A person cools off at Trocadero fountain near the Eiffel Tower during a heat wave in Paris, Wednesday, June 24, 2026. (AP Photo/Christophe Ena)

A pedestrian tries to keep cool, using a fan to shelter form the sun as she walks over Westminster Bridge, in London, Wednesday, June 24, 2026. (AP Photo/Alastair Grant)

Faithful shelter from the hot sun as Pope Leo's XIV arrives for his weekly general audience in St. Peter's Square at The Vatican, Wednesday, June 24, 2026. (AP Photo/Alessandra Tarantino)

Faithful shelter for the hot sun 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)

A person cools off at Trocadero fountain near the Eiffel Tower during a heat wave in Paris, Wednesday, June 24, 2026. (AP Photo/Christophe Ena)

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 )