Thursday brings partly sunny skies with “unseasonably high temperatures,” according to the National Weather Service.

For Long Island that means highs mostly in the mid-80s — a bit cooler on the East End — but feeling more like the upper 80s, close to 90, because of the humidity, the service said.

“Temperatures are above normal going into the weekend — warm/hot and a little humid,” News 12 Long Island meteorologist Rich Hoffman said.

Indeed, a heat advisory has been issued for New York City from noon Thursday through 7 p.m. Friday, the weather service said. Such an advisory is called for when heat combined with humidity is likely to make it feel like at least 95 degrees for two days in a row, bringing increased risk for related health issues.

Beachgoers Thursday should know there’s a moderate risk for rip currents at Long Island’s ocean beaches.

The overnight hours bring a chance of showers and thunderstorms.

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Friday could see Long Island temperatures of right around 90, feeling more like mid-90s with the humidity.

The day is expected to be partly sunny, hot and humid, Hoffman said, with the chance of a pop-up shower or thunderstorm.

While any possible thunderstorms Thursday night or Friday could bring “locally heavy downpours,” a look ahead shows “no widespread significant rainfall expected through early next week,” the weather service said.

That’s of no benefit to the area’s continuing dry conditions, with Long Island remaining in moderate drought — make that severe for central Suffolk — according to the Thursday update from the U.S. Drought Monitor.

September, so far, was recording slightly above average precipitation for the first seven days of the month — a total of 1.03 inches, which is 0.19 above normal for that time frame, according to the National Weather Service.

Post-tropical storm Hermine made a contribution, with 0.59 of an inch falling Tuesday at Long Island MacArthur Airport.

For what’s known as meteorological summer, which runs from June through August, the airport came in at 6.43 inches below normal precipitation, the weather service said.