A wave of moisture will ride along a cold front that is lurking just off the New England coastline on Sunday.
That will result in rain for Southern and Eastern portions of the area.
The rain will begin in parts of Southeastern Connecticut, Rhode Island, and Southeastern Massachusetts Sunday afternoon, and continue into Sunday night as it expands towards Coastal Maine. The rain will be heaviest over Cape Cod, the Islands, and up into DownEast Maine.
Some localized amounts of 1-2" are possible in those areas, while north and west of Boston it stays primarily quiet and dry.
As the rain is ending overnight, cold air will be rushing in. That may end the precipitation as a few wet snowflakes in the Boston area, but there won't be any accumulation and we'll wake up to sunshine Monday morning.
Farther north, however, the switch to snow will happen a little sooner, and the precipitation will last a bit longer. That means in portions of Eastern Maine, especially in Aroostook and Washington Counties, we'll find snowfall totals on the order of a dusting-2".
The snow will be falling until 8-10 AM, so the morning drive will be a bit slower than normal in those areas as well.
Much colder air works in for Monday and Tuesday, with highs only in the 30s and 40s despite abundant sunshine.
Here are some useful links to make sure that you're prepared: