"We're used to treating hot spells as a chance to go play in the sun," said a top government scientist. "Our lifestyles and our infrastructure are not adapted to what is coming."

Meteorologists said an overheated mass of air and warm African winds are driving temperatures in the Iberian Peninsula beyond their usual highs.

 Created by researchers at the nonprofit Climate Central, the Climate Shift Index teases out the effect of climate change on daily temperatures all over the U.S., showing how the burning of fossil fuels has boosted the odds of any given daily high and low temperatures.

A blanket of hot air stretching from the Mediterranean to the North Sea is bringing much of Western Europe its first heat wave of the summer.

People are flocking to pools, beaches and cooling centers in a swath of the Midwest and South spanning from northern Florida to the Great Lakes, as a heat wave pushed temperatures into the 90s and beyond.

Temperatures will rise into the triple digits across the Southwest and western U.S. this weekend. Daytime temps will be 10 to 20 degrees hotter than normal, according to the National Weather Service.

The Forest Service is also warning that air quality is likely to deteriorate as wildfires continue to burn.

The National Weather Service predicts areas on the East Coast could reach 100 degrees Thursday, with triple-digit temperatures in the Pacific Northwest, too. Relief isn't expected until the weekend.

There's been about two degrees Fahrenheit of warming so far worldwide. That may sound like a small number, but scientists say it's enough to make extreme weather events much more common.

With much of the U.S. already sweltering this summer, even avid runners, hikers and bikers are wilting. We've got 10 strategies from experts on how to enjoy hot weather exercise without keeling over.

A new study finds that for more than 70% of all U.S. counties, urban temperatures are higher in neighborhoods that have low-income people and communities of color.

The United States is in the middle of an unprecedented heat wave. While the West Coast has been feeling the worst of it in the past several days, climate scientists say Georgians shouldn’t relax yet. 

The town of Lytton, British Columbia, caught fire and was completely evacuated Wednesday, just one day after setting a new all-time Canadian heat record with a high of 121 degrees Fahrenheit.

Heat-related illnesses have sent hundreds of people to the ER across the region as temperatures hit unprecedented highs. British Columbia reported about 100 excess deaths from Friday to Monday.

The Pacific Northwest is being scorched. Trapped beneath a heat dome, the effects of extreme heat are being seen in dramatic detail.