People cross 15th Street Northwest as a National Guard Humvee blocks the roadway, Wednesday, July 1, 2026, in Washington. (AP Photo/Tom Brenner)

Children reach for cold bottles of water from U.S. National Park Police Officer R. Douglass as they wait in line for the ferris wheel at the Great American State Fair on the National Mall, Wednesday, July 1, 2026, in Washington. (AP Photo/Jen Golbeck)

Emmanuel Lopez tries to cool off during a run from hot weather at Dodge Fountain at Hart Plaza in Detroit, Tuesday, June 30, 2026. (AP Photo/Paul Sancya)

Visitors use a jacket for shade as they walk at the Great American State Fair on the National Mall, Tuesday, June 30, 2026, in Washington. (AP Photo/Mark Schiefelbein)

A woman stands in mist trying to cool off from hot weather at Dodge Fountain at Hart Plaza in Detroit, Tuesday, June 30, 2026. (AP Photo/Paul Sancya)

FILE - Parisians bath in the Canal Saint-Martin in Paris, as the national weather service, Meteo France, placed 54 departments, about half the country, under a red heat wave alert, on June 23, 2026. (AP Photo/Christophe Ena, File)

Chyane Johnson tries to cool off from hot weather in Dodge Fountain at Hart Plaza in Detroit, Tuesday, June 30, 2026. (AP Photo/Paul Sancya)

People cool off in a fountain during hot weather Monday, June 29, 2026, in Kansas City, Kan. (AP Photo/Charlie Riedel)