Long Island weather: A warm week before fall arrives but chance of rain Monday

The workweek kicks off with a mix of showers and above average temperatures as conditions cool off toward the latter part of the week to welcome the beginning of fall, according to the National Weather Service.

A 40% chance of showers and thunderstorms after 2 p.m. is forecast for a mostly sunny Monday with a high in the mid 80s. At night, there is a 30% chance of showers and thunderstorms before 2 a.m. with a low at about 61.

As Hurricane Fiona makes its way through Puerto Rico on Sunday, Joe Pollina, a meteorologist with the National Weather Service in Upton, said they will continue to monitor the storm for any potential impacts to the island. 

“We’ll be watching closely the track of Fiona,” Pollina said. “We’re not looking at any direct impacts …, but we could see some indirect impacts such as an increased risk for rip currents as it makes its closest approach to the continental U.S.”

Conditions dry off Tuesday for most parts of Long Island, but scattered showers may make an appearance near the Twin Forks of Long Island, Pollina said. Sunny skies with a high near 82 is forecast for Tuesday. Tuesday night will be mostly clear with a low around 61

Wednesday will be sunny with a high near 82, but at night the forecast includes a 50% chance of showers with mostly cloudy skies and a low around 65. 

Pollina said average high temperatures for this time of the year is in the mid 70s for Islip, while the average low is near 58.

Rain continues into Thursday, the first day of fall, with a 40% chance of showers and partly sunny skies along with a high in the upper 70s. Nighttime will be mostly clear with a low near 53.

Friday will be sunny and breezy with a high near 68, but dropping to the low 50s at night, according to the weather service.

Saturday and Sunday will be sunny with highs in the low to mid 70s.