A man runs over a bridge in Frankfurt, Germany, Wednesday, June 24, 2026. (AP Photo/Michael Probst)

People cool off at the Piscina Romano as a heat wave is predicted across Italy, in Milan, Italy, Wednesday, June 24, 2026. (AP Photo/Luca Bruno)

Tourists with an umbrella take a photo in Paris, as France is enduring a grueling heat wave with temperatures soaring above 40 degrees Celsius (104 Fahrenheit), Monday, June 22, 2026. (AP Photo/Christophe Ena )

A man keeps his legs dry as he cycles through standing water in London, as a heat wave is predicted Tuesday, June 23, 2026. (AP Photo/Kirsty Wigglesworth)

People walk along the Seine river during music day in Paris, Sunday, June 21, 2026. (AP Photo/Michel Euler)

A sign outside a pharmacy displays a temperature of 37 degrees Celsius (98.6 degrees Fahrenheit) in Paris, Sunday, June 21, 2026. (AP Photo/Michel Euler)

People cool off in a water spray at the Eiffel Tower in Paris, Sunday, June 21, 2026. (AP Photo/Michel Euler)

A faithful cools off as they wait for Pope Leo's XIV weekly general audience in St. Peter's Square at The Vatican, Wednesday, June 24, 2026. (AP Photo/Alessandra Tarantino)