Record-smashing daytime temperatures near 100 degrees are expected for millions from the Plains to the East Coast this week, ...

More than 150 million Americans are under the highest-level extreme heat alerts during a wave of above-average temperatures.

St. Louis, Chicago and Des Moines were among the cities that saw heat indexes hit triple digits on Saturday, with the East ...

The city's outdoor pools opened for the summer on Saturday, coinciding with the year's first major heat wave. Eager residents ...

Chicagoans can expect intense heat compounded by muggy humidity for the next several days. The National Weather Service has ...

A large dome of high pressure anchored over the eastern half of the country is bringing sweltering heat and strong winds to ...

Record-breaking heat indices — a combination of temperatures and humidity to determine how heat really feels to the body — ...

The head index is expected to reach around 105 and an extreme heat warning is in effect until Monday, according to the ...

A Midwest heat dome is driving high temperatures and high humidity that will push the Chicago heat index into the triple ...

A heat wave is moving in, with over 100 million people from the Midwest to the Northeast on alert for life-threatening heat ...

The National Weather Service has issued an Extreme Heat Watch for Cook County starting Saturday morning and lasting into next ...

Scorching temperatures and high humidity are a bad combo, especially when that's the forecast for three days in a row, making ...