Boy Scouts from Smithtown Troop 349 canoeing and kayaking the...

Boy Scouts from Smithtown Troop 349 canoeing and kayaking the Nissequogue River to Short Beach on Saturday morning. Credit: Joseph Sperber

Long Islanders won’t get any reprieve from the stifling humidity as wet and muggy conditions are expected to continue through Monday, forecasters said.

Showers and thunderstorms are in the forecast for early Sunday morning, with a chance for more storms in the afternoon and early evening, according to the National Weather Service.

There is a 60% chance of rain on Sunday with a high of 82. Some of the storms could produce heavy rains.

“It’s going to stay warm and unseasonably humid into next week, I would say through midweek," National Weather Service Meteorologist Jay Engle said Saturday evening.

Monday is also expected to be wet and humid with a 50% chance of precipitation that morning and a high of 81. Clouds will break Tuesday for sunshine but there will be a chance of rain at night.

Meanwhile, forecasters continue to keep their eye on Hurricane Lee, which weakened from a Category 5 storm to a Category 3.  

The hurricane’s path remains unclear but forecasters are certain that dangerous beach conditions are probable around the middle of next week for Long Island. On Aug. 30, Hurricane Franklin caused several beach closures on the South Shore due to flooding and rough surf conditions. 

"Most of the guidance has [Lee] going east of us, where we wouldn’t get direct impact," Engle said, adding that erosion and rip currents are possible as the storm moves up the Atlantic.

As in previous years, this month’s warmer weather is keeping several local beaches open and staffed through mid and late September. A late summer heat wave struck the region earlier this week, and a heat advisory was issued for western Suffolk and Nassau. Excessive heat caused schools in both counties to cancel sports activities on Wednesday and part of Thursday

The average September temperature has risen about 2 degrees at Islip since records were first kept in 1963.

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