The National Weather Service issued the heat advisory for areas along and south of a line from Lancaster to Newberry to McCormick. Forecasters say highs in the mid to upper 90s combined with high humidity will make it feel like 105 to 110 degrees.
There is a chance of afternoon thunderstorms, especially in the Midlands and northern coast.
The hot weather isn't going away any time soon. Forecasters predict highs in the 90s across the state for the next seven days.