Long Island will get an early soaking Sunday before drying out for the week ahead, A system moving in overnight into Sunday — with temperatures dropping to the low-to-mid 60s — will bring a chance of rain starting at 2 a.m., increasing around 8 a.m.

“All told, tomorrow, as the rain extends potentially overnight into Monday, we’re looking at little over an inch on average,” said Faye Barthold, a meteorologist with the National Weather Service’s Upton bureau.

Possibilities of a thunderstorm on Sunday start around noon, Barthold said, with the rain likely to cease about 2 a.m. to 3 a.m. Monday.

The National Weather Service issued a hazardous weather outlook that could bring between 1 inch to 1 1/2 inches of rain per hour on Long Island and New York City.

The weather service cautioned that rain could lead to flash floods in poor drainage areas.

advertisement | advertise on newsday

Any thunderstorm could bring heavy rain, strong winds and small hail, said Matt Hammer, a meteorologist with News 12 Long Island.

“The bigger focus comes during tomorrow afternoon and evening when we’ll see an increasing chance for a few gusty thunderstorms,” Hammer said.

Normal temperatures for this time of year is about 72 to 73 degrees, Barthold said. The beginning of the week, starting Monday, begins partly sunny weather with highs near 80, Hammer said.

advertisement | advertise on newsday

A cold front expected to arrive Sunday evening will drop temperatures into the 60s and low 70s to start the week with mostly dry conditions forecast until next weekend.