After a couple of days of deep winter cold, Monday has seen temperatures rise to 40 degrees or more — opening the door to highs in the 50s for Tuesday and Wednesday, forecasters say.

Then, on Thursday and Friday, it’s back to the 40s.

“Up and down temperatures this week,” said News 12 Long Island meteorologist Rich Hoffman, pointing even to the chance of snow Friday morning.

As of mid-afternoon Monday, Farmingdale, Shirley and Long Island MacArthur Airport had reached at least 40 degrees, according to the National Weather Service.

The day has brought “mostly sunny skies, giving way to late-day clouds,” Hoffman said.

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The overnight hours go on to see the chance of showers, with temperatures dipping to lows around the mid-30s, then rising to close to 40 degrees not long after sunrise Tuesday, according to his forecast.

“The first chance of rain will be [Monday night] as a warm front approaches and moves through from the southwest,” the weather service said in its regional summary. “Chances for rain will increase into Tuesday and Wednesday, with temperatures warming each day.”

The high for the day Tuesday is expected to be in the low 50s, he said. Wednesday will be “mild,” said Hoffman, with “morning clouds and showers giving way to sunshine” and highs near 57 degrees.