As a heat wave hits multiple U.S. states, some areas are have been placed under extreme heat watches and warnings.

Most of Long Island is under an extreme heat warning Tuesday as temperatures are expected to reach dangerous heat index ...

Cook County and Chicago are under an Extreme Heat Warning starting Saturday morning, a Heat Advisory has been issued for the ...

Tuesday could bring a higher heat index, with real-feel temperatures up to 111 degrees. Here's when the region could see ...

In case you've lost count, today is going to be the third 90-degree day in a row for Pittsburgh. The extreme heat will be in place through the weekend. Now, our highs will likely dip closer to 90 ...

The dangerous heat index values and extreme humidity continues into the upcoming weekend. Warmer than normal conditions expected though the 4th of July.

With New York under an extreme heat warning, the Mets took extra precautions Monday. Those included a later report time for ...

Central Park last had a 100-degree day on July 18, 2012, and hasn’t seen a triple-digit temperature in June since 1952.