South Florida is under a heat advisory, with feels-like temperatures exceeding 100 degrees, and hot weather is expected through the week, the National Weather Service said Monday.

The sweltering summer weather persists across South Florida, as forecasters have issued a heat advisory for Saturday in Miami-Dade, Broward and Palm Beach counties. Temperatures are expected to feel as hot as 109 degrees.

All of Florida will be under heat advisories Monday, July 21, as a heat dome spreads from the Ohio and Mississippi valleys. Here's what to know.