The sweltering heat blanketing the region has broken yet another record, forecasters said.

Just before 1 p.m., Long Island MacArthur Airport was registering 90 degrees, with a heat index of 92, according to the National Weather Service.

The temperature surpasses the daily record for the day of 88 degrees, which was set in 1988.

It also continues an official heat wave that started Thursday, with the airport seeing highs each day of 90 or above, hitting 97 on Sunday.

A heat wave occurs when there are at least three consecutive days of temperatures that hit 90 degrees or higher.

Still, Monday brings somewhat of a dip from the oppressive humidity levels experienced by most of the Island over the weekend, said News 12 Long Island meteorologist Matt Hammer.

advertisement | advertise on newsday

“It will still be very warm to hot across Long Island today, but the humidity will back off just a touch,” Hammer said.

Heat indexes Monday aren’t expected to go much higher than the actual temperatures, said Tim Morrin, a National Weather Service meteorologist based in Upton.

Long Islanders also should be on the lookout for some precipitation as well, forecasters said.

The weather service indicates about a 50 percent chance Tuesday for showers and thunderstorms for Long Island. Any storms that do come have the potential to bring “damaging wind gusts and torrential downpours,” the weather service said in a hazardous weather outlook issued Monday afternoon.

Temperatures and heat indexes Tuesday were a “tricky” call, according to the weather service.

Two things will be at play, Morrin said — an increase in humidity as winds shift and uncertainty as to the amount of afternoon cloud cover, which could lessen the heat.

As of late Monday morning, he said, Tuesday’s forecast calls for highs in the mid 80s and heat indexes similar to Monday’s, mostly in the lower 90s.