Long Islanders will wake up to a dreary, overcast day on Sunday, but things will improve by afternoon as morning showers give way to sunshine and temperatures warm to a high of 80 degrees.

“There’ll be an improving trend with slow, steady improvement today, when there’ll be low clouds, patchy drizzle and warm and humid conditions,” said Tim Morrin, a meteorologist with the National Weather Service office in Upton.

Sunday night will be cool, with a low of 66 and comfortable humidity.

“There’ll be lower humidity,” said Bruce Avery, meteorologist with News 12 Long Island. “It will be hazy, hot and humid as we get more into the week.”

Partly sunny skies will start the workweek on Monday, when highs will reach near 80 and lows will be near 67.

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“The low 80s is pretty much where this time of year should be,” Morrin said.

Mostly sunny skies are ahead for Tuesday, when highs will be near 83 and lows near 69.

A mix of sun and clouds is predicted for Wednesday, when highs will be near 85 and lows near 72.

Mostly cloudy, warm and humid temperatures are forecast for Thursday, when highs will be near 87 and lows near 74.

Mostly sunny skies will begin the weekend, but there is a chance of thunderstorms. Highs near 89 are expected, with lows near 69.