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Forecast: Sunny, cooler days, and rough surf

Long Islanders can anticipate another sunny late-summer stretch all the way through the weekend into next Thursday, experts said.

However, it will be quite a bit cooler than usual.

"Forecast highs this weekend are only in the low to mid-60s, which is approximately 10 degrees below normal," the National Weather Service in Islip said.

Nighttime temperatures this weekend — and even some frost — will show that autumn is trying to jostle its way in ahead of summer’s official end Tuesday, the weather service said.

Meanwhile, coastal residents this weekend may be coping with some of the hazards of living near the water, including erosion, the weather service said.

Nassau’s South Shore dwellers could experience minor coastal flooding, the weather service warned, issuing an advisory for Friday night through Sunday.

A high-surf advisory will be in effect for Long Island's South Shore Saturday night through Monday. "High surf, beach erosion, and beach flooding will develop Sunday and continue into early next (week)," the weather service said.

Friday’s moderate rip current risk also will continue into next week.

But fall is on its way.

"For the next few nights, some patchy frost is forecast for the most interior locations in the region where winds will be relatively lighter and with lows getting into the mid- to upper 30s," the weather service said.

It's the combination of high tides, a persistent northeast wind flow, and approaching energetic swells from distant Hurricane Teddy that will bring high surf, dangerous rip currents and significant oceanfront impacts Sunday into Monday, the weather service said.

After Monday, when the daytime high should be much like the weekend, hitting 65, temperatures should gradually warm, hitting 69 Tuesday, 74 Wednesday and 76 Thursday, the weather service said.

Happily for Long Island, an upper trough should guide Teddy off what the weather service calls far northern New England from Tuesday to Wednesday.

"This would have no more impact than keep the area under a dry Northwest flow," the weather service said.

As for this leaf season, when trees reveal their crimson, orange and yellow glories, it may only be average this autumn, Cornell University experts said, as warm, dry weather doesn't produce "optimal colors." But sunny days and cool nights "help maximize leave sugar production and keep it locked in the leaf, resulting in the potential for more vibrant colors," said Taryn Bauerle, associate professor of plant science, by email.

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