Most of America's Lower 48 states are about to swelter under an unusually large, strong and long-lasting heat dome.
A man died of heat exposure in California's Death Valley National Park, marking the park's second heat death this summer, according to the National Park Service.
A 6-month-old boy died after he was left in a hot car for about seven hours, authorities said.
If you can't get to a pool or don't want to get wet, cooling centers are open across the city.
When it comes to preventative measures and staying hydrated, Dr. Liz Weinandy said, "the best way to avoid dehydration is to drink before you get thirsty."
A prolonged heat wave is hitting the Midwest and Northeast this week in what could be the hottest stretch of weather for some people in 30 years.