Stephanie McCallister holds a cold bottle of water to her husband Don McCallister's neck 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)

Visitors wait to enter the Washington Monument, Wednesday, July 1, 2026, in Washington. (AP Photo/Tom Brenner)

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)

FILE - Petrona Romero, right, drinks an electrolyte beverage while working alongside her husband, Cristino, in a sugarcane field in Niland, Calif., Sept. 11, 2025. (AP Photo/Jae C. Hong, File)

FILE - Grace Chyuwei pours water on Joe Chyuwei to help with the heat Aug. 3, 2025, in Death Valley National Park, Calif. (AP Photo/John Locher, File)

FILE - Workers climb down from a building during a heat advisory, May 19, 2026, in New York. (AP Photo/Adam Gray, File)

FILE - A person uses a fan as they wait in line to purchase Broadway tickets in Times Square, during a heat advisory in New York, May 19, 2026. (AP Photo/Adam Gray, File)