Cindy Andrade of Glen Cove with her sons, Aaron,4, and...

Cindy Andrade of Glen Cove with her sons, Aaron,4, and Jefferson,12, picking pumpkins at Wheatley Farms and Arts Center, Monday, in Brookville on a cool, autumn day. Credit: Debbie Egan-Chin

What a difference a week makes.

Just last Wednesday, temperatures across Long Island were still in summertime mode, with a record-high of 83 degrees recorded at Islip-Long Island MacArthur Airport — breaking the prior high of 82 degrees, set in 2013.

But on Monday, Long Islanders awoke to sub-50-degree temperatures and the high Monday afternoon was just in the low 60s with a slate of similar days forecast to fill out the week.

Tuesday, Wednesday and Thursday will be filled with sunshine but there is a slight chance of showers Monday night and a better chance Thursday night into Friday, according to the National Weather Service. Highs will be in the mid-60s most of the week, slightly lower on Friday. Night lows will be in the low 50s.

Unsettled weather is expected for the weekend in the longterm forecast.

Expect light breezes this week: Monday winds of 7 to 13 mph are expected followed by 5 to 10 mph winds both Tuesday and Wednesday, the weather service said.

A small-craft advisory is in effect for all South Shore ocean waters until Tuesday at 2 a.m. That advisory stretches from Sandy Hook, New Jersey, to Montauk Point. The weather service warned that mariners could see winds up to 30 knots, or 34.5 mph, and seas ranging from 4 to 7 feet.

“Conditions will be hazardous to small craft,” the weather service said in its statement, adding: “Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions."

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