Friday should be mostly sunny on Long Island, with temperatures in the mid 80s and mild winds, forecasters said.

Showers and thunderstorms are also possible, mostly before 10 a.m., the National Weather service said.

A flood advisory was issued for Nassau County through about 9:30 a.m., the service said. Just after 7:30 a.m., the service said that “Doppler radar indicated heavy rain due to thunderstorms. This will cause minor flooding in the advisory area.”

“We’ll have a classic summer day, but also humid conditions,” News 12 Long Island meteorologist Bruce Avery said.

There was heavy rain across northern portions of Brooklyn and Queens later Friday morning, and the weather service issued a flash flood warning for most of New York City until 10:30 a.m.

There is a chance of showers and thunderstorms overnight into Saturday morning on Long Island, and some storms could produce heavy rain, according to the weather service.

After any rain clears out Saturday, it will become cloudy and then sunny with temperatures again in the mid 80s, the weather service said.

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Skies will be sunny Sunday with a high in the high 70s.

The weekend will be “not perfect, but OK,” Avery said. Sunday, he said, will be “lovely with lots of sun and lower humidity.”

Showers are likely Monday and Tuesday as the workweek resumes, the weather service said.