Météo France has once again issued a red weather warning - the highest level - for just over a third of the country.
Events are being cancelled in many places, including the popular Bal des pompiers festival in Paris. The Eiffel Tower is also closing early, AFP reports.
The extreme heat has also had consequences in drowning incidents. Since June 19, 131 people have died, which is an increase of 20 percent compared with the same period last year.
The forest fire season has also started unusually early. Around 25,000 hectares have gone up in smoke in more than 8,000 fires so far this year.
"We are experiencing an exceptionally intense start to the forest fire season," Civil Defence Minister Julien Marion said on Friday.
