Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

A brutal heat wave across the eastern United States trapped millions of people in sweltering air this week with record-high ...

Several states are expecting extreme heat, with the heat index, or feels-like temperature, surging past 100 degrees.

Maps show where extreme humidity and 90- or 100-degree temperatures will affect about 255 million people across the United ...

Temperatures in Florida, Georgia, Arkansas, Tennessee, Kentucky, Indiana, Illinois, North Carolina, and Virginia could feel ...

In Caribou, Maine, the National Weather Service issued its first-ever excessive heat warning for a heat index nearing 110F on June 19. Las Vegas also grappled with extreme heat, reaching ...