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)

People cool their feet in the fountain at the WWII Memorial, Tuesday, June 30, 2026, in Washington. (AP Photo/Alex Brandon)

Visitors walk past the Lincoln Memorial Reflecting Pool, Tuesday, June 30, 2026, in Washington. (AP Photo/Rahmat Gul)