The kickoff Thursday to astronomical fall may be bringing continuing warmer-than-normal weather, but get ready for a brief shot of autumn cool later in the weekend, forecasters say.

Already on Wednesday the temperature at Long Island MacArthur Airport had tied the daily record of 82 degrees, set in 1989, the National Weather Service said in a 4:41 p.m. tweet.

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And those warm conditions are expected through Friday, said Rich Hoffman, News 12 Long Island meteorologist.

Thursday could reach the low 80s, about 10 degrees above normal, and it will be slightly warmer on Friday, said Jay Engle, weather service meteorologist based in Upton.

But, along with the arrival of a high pressure area from southeast Canada comes about a 10 degree dip to the more seasonable lower 70s for Saturday, the weather service said.

By Sunday and Monday, we’re looking at possible highs — and prepare yourself for this — only in the upper 60s, Engle said.