Long Islanders may look to beat the heat over the next three days as temperatures in some areas are expected to climb into the upper 80s and lower 90s over much of the region starting Sunday.

John Murray, a meteorologist with the National Weather Service in Upton, said temperatures for most of Long Island on Sunday will be in the mid-80s to lower 90s with the mid-80s forecast for the southern half of Nassau and Suffolk counties, but lower 90s further inland away from the ocean. Temperatures on the Twin Forks in eastern Suffolk are expected to be a bit cooler, he said, about 80 degrees.

“The main story is going to be the increasing heat and humidity,” Murray said.

News 12 Long Island meteorologist Matt Hammer said an air quality alert has been declared for the Island from 10 a.m. to 10 p.m., which means that those who have respiratory issues should limit strenuous activity in the heat. Hammer also said today’s UV Index will be a nine — which means sunburn is likely on unprotected skin after about 20 minutes in the sun.

“For Long Island, today we start a period of three days of hot and humid weather,” Hammer said.

Temperatures on Sunday night are expected to be the coolest on the Twin Forks, with lows in the 60s, but expect upper 60s to near 70 for much of the Island, forecasters said.

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Monday expects to look much like Sunday, forecasters said, with temperatures possibly a degree or two warmer for much of the Island and cooler in the low to mid-80s on the Twin Forks.

Tuesday looks to be hot as well with relief coming Wednesday, Hammer said, when temperatures will be in the low to mid-70s. Showers are likely Tuesday night as cooler air moves over the Island, Murray said.

The rest of the week looks dry with a chance for showers Friday into the weekend, Hammer said.