A mostly cloudy week of seasonable weather and possibly rain is ahead for Long Islanders, according to the National Weather Service.

Sunday will be partly cloudy with highs in the upper 60s to lower 70s for most of the island, said Joe Pollina, a spokesman for the National Weather Service in Upton. "It'll be cooler in the Pine Barrens as usual," he said. "At night temperatures will dip into the lower 60s when clouds will increase though it will remain dry."

The workweek will begin with mostly cloudy skies on Monday when highs will reach the upper 70s and clouds will increase throughout the day. "There'll be an increasing chance of rain during the day, with western sections like Nassau County having more of a possibility of rain in the late morning or midafternoon than the eastern sections. Lows will be in the mid to upper 60s, on the warm side for this time of year," Pollina said.

Tuesday's highs will be in the upper 70s with mostly cloudy skies and a continued chance of rain. "There'll be a 25 percent to 40 percent chance of rain during the afternoon on Tuesday," Pollina said. "At night lows will be generally in the lower 60s to mid-60s and there'll be a 50 percent chance of rain throughout the night with diminishing clouds toward daybreak."

Things cool off and the clouds begin to decrease on Wednesday with highs predicted in the lower 70s and lows will be in the 50s. "There'll be a slight chance of rain in the morning," Pollina said. "Wednesday night into Thursday there'll be a chance of a passing storm."

"By Wednesday it'll be slightly cooler than what we would expect for this time of year -- highs are usually about 70." Pollina said.

Highs Thursday will be in the mid-60s when there will be more clouds but some sun. "There'll be a slight chance for showers -- 15 percent to 20 percent -- Thursday morning into the afternoon," Pollina said. On Thursday night into Friday, lows will be in the lower 50s with increasing clouds.

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A slight chance of rain returns Friday for the start of the weekend, with the chance of precipitation from 20 to 25 percent all day. Highs will be in the mid-60s and lows in the lower 50s.