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    Autumnal equinox arrives Saturday night with fall weather to match

    A bit of a fall flare was on display in Milton Saturday as a maple tree has already started to show its autumnal colors.
    John Tlumacki/Globe Staff
    A bit of a fall flare was on display in Milton Saturday as a maple tree has already started to show its autumnal colors.

    Fall officially began Saturday night, and the weather is right on-season.

    “It’s looking really nice for this weekend and well into the work week,” according to Alan Dunham, a meteorologist at the National Weather Service.

    In Boston, the mercury got to 73 degrees just after 2 a.m. before dropping gradually to a low of 68 at 3:59 p.m., meteorologist Kim Buttrick said.

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    An overnight low going into Sunday will likely be in the low 50s, Dunham said.

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    Outside of Interstate 495, the overnight low could be even cooler with temperatures as low as the mid-40s, Dunham said.

    The autumnal equinox falls at 9:54 p.m.

    “There’s going to be a noticeable autumnal chill [Sunday] and into Monday,” Buttrick said.

    In Boston, highs will likely hit the upper 60s Sunday before a cool day Monday comes with a high in the upper 50s, Dunham said.

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    High temperatures in the upper 60s are expected to return Tuesday and Wednesday, along with a chance of rain.

    Lucas Phillips can be reached at lucas.phillips@globe.com.