Spectators are bundled up in rain gear along Boylston Street in Boston, while determined runners with the finish line on their minds make their way from Hopkinton in a rainy, chilly Boston Marathon.
Forecasters say conditions are going to get worse as the day wears on. Participants and spectators can expect blustery winds, soaking rain, and temperatures in the 40s all along the 26.2-mile course Monday afternoon, during the 119th running of the event
“We’ve been here since 6 a.m., and we’re freezing,” said Penny Medeiros, 67, of Swansea, as she stood outside Hynes Convention Center. “We went back to the car to get every blanket and towel we had.”
Amy Germano, her niece, stood with a cotton blanket around her Patriots coat.
“It’s a lot colder than I thought it would be,” said Germano, 36, a medical assistant from Berkley, who is attending the Marathon for the first time with her aunt and mother.
At a pre-Marathon dinner for runners and their families at City Hall Plaza on Sunday afternoon, Boston Mayor Martin J. Walsh jokingly promised the crowd he’d do what he could to keep the rain at bay.
But forecasters said the rain, which began in earnest around noon, is expected to continue through the evening, forecasters said.
A southeasterly wind will sweep the region, keeping temperatures in the mid-40s through the day.
“It will be a struggle to get to 50 in Boston,” said Alan Dunham, a National Weather Service meteorologist.
Due to the forecast, the town of Lexington canceled its Patriots Day parade, an event that usually coincides with the Marathon.
Winds from 10 to 15 miles per hour are expected throughout the Marathon, but they may accelerate up to 20 miles per hour, with 30 mile-per-hour gusts toward the Boston end of the course. Wind chill is predicted to be in the high 30s or low 40s.
The Boston Athletic Association recommends proper cold weather running attire — layers of non-bulky clothing, with the outer layers waterproof and wind-resistant. To prevent heat loss through exposed body parts, the association suggests covering heads and hands, and wearing long sleeves and knit hats.
For racers waiting in Hopkinton, heavier clothing is suggested before the start of the race. The clothes can be discarded before each wave of participants, the association said in a weather advisory.
Racers are advised to stay hydrated and slow down more than usual at drink stations to avoid spilling liquid on themselves in the cold.
The one recent Marathon with similar cold, windy, and wet conditions was in 2007, when temperatures in the high 40s mixed with 20- to 30-mile-per-hour winds and torrential rain, according to the Marathon weather history guide.
Before 2007, the only rainy Marathon Monday was in 1970, though there were years with sleet or snow squalls before 1967, according to the 2014 Marathon weather history.
Globe correspondents Raffaela Kenny-Cincotta, Kiera Blessing, and Aneri Pattani contributed to this report. Jennifer Smith can be reached at firstname.lastname@example.org