Extreme heat makes it especially hard for your body to cool down, so you need to be extra careful if you exercise or play ...

Sweltering heat happens every summer, but to get close to the bar of a state's all-time hottest temperature usually takes a heat wave that's on another level.

Within those constraints, finding ways to stay hydrated and lower your body temperature are paramount. You can do this by ...

With summer underway across the northern hemisphere - and temperatures in many places reaching new highs - scientists are ...

Summer is just getting started, and millions of people are under heat advisories as a major heat wave spreads across the ...

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

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

Weather experts explain the science behind "feels like" temperatures as the region experiences dangerous heat conditions ...

It's because of something called the heat index. The heat index measures what the air temperature combined with the level of humidity feels like to the human body, the National Weather Service says.