With the heat index reaching temperatures of 108 degrees this week, many people will be spending more time indoors.

The National Weather Service has issued extreme heat warnings and heat advisories for large swathes of the South, Midwest and Northeast.

More than 125 million Americans are under the highest level of extreme heat alerts during a wave of above-average ...

The best wildflower hiking trails in the U.S. Spring is in bloom. Here are our favorite places to frolic through fields of flowers, from the Pacific Northwest to the Appalachian Mountains.

The heat wave caused disruptions to public transport across the Northeast. Amtrak said it will be forced to slow train speeds ...

Those triple-digit air temperatures — with the feels-like index even worse because of humidity — are possible in places where ...