The heat index considers the actual temperature and amount of moisture in the air using the dew point or relative humidity.

At 2:08 p.m. on Monday, the National Weather Service released a heat advisory in effect until Tuesday at 9 p.m. for Lauderdale, Colbert, Franklin, Lawrence, Limestone, Madison, Morgan and Cullman counties.

Hot and humid conditions continue for Central Florida on Monday with the region under a heat advisory from noon-6 p.m., according to the National Weather Service.

Heat index values could rise to 110-112 degrees, according to the National Weather Service. Higher rain chances later in the week could offer relief.

The National Weather Service office in Mobile, Alabama, issued a heat advisory in Escambia, Santa Rosa and Okaloosa counties between 10 a.m. and 7 p.m. Monday. Heat index values are forecast to reach as high as 109℉ in portions of south central and southwest Alabama, northwest Florida and southeast Mississippi.

How low should you set your thermostat for as record-breaking heat sweeps over the country? Here's what experts and other Floridians say.

Hot and dry conditions thorugh the first half of this week will bring the first 100-degree day of 2025 to many areas. Temperatures will ease a few degrees as rain and scattered storms return closer to the weekend.