Lingering high pressure will deliver clear and unseasonably warm conditions to Long Island for the next few days, the National Weather Service said Friday.
The only glitch is a slight chance of rain Sunday night, according to the service's Upton office.
Tim Morrin, a meteorologist at the Upton office, said residents should enjoy the unseasonably warm temperatures -- between the high 40s and low 50s -- expected Friday and Saturday.
Because on Sunday, there's a slight chance of rain, and by Monday, temperatures slip back to normal for this time of year, with daytime highs in the 30s and nighttime lows in the 20s.
"After the high pressure that's over the Appalachians moves toward the coast late Saturday into early Sunday, there's also a storm system coming in from the Southern Plains that will scoot south of us," Morrin said.
That system calls for about a 30 to 40 percent chance of light rain for Nassau and Suffolk counties and even some snow north and west of New York City, Morrin said.
A cold front rides the back of the passing storm system; starting Monday, that front again provides sunshine and clear conditions but slightly colder temperatures, Morrin said.
"As we start the new week, and even through New Year's Day, we see temperatures in the 30s during the day and in the 20s at night, which is about where we should be this time of year," Morrin said.
No precipitation is expected during the stretch, and winds for the most part will be relatively mild, he said.