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)

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

Children play at a water sprayground in Des Moines, Iowa, Monday, June 29, 2026. (AP Photo/Hannah Fingerhut)

Toni Kreutzer gives her 13-year-old dog Chester a drink of water during a break in a walk as temperatures approach 90 degrees on Monday, June 29, 2026, in Madison, Wis. (AP Photo/Scott Bauer)

Children play at a water sprayground in Des Moines, Iowa, Monday, June 29, 2026. (AP Photo/Hannah Fingerhut)

A jogger runs on the street during a hot weather day in Mount Prospect, Ill., Monday, June 29, 2026. (AP Photo/Nam Y. Huh)

Children play at a water sprayground in Des Moines, Iowa, Monday, June 29, 2026. (AP Photo/Hannah Fingerhut)