Drizzle and light rain are in the picture for the rest of Thursday, with thunderstorms and heavier rain expected for the overnight hours, forecasters say.

Given the cloud cover and east winds, highs Thursday are likely to hover only around the upper 50s, said Carlie Buccola, National Weather Service meteorologist in Upton.

Areas of fog also could develop from afternoon through the nighttime hours, the weather service said.

The weather was causing flight delays at LaGuardia and Kennedy airports, the Port Authority said in alerts Thursday morning. Travelers are advised to check with their airlines about specific flight delays.

A coastal flood warning will be in effect for the South Shore back bays of Nassau County from 7 to 11 p.m., with possible minor to moderate coastal flooding. A coastal flood advisory will be in effect for the South Shore bays of southwestern Suffolk from 8 p.m. to midnight.

A coastal flood advisory also will be in effect from 10 p.m. Thursday through 1 a.m. Friday for the North Shore of Nassau and northwestern Suffolk.

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Unsettled conditions are expected to last through Friday, the weather service said. Showers will taper off through Friday, with highs reaching the upper 60s.

As for the Memorial Day weekend, Saturday and Sunday are forecast to bring partly sunny skies with highs in the lower 70s and upper 60s, respectively.

Then, back to the chance of rain Sunday night through Monday, which could see highs of around 70 degrees.

Still, don’t expect a washout, said Rich Hoffman, News 12 Long Island meteorologist. Monday is forecast to bring mostly cloudy skies with on-and-off showers, dotted with breaks of sunshine.