There are now 11 departments under an orange heatwave alert as temperatures approach 40C in some areas of south-west France.
Gard, Vaucluse, Alpes-de-Haute-Provence and Pyrénées-Orientales have now joined Gironde, Lot-et-Garonne, Tarn-et-Garonne, Haute-Garonne, Tarn, Ardèche and Drôme on the second-highest alert level.
Some 30 departments surrounding the areas on orange alert are also under yellow warnings.
Today, temperatures were expected to reach 39-40C in the south west and the Rhône valley and 33-35C in central France.
The weather was set to cool slightly in more northerly regions, with temperatures of 23-29C in the north and north west and 31-33C in Ile-de-France.
However, this drop will not last, as national weather forecasting service Météo France expects temperatures to peak on Sunday and early next week.
Gironde is also on an orange alert for wildfires as around 1,000 firefighters work to tackle two blazes which have burnt around 4,000 hectares of land in the department.
Do I need to take any action?
If you live in a department on orange alert for heat, you should:
Drink water several times a day
Spray your skin with water or take warm showers or baths to keep cool
Avoid going out between 11:00 and 21:00
Put on a hat and lightweight clothes if you do have to go out
Try to stay in a cool space at the hottest points in the day
Limit sporting or other physical activities
Close your windows, curtains and shutters during the day and open them at night
Check on elderly or vulnerable relatives and friends
Call a doctor if you feel unwell
You can also call your mairie if you need help