.

If you’re heading to a particular point along the marathon route, here’s a town-by-town course forecast to see how Monday’s weather plays out during prime viewing and racing event times:

Hopkinton

Here’s where it all begins, the Marathon starting line, and where runners begin the race heading (mostly) downhill. Temperatures will slowly rise from 50 to 59 degrees between 8 a.m. and noon.

The starting line in Hopkinton looks partly cloudy with temperatures in the 50s through the morning.BOSTON GLOBE

Ashland

Miles 2 through 5 run along Route 135, with small hills leading to the course’s first uphill test that may fatigue runners right as they enter Framingham.

Temps inch closer to 60 as we reach mid-day across Ashland.BOSTON

Framingham

Rolling hills become more prominent along Framingham’s stretch of marathon mileage, through around Mile 8.

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Late morning to early afternoon across Framingham, there will be warming temperatures and lots of sunshine.BOSTON GLOBE

Natick

Miles 9 through 12 cut through Natick, including the 10-mile marker right by the town center.

A slight bump in the wind will be evident across Natick in the early afternoon, with temps reaching their peak.BOSTON GLOBE

Wellesley

Home to the loud and proud “scream tunnel,” mainly Wellesley College students making roaring cheering noise in support of runners. The halfway point is here as well. Runners will run through Mile 16 in Wellesley as they go from Route 135 to Route 16.

Partly cloudy skies and warm temperatures through the halfway mark.BOSTON GLOBE

Newton

This is where four hills that make or break runners are located, including the infamous Heartbreak Hill. Participants will climb 175 feet of elevation while trekking through Newton.

Temperatures stay mild as runners push through Heartbreak Hill.BOSTON GLOBE

Brookline

Mostly downhill leading to Boston through Mile 24.

The daily outlook for Brookline: Early-morning and evening temps in the 50s, mid-day and afternoon in the low 60s.BOSTON GLOBE

Boston

The finish line awaits on Boylston Street, where the occasional breeze will turn into a headwind, but unlikely with today’s beautiful weather. Here’s the full day forecast for Boston:

Marathon forecast in Boston: Mid- to upper 50s in the morning and after 5 p.m., into the low 60s.BOSTON GLOBE


Ken Mahan can be reached at ken.mahan@globe.com. Follow him on Instagram @kenmahantheweatherman.

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