Labor Day will be balmy, sunny and breezy, meteorologists said.

“It’s a great beach day and just a great day to do anything outdoors,” News 12 Long Island meteorologist Matt Hammer said in an email. Long Islanders who are barbecuing should weigh down their napkins with winds of 10 to 20 miles per hour, and boaters should anticipate ocean waves three to four feet high, with a small craft advisory in place through Tuesday evening.

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Highs Monday will be in the mid to upper 70s with ocean temperatures in the high 60s or low 70s. Monday night will be clear but muggy, he said.

The good weather should last until late Tuesday afternoon or early evening, said Faye Morrone, a meteorologist with the Weather Service’s Upton office. Clouds, showers and thunderstorms could interfere with the evening commute, she said.

Tuesday will be unseasonably warm, with highs in the 80s, above the seasonal average of 77. Intermittent showers will continue Wednesday and Thursday, with temperatures dropping into the 70s.

“We should dry out” Friday, Morrone said. “Maybe a shower or thunderstorm here or there, but we’ll be drier than the previous two days.”

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Expect next weekend to be dry, with temperatures in the low 70s, she said.