Long Islanders looking for the nicest day for most outdoor activities over the long holiday weekend can put their money on Monday, forecasters say.

That’s when sunny skies are expected, with temperatures heading up to the high 70s.

“By Monday, we’ll have lots of sunshine,” said Rich Hoffman, News 12 Long Island meteorologist.

Saturday kicks off the Labor Day weekend with some mid-to-high-level clouds, which “will gradually lower and thicken through the day with high temperatures struggling to get out of the 60s,” according to the forecast discussion from the National Weather Service’s Upton office.

Areas of Long Island are expected to see highs of around 67 to 69 degrees, 10 degrees or so below normal for this time of year.

Saturday also brings the arrival of precipitation associated with the remnants of Hurricane Harvey, with a small chance for spotty showers to get started around midafternoon, said Melissa DiSpigna, weather service meteorologist in Upton.

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Chances for precipitation are higher for Saturday evening and overnight, she said, when rainfall, moving from southwest to northeast, becomes steadier and widespread, also bringing the potential for a thunderstorm after midnight.

The overnight hours also bring increasing winds, the weather service said, first from the southeast at around 15 to 17 mph, then shifting to come from the southwest.

Chances for rain lessen after noon Sunday, with DiSpigna saying to watch for precipitation to taper off through the afternoon. In all, about half an inch to an inch of rain can be expected.

Temperatures for a breezy Sunday warm up to the mid-70s.