Tourists use handheld fans as they pause in Piazza del Campidoglio on Rome's Capitoline Hill, Saturday, Aug. 1, 2026. (AP Photo/Alessandra Tarantino)

Visitors holding umbrellas to avoid sunshine leave the Gyeongbok Palace in Seoul, South Korea, Wednesday, Aug. 5, 2026. (AP Photo/Ahn Young-joon)

The outdoor fitness equipments are empty due to the heat in Goyang, South Korea, Wednesday, Aug. 5, 2026. (AP Photo/Lee Jin-man)

People sit in the shade to avoid the heat in Goyang, South Korea, Wednesday, Aug. 5, 2026. (AP Photo/Lee Jin-man)

Visitors hold umbrellas to avoid sunshine at the Gyeongbok Palace in Seoul, South Korea, Wednesday, Aug. 5, 2026. (AP Photo/Ahn Young-joon)

A firefighter rests from battling wildfires, in the Lège-Cap-Ferret region, western France, Thursday, July 23, 2026. (AP Photo/Caroline Blumberg)

FILE - Meghana Jalagam uses a fan to keep cool from the hot weather during a World Cup soccer match between the United States and Bosnia and Herzegovina at a watch party July 1, 2026, in Detroit. (AP Photo/Paul Sancya, File)

A man carries wood along an area that is usually submerged in water from the Danube River, amid low water levels in Rasova, Romania, Monday, Aug. 3 2026. (AP Photo/Andreea Alexandru)