Showers, some potentially heavy, are in the Long Island forecast Thursday night into the overnight hours, according to the National Weather Service.
An area of low pressure riding along a warm front brings the potential for heavy downpours and thunderstorms from about 8 p.m. until about 4 a.m., weather service meteorologist Peter Wichrowski said.
He added that forecasters are "not expecting severe weather."
News 12 Long Island meteorologist Samantha Augeri said humidity levels and temperatures Thursday should drop slightly from those earlier in the week.
"It's a back-and-forth weather day," Augeri said.
In a special weather statement, the weather service said some of the storms could produce heavy rain and flash flooding.
Chance of precipitation during the day Thursday is 20 percent, climbing to 70 percent for early Friday morning, with new rainfall amounts between one-quarter and one-half inch possible.
Augeri said the storms will clear out by Friday morning, "with a nice, dry summer stretch through the weekend."
Highs Thursday near 80 degrees are expected, with light northeast winds. Overnight lows are in the mid to upper 60s with the rain and light morning fog giving way to a mostly sunny Friday.
Augeri said most of Friday should be "comfortably warm with lower humidity."
Conditions for Friday include daily highs in the low 80s with north winds less than 10 mph shifting to the west southwest, she said.