Weather across Long Island is expected to fluctuate this week...

Weather across Long Island is expected to fluctuate this week with record warmth and rain forecast for Monday, followed by a cool down heading into Thanksgiving, according to the National Weather Service. Credit: Weather Underground

Weather across Long Island is expected to fluctuate this week with record warmth and rain forecast for Monday, followed by a cool-down heading into Thanksgiving, according to the National Weather Service in Upton.

It should be partly sunny Sunday with temperatures rising into the low 50s.

Monday, Long Island could see rain and record highs, with temperatures forecast to reach 66 degrees in Islip. The previous record of 63 degrees in Islip was set in 2001, NWS meteorologist John Murray said.

The weather service also issued a wind advisory Monday from 4 a.m. to 6 p.m. for Nassau and Suffolk counties. Winds are expected to be between 20 to 30 mph with gusts up to 50 mph across Long Island.

The winds could bring down tree branches and cause power outages. There is also a driving advisory for high-profile vehicles.

Tuesday, temperatures should cool into the 50s and upper 40s with sunny skies. Then, a second coastal storm and low pressure system is expected to move over the region Wednesday, Murray said. Forecasters are unsure how much precipitation the storm may bring, but a dusting of snow is possible if temperatures are cool enough Wednesday night.

Thanksgiving is forecast to be sunny, but cool, with highs in the low 40s.

Overnight lows are expected in the low 30s starting Tuesday and dipping into the 20s by the end of the week.

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