Longer-lasting hot spells and high temperatures at night are making it harder to cope, leading to thousands more deaths from ...

The U.S. is looking at an unwelcome birthday gift: a dangerous heat wave arriving ahead of the holiday weekend. Limited time: ...

Exercising outside in high temps can be a health hazard. Here's how to read your local index, according to a doctor, so you can stay safe.

Add Yahoo as a preferred source to see more of our stories on Google. If you thought the worst of the summer's sweltering temperatures were behind us, think again. Some schools closed early as the ...

Michigan's heat wave this week will feel even warmer because of high humidity. Here's how the heat index works.

If you thought the worst of the summer's sweltering temperatures were behind us, think again. Some schools closed early as the late-August heat wave gripping Ohio brought temperatures not seen in ...