Summer is here, and heat and humidity have arrived.

Temperatures are skyrocketing for the third straight day across the Eastern US, but there’s at least three different ways to say how hot it really is.

Thursday was the peak of this brutal heat wave, with heat index values topping 110 degrees in several Connecticut towns.

Much of the U.S. is under a blanket of oppressive heat as people prepare for a sweltering July 4th holiday. It’s during times like these that you often hear people talk about the “heat index” when ...

COLUMBUS, Ohio — A major heat wave is expected to grip much of the United States, including Ohio, over the next week. High ...

Heat can be dangerous, but health experts say there are ways to manage the threat. Scorching temperatures, especially ...

Current heatwave is very moist, making it feel worse – especially at night – than all-time high of 40.3C in July 2022 ...

The technical discussion from the Channel 3 First Alert Weather Team.

Humidity is part of the answer. But Britain’s housing, long summer days, and lack of experience with extreme heat also make ...

Paris and other European cities are seeing temperatures above 40C (104F), levels normally seen across the Middle East.

Heat index is the combination of humidity and air temperature. It's a metric that measures how hot it feels.