Temperatures in the 40s forecast for much of Long Island Tuesday night — coldest air of the season

Long Islanders will wake up to the season's coldest morning so far on Wednesday, as temperatures were expected drop to as low as the upper 30s in some parts of the Island.

But the early autumn chill won't last long.

"As the sun rises [on Wednesday], it should warm up pretty quickly," National Weather Service meteorologist Joe Pollina told Newsday on Tuesday evening. "Between 10 a.m. and 11 a.m., most areas, if not all areas, should be in the 50s."

NewsdayTV meteorologist Geoff Bansen said most of Long Island will see lows in the mid-40s, while areas near the water will be in the lower 50s.

Forecasters said areas near the pine barrens were expected to feel the coldest.

“Rocky Point and Coram over to Riverhead, those areas will get down into the 30s,” weather service meteorologist Bill Goodman said Tuesday. Bridgehampton was forecast to drop to 39 degrees.

While temperatures may be chilly, there was no risk of frost for Long Island, Bansen said.

The Hudson Valley, most of Connecticut and parts of Massachusetts, Vermont and Maine are under a frost advisory on Wednesday morning.

Long Island typically doesn't sees its first frost until late October at earliest, Bansen added.

The colder conditions follow a chilly Tuesday morning, as many Long Islanders woke up to temperatures in the upper 40s and lower 50s.

But don’t get out your winter clothes just yet.

Temperatures are expected to climb into the mid-60s to lower 70s Wednesday afternoon and will stay that way into the weekend.

“This cool shot that we’re having is fairly short-lived,” Goodman said.

Lows will drop into the 50s beginning Wednesday night — not as cold as Tuesday, but enough to bring a sweater if venturing outside.

“Once the sun goes down, it cools up pretty quick,” Goodman said.

A chance of showers will return Sunday night into Monday.

Forecasters said they are keeping an eye on a weather disturbance in the Gulf Coast. Goodman said while it is too soon to confirm if it will turn into a tropical storm or hurricane, it should not greatly affect Long Island in either case.

Newsday's Nicholas Grasso contributed to this story.