A heat wave is a prolonged period of abnormally hot weather, often accompanied by high humidity. But here’s the kicker: it has to last at least two or more days, sometimes longer depending on where ...

It's still officially wintertime in Buenos Aires, but the city is in a record heat wave. Tuesday's high was 34.4 degrees Celsius (94 degrees Fahrenheit), the hottest temperature recorded in September ...

OK. One of the times I went running this week in our nation's capital, it was early in the morning but already 82 degrees and 82% humidity. Washington, D.C., has had daytime temperatures over 100 this ...

Forecasters predict the worst of a record-setting heat wave may soon be over — but millions still need to take precautions to stay safe from dangerous heat. The most significant heat conditions are ...