Early risers on Long Island could think they’re in for another sunny, pleasant day of the weekend but conditions will change later in the morning to start off another week of largely unsettled weather.

“Things are going to be changing significantly,” News 12 meteorologist Mike Rizzo said of Sunday. He said that in comparison to Saturday’s sunshine and blue skies, “We’re going to see something different, more of a cloudy situation. We’ll wake up with sunshine but then the clouds quickly increase as we head into late morning.”

Rizzo said the average high for this time of year is 70 degrees and that’s where the mercury will reach for Islip and Hempstead but the high will be a warmer 71 in Stony Brook and 73 in Huntington. He said it will be cooler in Rocky Point, Jamesport and Babylon which will see a high of 69 while Westhampton will get to only 68 and Fire Island a much cooler 61.

Expect showers to start after 3 p.m. with possible thunderstorms in the evening and a low of 60 overnight, Rizzo said. He said the rain should be “on and off throughout much of the evening into Monday.”

Monday will be “dreary with periods of rain once again,” Rizzo said. The expected high is 69 and the low 55. He said the precipitation “will be spotty in nature through Monday” and added, “I don’t think we’ll see a glimpse of sun.”

Tuesday will be cooler with the temperature reaching only to 60 for the high and the low dipping to 52. And get ready for the wet weather to hang around through the middle of the week, Rizzo added.

Rizzo said there will be “unsettled weather through Monday, Tuesday and Wednesday.” A high of 63 is ahead for Wednesday and a low of 51.

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David Stark, a meteorologist with the National Weather Service’s Upton bureau, said the normal high is 74 and the normal low 57.

Stark said the cooler weather ahead is due to the winds coming off the ocean.

“The ocean temperature is still in the 50s to lower 60s,” Stark said, so that keeps things cool along when there’s little or no sun.

The weather picture brightens up again for Thursday and Friday when the sun makes a comeback and there are fewer clouds and more seasonable temperatures.

On Thursday, a high of 64 and low of 53 is forecast and for Friday a high of 69 and low of 60.