Chilly Halloween night predicted for Long Island, with frost out east, during clear, sunny weekend

A clear, sunny weekend is in store for Long Island, with Halloween night bringing chilly weather in the high 30s for trick or treaters.

The National Weather Service said this weekend there will be a "seasonably chilly airmass" in place in the region and frost is predicted for some parts of Long Island Saturday night into Sunday.

"Widespread frost conditions likely, scattered freeze conditions possible, across eastern LI, southern CT and southern Westchester county Saturday night/early Sunday," said the weather service's forecast discussion Friday afternoon.

Long Island is in a period without rain, which the weather service is calling the driest stretch of the year, with several more dry days predicted. The next chance of showers is predicted for Thursday. 

After a clear, breezy Friday night in the low 40s and gusts of 25 mph, Saturday will see a high in the high 50s during the day with lighter winds, dropping to the high 30s at night. Sunday will feature a slightly warmer day close to 60 with winds of about 11 mph. 

The crisp fall weather will also set the stage for the 55th running of the TCS New York City Marathon on Sunday. 

Remember that Daylight Saving Time also officially ends overnight Saturday into Sunday, when clocks get set back one hour.

There is a small craft advisory is in effect for the Long Island Sound east of Orient Point from through 3 a.m. Saturday and for all Atlantic Ocean waters through 2 a.m. Saturday. "Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions," the advisory states. Wave height of 3 to 5 feet are expected, the weather service said.

By John Valenti

john.valenti@newsday.com

John Valenti, a Newsday reporter since 1981, has been honored nationally by the Associated Press, Society of the Silurians and National Headliner Awards for investigative, enterprise and breaking news reporting, as well as column writing. He is the author of “Swee'pea,” about New York playground basketball star Lloyd Daniels. His debut crime novel, “For Nothing Is Hidden,” rooted in 1950s Long Island, was released in October 2025.