Summer seems to be making a fast exit.
Long Islanders should brace for some downright chilly nights this week, with temperatures at times dipping into the 40s, according to the National Weather Service.
Sunday will be sunny, with the high temperature near 72, while Sunday night will be in the upper 50s, said Joe Pollina, meteorologist with the service's Upton bureau.
Monday will be mostly cloudy with a chance of showers after about 9 a.m. Highs will be in the low 70s.
But a cold front moving in overnight will push Monday's lows down into the upper 40s to low 50s, Pollina said.
Sunny skies will return Tuesday, with highs in the upper 60s. Lows on Tuesday will remain in the upper 40s to low 50s.
Thank Canada for the cooler temperatures this week, brought down to Long Island through a high-pressure system, Pollina said.
But as the week continues, a high-pressure system will begin to bring in warmer air from the south, Pollina said.
Long Island will begin to see the fruits of this system on Wednesday, which will be sunny with highs in the upper 60s and low 70s. Lows will also increase Wednesday night, in the low to mid-50s.
Thursday will be mostly sunny, with highs in the low to mid-70s and lows in the upper 50s to low 60s.
Friday will be mostly sunny, with highs in the low to mid-70s. The next chance of rain comes on Friday night, with lows in the upper 50s to low 60s.