The brightest and warmest day will likely be Saturday with highs in the 60s to lower 70s and early fog to partial sunshine. Late Sunday the front will start moving east, and I think it will be a rainy and stormy Sunday night with those showers and storms lasting through the first half of Memorial Day as the front slowly drifts through.
We start off wet on Friday with the heaviest of the downpours advancing northeastward, stretching the line of downpours from Cape Ann all the way to Downeast Maine, along with the onshore wind. Combined with the warm, humid atmosphere, we'll be watching for not only scattered showers but also strong thunderstorms.
I expect a blend of clouds and sunshine with inland highs reaching and exceeding 70 degrees, but areas along the immediate shore will stay significantly cooler, especially Sunday. Showers will taper off through the day on Friday as the low pressure system tracks into the Canadian Maritimes.
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Behind this system, daily high temps drop back into the upper 70s, which is about typical for this time of year.
Sunday: Showers likely and possibly a thunderstorm, mainly after 2pm. Winds of up to 25 miles per hour and thunderstorms are also possible. Chance of precipitation is 80 percent.
Thursday: Cloudy and showers likely with a high near 65 degrees and a low of about 54 degrees. Northwest wind 7 to 9 miles per hour. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
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We could get some sporadic showers Friday, too, but there's a smaller chance of it. Northwest wind 8 to 15 miles per hour.
Although it will be mostly sunny on Sunday, the high temperature will remain in the mid 60s, the weather service says.
Saturday Night: Mostly cloudy, with a low around 57. Partly sunny, with a high near 67.
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Friday: A chance of showers. Cloudy, with a low around 56.