Monday ended both June and the year’s first half on a day that fulfilled the requirements for summer in Washington: ...

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

With a heat wave causing excessive heat warnings in Delaware, you'll hear a lot about the heat index this week. What to know ...

The National Weather Service issued an extreme heat warning for a second day as the heat index surpasses 100. See how hot it ...

Also, keep your pets cool and indoors. If your pet is exposed to extreme heat, the AKC suggests getting your dog to a shady ...

The heat index shows you what the temperature "feels like" to the human body by measuring air temperature and relative humidity (which is the amount of atmospheric moisture present, expressed in a ...

With a heat wave set to continue for several days, NWS Louisville may extend the heat advisory set to expire June 24 at 8 p.m ...

We are well into our first heat wave of the season, and it has been brutally hot. The heat index has been a very important ...

An Air Quality Advisory is in effect across most of Southeast Michigan through Saturday night, including Livingston, ...

The same temperature in New York or Philadelphia this week can feel far more oppressive, partly because of higher humidity — that’s increased water vapor in the air. Here’s how that works.

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.