At least nine states along the East Coast faced summer swelter on Monday, and the steamy weather is expected to persist on ...

Some parts of Western Europe were starting to cool off as the extreme heat that has gripped the continent moved east.

Illnesses caused by heat—dehydration, cramps, and even strokes—can come on quickly and quietly. New, wearable technology could help alert wearers to lurking danger.

Soaring temperatures this week has cut power for thousands around Ohio. These maps can tell you how widespread an outage is and when power will return.

Heat indexes are expected to remain above 100 for the next few days throughout Illinois. Find out when it will cool off.

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Stay safe in this sweltering heat, New Jersey. Here's the latest today, from heat maps, advisories and warnings, to when we'll see relief.