Children play in the water of a fountain to cool themselves in a square in Debrecen, 221 kms east of Budapest, Hungary, Tuesday, July 31, 2018, as the highest daytime temperature may reach 34 centigrades in most parts of the country, and the highest degree heat alert has been issued by the Hungarian health authority. (Zsolt Czegledi/MTI, via AP)

A toasted sunflower is pictured on a field in Dortmund, Germany, July 30, 2018 as the daytime temperatures reach arround 35 degrees Celsius (95 degrees Fahrenheit) in most parts of Germany. (Ina Fassbender/dpa via AP)

People sunbathe on a beach in Barcelona, Spain, Wednesday, Aug. 1, 2018. Spain and Portugal are on track to smash existing weather records this weekend as temperatures rock into the high 40s, as the heatwave across Europe continues. (AP Photo/Manu Fernandez)

The outside air temperature is indicated on the facade of a pharmacy at 42 degrees Celsius (107,6 Fahrenheit), in the Downtown of Marseille, southern France, Thursday, Aug. 2, 2018. The hot weather is expected to last for several days across the country. (AP Photo/Claude Paris)

A woman refreshes at a fountain in Milan, Italy, Thursday, Aug. 2, 2018. Hot air from Africa is bringing a new heatwave to Europe, prompting health warnings about Sahara Desert dust and exceptionally high temperatures that are forecast to peak at 47 degrees Celsius (116.6 Fahrenheit) in some southern areas. (AP Photo/Antonio Calanni)

People sunbathe enjoying warm weather on a lake near Vilnius, Lithuania, Thursday, Aug. 2, 2018. Hot weather has set in with temperatures rising up to 32 Celsius (89,6 Fahrenheit) in Vilnius (AP Photo/Mindaugas Kulbis)