Another round of sweltering heat is in store for much of the U.S. this week.
Person dies in ‘severe flash flood’ on Joint Base San Antonio-LacklandFLOOD RISK THIS WEEK: Rounds of heavy rain expected tonight through Thursday morningLocal News | San Antonio, Bexar County, Local Headlines | KSATA woman sits in the shade to avoid the heat Monday, July 13, 2026, in Detroit.
The sun beams down on a lifeguard while she watches over a beach at Lake Harriet during an extreme heat warning, Monday, July 13, 2026, in Minneapolis. Simone Mosley waits for their rideshare in shade at a bus stop during an extreme heat warning Monday, July 13, 2026, in Minneapolis.
A work crew resurfaces the wading pool at Bryant Square Park during an extreme heat warning Monday, July 13, 2026, in Minneapolis. A motorist gestures while driving on West Lake Street during an extreme heat warning Monday, July 13, 2026, in Minneapolis. Health experts say overnight temperatures that fail to cool down are even more dangerous than daytime temperatures that soar.
Temperatures were not forecast to drop below 80 F at night in Fort Lauderdale, Florida; Miami; Tampa, Florida; Galveston, Texas; and Charleston, South Carolina, the National Weather Service said. Over the next few days, places in the Midwest and Northeast known for frigid winters will see nighttime temperatures remain above 70 F , including Fargo, North Dakota; International Falls, Minnesota; and Portland, Maine.
Health experts say that high overnight temperatures are particularly dangerous because there's no time for the body's core temperature to cool down and recover from daytime heat.
“That’s where the health outcomes are amplified, particularly for the elderly and vulnerable communities,” said University of Georgia meteorology professor Marshall Shepherd. Just a few degrees of increased body temperature can lead to heatstroke or put too much strain on the heart. If temperatures at night don't cool down your body, the health risks more often show up the next day, said Kristie Ebi, a public health and climate scientist at the University of Washington.
Being proactive is crucial during a heat wave Early warning signs include heavy sweating, muscle cramps and headache.
“It’s hard to know you’re getting in trouble with the heat. This is why we need to be more proactive," Ebi said. It's important to find a way to cool off, whether stepping into air conditioning or wrapping a cold towel around your neck. And health experts say don't forget to check in on friends and family members, especially those who are older, pregnant or who have health challenges that might make it more difficult to handle the heat.
Stop by a library or a mall. Sit in front of a fan and spray water on your skin. Put your feet in cold water. Soak your clothes in water.
And of course, drink plenty of water. Copyright 2026 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.
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