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    Snow arrives as the workweek ends

    NATIONAL WEATHER SERVICE

    Greater Boston faces more bitterly cold conditions Friday as meteorologists warn that the evening commute will probably be affected by a fast-moving snowstorm as the workweek ends.

    Temperatures in the Boston area will slowly crawl upwards into the 20s, where they will remain into the evening as the snowfall begins, according to the National Weather Service. Accumulation is expected to be light in Boston but could reach several inches along the southern portion of Massachusetts.

    “It’ll be less than an inch, probably starting around 5 to 6 p.m. this evening” in Boston, weather service meteorologist Lenore Correia said Friday afternoon. “It’ll probably end around midnight; the heaviest will probably be around 10 p.m.”

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    Areas south of the city, including Cape Cod, the Islands, and the southernmost sections of Bristol and Plymouth counties, might get more snow — 3 to 4 inches — before the system sails past later in the evening, forecasters wrote.

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    Because the snow won’t fall until early evening, skies will be mostly sunny in Boston throughout Friday. Winds should be mild during the workday, gusting only to about 10 miles per hour, forecasters wrote.

    Temperatures will be relatively constant, staying in the 20s before sliding down into the teens in Greater Boston and even lower away from the coast and urban communities, according to the weather service.

    While snowfall around the city will be lighter Friday evening, Correia advised that evening commuters should still be aware of more dangerous road conditions as the storm rolls through.

    “Anything that is untreated will definitely be slippery,” she said. “Just take it slow; road conditions are not the best.”

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    The weekend promises to stay cold, especially at night, Correia said. Temperatures Friday and Saturday night could fall into the teens, before rising to the low 30s Saturday and Sunday.

    Some wind could also blow through Saturday afternoon, although Correia said gusty conditions are not expected to last.

    “We’re going to get a little gusty in the afternoon, so maybe 25 miles [per hour] for gusts in Boston, but it looks like it’ll be short lived,” she said. “It’ll probably peak around 3 p.m.”

    Correia also said there is a possibility of more light snowfall early Monday morning, dropping around a half inch of snow around Boston.

    John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.