Friday's clouds and mild temperatures should last through the night but the sky should clear in time for a sunny Saturday and possibly for much of Sunday, the National Weather Service in Islip said.
The odds of rain on Sunday after midday have fallen to 20%, though by nightfall, the chances soar to 90%, the weather service said.
And Monday almost undoubtedly will be rainy, though all of the next several days — including New Year's Eve — should remain mostly clear and clement.
Until then, Friday's daytime high is expected to be a balmy 54 degrees — about 20 degrees above normal.
Saturday, expected to be mostly sunny, should also be a mild 48 degrees though the night time temperature will fall to nearly freezing, the weather service said.
Daytime thermometers should remain in the mid- to upper-40s through Thursday, the weather service said.
New Year's Eve on Tuesday will be a chilly 33 degrees with some clouds, though they should vanish by the first day of 2020.