Long Islanders will wake up to a bright and sunny day on Sunday. But there will be increasing clouds moving in throughout the day and a chance of rain and thunderstorms on and off during the week, according to the National Weather Service.

Highs Sunday will be in the low 80s, and then temperatures will dip to the mid-60s at night and the low 60s in the east.

"There's a chance of thunderstorms about 3 or 4 a.m. [Monday] that could be heavy and last into the morning commute" said Jay Engle, a meteorologist with the National Weather Service at Upton. "We're probably looking at an inch with ponding on the roadways."

Samantha Augeri, a News 12 Long Island meteorologist, suggested motorists give themselves extra commuting time Monday morning since delays are expected on soggy roadways.

"The commute tomorrow [Monday] could be slower and there could be localized flooding," Augeri said. "There's a warm front bringing us a chance of showers and thunderstorms [during the week] but it's nothing out of the ordinary.

"Most of the rain will be during the first half of the day, then there'll be another batch late in the day or early evening," Engle said. It will be foggy day with highs only in the low 70s due to cloud cover. Lows will be in the mid-60s.

Tuesday will see temperatures in the mid-70s on the east end and in the low 80s on the rest of the island. The chance of showers and thunderstorms comes in the afternoon and lows will be in the mid-60s.

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"On Wednesday we're back to sunshine," Engle said. Highs will be in the upper 70s to around 80 and lows will be in the mid-60s.

There's a 50 percent chance of showers and thunderstorms late Wednesday night into Thursday, the service said.

Highs in most spots will be in the upper 70s Thursday with lows will be in the mid-60s,

There's a bright outlook again on Friday when skies will be partly sunny, highs will be in the upper 70s and lows will be in the mid-60s.