Friday’s record-breaking temperature at 89 degrees swiftly decreased overnight into Saturday morning thanks to a “weak upper level disturbance” bringing along scattered showers, the National Weather Service said.

Nassau and western Suffolk counties were greeted by scattered rain showers Saturday around 7 a.m. Saturday’s forecast includes mostly cloudy conditions with a chance of a brief shower across Long Island through 1 p.m., said Tim Morrin, a meteorologist with the weather service’s Upton bureau.

“Not all neighborhoods will see the shower,” Morrin said. “It will be light and quick but unfortunately the sun is going to be delayed until later in the afternoon due to this disturbance.”

Morrin said rainfall totals would be negligible, “hardly even wetting the ground.” No precipitation is expected Saturday night or Sunday, he said.

Meanwhile, temperatures will be “dramatically lower than the last two days,” Morrin said, with the mercury only reaching the lower to mid-60s on Saturday.

Matt Hammer, a meteorologist with News 12 Long Island, said the cooler weather on deck this weekend means it’s “so long, summer, for now.”

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“Our cloudy skies will begin to break for some sunshine later this afternoon and into early this evening,” Hammer said. “Highs today will be around the mid-60s after we got to enjoy the really hot weather of the past few days.”

Temperatures reached 89 degrees both Thursday and Friday at Long Island MacArthur Airport in Ronkonkoma, Morrin said. Thursday’s heat tied the record temperature on that day from 1977, while the previous record for Friday’s date of 87, which was set in 1998, was broken, Morrin said.

Those temperatures were “a full 20 degrees above normal” for this time of year, when temperatures at MacArthur are typically in the upper 60s to right around the 70-degree mark, Morrin said.

“The better day of the weekend regarding sunshine is Sunday with mostly sunny and temperatures in the mid-60s,” Morrin said. “Despite the sunshine, it’ll be a little cooler than average but the sun will make us feel warmer.”

While beachgoers flocked to the ocean beaches Friday to soak up the sun, the water temperatures remain in the “hypothermic” zone, Morrin said.

South of the Fire Island inlet, water temperatures were at 56 degrees Saturday morning; 60 degrees in the Great South Bay; 55 degrees southwest of Montauk Point; 56 degrees in the central Long Island Sound; and 60 degrees in the western section of the Long Island Sound, Morrin said.

“These temperatures are way below swimmable,” Morrin said. “Because the water is so deep, it takes a lot more energy to warm up.”

Typically, Long Islanders will have to wait until at least mid-June for the water to warm up to the mid-60s “before you even begin to think about tolerable,” Morrin said.

Some years, waters off the coast of Long Island weren’t warmed up until the Fourth of July, he said.

Showers and storms return on Monday with temperatures in the mid-60s, Hammer said. Tuesday “looks really nice” with highs around 70 and a mix of sun and clouds, he said. “Unsettled weather” creeps back in for Wednesday, Thursday and potentially part of Friday with chances of scattered rain showers and highs in the upper 60s to low 70s.

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Giving an early look at Memorial Day Weekend, Hammer said that “Saturday looks nice with sun and a few clouds and highs in the 70s.”