Much of the U.S. is under a blanket of oppressive heat as people prepare for a sweltering July 4th holiday. It’s during times like these that you often hear people talk about the “heat index” when ...

Whether a summer day is great or awful often comes down to the humidity.

Michigan's heat wave this week will feel even warmer because of high humidity. Here's how the heat index works.

Today's extreme heat for the World Cup match between Portugal and Croatia is expected exceed world soccer union guidelines ...

The oppressive air mass will likely linger into Friday, though showers could bring some some relief.

Temperatures are skyrocketing for the third straight day across the Eastern US, but there’s at least three different ways to say how hot it really is.

Cincinnati and the Midwest are experiencing a heat wave with heat index values reaching up to 105 degrees. A heat advisory is ...

An error has occurred. Please try again. With a The Portland Press Herald subscription, you can gift 5 articles each month. It looks like you do not have any active ...

The metric of how hot the air actually feels has roots in a 1979 journal paper called “The Assessment of Sultriness.” By Andy Newman In recent days, you may have seen or heard many mentions of a ...

Exercising outside in high temps can be a health hazard. Here's how to read your local index, according to a doctor, so you can stay safe.

An extreme heat watch has been issued for Mount Desert Island and surrounding areas. Dangerously hot conditions are expected ...