As Europe is facing an unusually early and intense heatwave coming from North Africa, governments of many countries have issued warnings and instructions to the public on how to "survive" it.
In France, monthly heat records were recorded in several cities, Xinhua news agency quoted local media as saying.
According to French daily Le Figaro, an absolute record for the seaside city of Biarritz was recorded at 42.4 degrees Celsius, with an average of 35 degree in other regions in France.
A total of 14 French departments were under a heatwave red alert on Friday.
About three-quarters of the French population are affected by the orange and red heatwave alert.
On Saturday evening, the situation remained extreme, unprecedented, with exceptionally high temperatures never before observed so early in the season, Le Figaro reported.
The French government has also set up a "heat" line to help people in need in case of emergency.
Across the English Channel, Britain's Met Office has issued a level-three warning, the second highest, for the heatwave in London, southeast and east England, as the temperature rose to 33 degrees Celsius, the highest since summer 2020.
The UK Health Security Agency has issued a level-three heat-health alert across London, the southeast and east England, which requires social and healthcare services to target specific actions at high-risk groups.
Stephen Dixon, a Met Office spokesperson, told the media that temperatures in the early 30s were "not unprecedented but it is unusual to see temperatures this high this early in the year".