Long Island’s weather this week will be so changeable that one forecaster called it “a bit of two seasons.”

Along with Tuesday’s rain come temperatures in the mid to upper 40s. But instead of dipping down overnight, they are forecast to keep on rising.

That means “warmer, spring-like weather Wednesday, with highs well up in the 50s,” said Bill Korbel News 12 Long Island meteorologist.

It’s possible that a daily record high could be challenged, the weather service said – that’s 59 degrees, set in 2009 at Long Island MacArthur Airport.

Then, “winter will return with much colder temperatures,” Korbel said, bringing “a good chance of accumulating snow Thursday morning.”

That’s as temperatures start descending late Wednesday afternoon, down to an overnight low in the low 30s, and rising just a few degrees during the day Thursday.

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That will coincide with a storm system developing just to the south and east, said Jay Engle of the National Weather Service, with accumulating snow possible for the Thursday morning commute.

Precipitation was expected most likely to start as rain, he said as of yesterday afternoon, but change over to snow fairly quickly.

Latest models say four to six inches could be the most likely but the weather service expects a more precise update early Tuesday.

Variability as to the storm’s speed and changeover time to snow was leading to a wide spread in snowfall amounts predicted, Engle said.