During Australia's unprecedented heat wave in late January, air temperatures reached 50°C in inland South Australia.

During a heat wave, much attention is paid to extremely high temperatures during the daytime, but it’s the warm overnight lows that can be really dangerous. Many think they'll get some relief as the ...

Every summer, public health agencies warn about heat waves, and every summer, the death toll still catches communities off ...

The intense heat wave was expected to hit its peak Friday for most of the county, but San Diegans can feel a bit of relief from the heat by a slight cooling over the weekend accompanied by possible ...

Another heat wave is headed for North Carolina and will raise temperatures even into the mountainous regions of the state. The National Weather Service issued a short-range forecast at 4:12 a.m. on ...

Extreme heat can become lethal quickly. A young man cools off at Washington, D.C.'s Yards Park during a heat wave in 2021. Olivier Douliery/AFP via Getty Images For many people, summer is a time for ...

The heat wave will begin for many today, others will hop on board tomorrow. Highs will be in the upper 80s and low 90s this afternoon under blue skies. Overnight, lows will drop into the 40s and 50s.

As the frequency and intensity of heat waves increase across the U.S., a similar but more striking phenomenon is occurring in American rivers. Subscribe to our newsletter for the latest sci-tech news ...

A record-setting marine heat wave stripped huge portions of Florida's coral reef of their colors in 2023, triggering the ninth and worst mass bleaching event in the Caribbean. Temperatures soared for ...

Cold snaps and heat waves have contributed to tens of thousands of deaths in the United States over the past quarter-century, a new study says. More than 69,000 U.S. deaths occurred between 1999 and ...

New England is facing yet another steamy heat wave with dangerously high heat indexes of 95 to 100 degrees starting Monday and lasting through Wednesday. Heat advisories are in effect through ...