Germany, meanwhile, is expecting potentially record-breaking temperatures on Tuesday, as 10 of Germany's 16 states raised their forest fire alarm to its highest level.
In Britain, temperatures have reached 40 degrees Celsius for the first time on record, with 40.2 degrees provisionally recorded at London's Heathrow Airport, the Met Office said on Tuesday, according to PA Media.
People living in the Netherlands might get a break on Wednesday, as the weather service expects maximum temperatures of up to 30 degrees Celsius, but also heavy thunderstorms.
In Belgium, the capacity of the Doel 1 and Doel 2 nuclear reactors has been reduced owing to the heat. There are fears that the cooling water will become too warm, the Belga news agency reported, citing operators Engie.
On Tuesday, the country recorded 36.4 degrees Celsius, its fourth highest temperature since records have been kept, the KMI weather service said.
Several cars burst into flames on the Belgian coast. Five cars burnt out and five others were damaged in the dunes of the seaside resort of De Haan on Tuesday, the Belga news agency reported, citing police sources. Heat and dryness had led to a rapid spread of the fire.
However, the fire brigade had brought the blaze under control and was trying to prevent it from reigniting. VRT reported that the fire may have started in a parked car or from a discarded cigarette.
