After warm conditions on Friday, the overnight hours bring around a 30 percent chance for showers on Long Island, make that a slightly higher chance for Saturday, forecasters say.

Because of thunderstorms in some areas, late afternoon flight arrivals at Kennedy Airport were averaging around an hour and a half, with departures also affected, according to the Federal Aviation Administration’s website. LaGuardia arrivals were averaging nearly three hours.

The weather service also said the Department of Environmental Conservation’s air quality alert for Nassau and Suffolk counties remained in effect until 11 p.m. Friday. The alert means Long Island’s Air Quality Index will be higher than 100; levels that high mean different air pollutants can have adverse health effects for those with respiratory issues, including asthma.

The weekend is a mix of sun and clouds with lingering high humidity.

News 12 Long Island meteorologist Rich Hoffman said expect mostly cloudy skies on Saturday with some spotty showers and thunderstorms.

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He said it wouldn’t be a washout but there was the “threat of wet weather at any given point through the day. “

Daily highs are in the 80s.

On Sunday, it clears some, with partly sunny skies and daily highs ranging from 80 to 85 degrees.

There’s also the chance of spotty showers and thunderstorms, Hoffman said.