Long Islanders can look forward to mostly seasonable weather for much of the week with the chance of some occasional pop-up showers, the National Weather Service said Sunday.

There'll be a mostly sunny start to the day on Sunday with no chance of rain.

"Highs will be in the mid- to upper 60s," said Joe Pollina, a meteorologist with the service in Upton. "At night lows will be in the 40s over the eastern section of Long Island to the lower 50s across Nassau County."

"Today [Sunday] will be around normal but we do warm up to above normal on Monday, Tuesday and Wednesday, then it's back down to normal on Thursday," Pollina said. "Normal for this time of year is 65 for a high at Islip and the normal low is 47."

Dry conditions continue during the day on Monday when highs are predicted in the lower 70s and it will be mostly sunny. Clouds will increase during the afternoon and at night temperatures will dip into the mid- to upper 50s.

"There'll be a slight chance of showers Monday after midnight," Pollina said.

The clouds hang around into Tuesday when highs will again be in the low 70s and there will be a 30 percent chance of showers throughout the day. Lows at night will be in the mid-50s and there will be another chance of showers around midnight.

advertisement | advertise on newsday

Wednesday will be sunny in the morning and highs will be in the mid- to upper 60s. But the clouds return and increase throughout the day, bringing with them a slight chance of afternoon showers. Nighttime lows will be in the upper 40s to lower 50s and the clouds will begin to decrease after 2 a.m. and there's another slight chance of showers Wednesday night into Thursday.

The threat of showers remains throughout the day Thursday when it will be partly sunny with highs in the mid-60s and lows at night will dip into the mid- to upper 40s.

Some morning sun starts the weekend on Friday but there will be more clouds than sun later in the day and there's a slight chance of precipitation for late morning that increases in the afternoon. Lows will be in the mid-40s.