In addition to spreading to Spain, Croatia, and Greece, flames in the south-west of France have forced the evacuation of more than 14,000 people.
Authorities have removed guards from campsites in France's Gironde, a well-known tourist destination, as the visitors have already departed. In the regions of Teste-de-Buch and Landiras, fires have spread.
More than 3,200 people left flames in the Mijas hills in southern Spain, however some were eventually permitted to return.
Fires in Portugal have currently been put out.
The Portuguese government claims that 659 individuals have passed away from the heat in the last week, largely the elderly.
The major tourist destination of Málaga is not far from the Mijas fires in Spain. Wildfires have started in the provinces of Castilla y León, Galicia, and Extremadura among other parts of Spain.
Numerous waterbombing aircraft have been deployed, together with thousands of firemen, across the Mediterranean, from Crete in the east to Morocco in the west. The area has been experiencing extreme heat since Tuesday, which has dried out the plants to the bone.
Due to human-induced climate change, heatwaves are now more common, more powerful, and stay longer. Since the start of the industrial period, the world has already warmed by around 1.1C, and temperatures will continue to rise unless governments drastically reduce carbon emissions.
In the country's south, the French meteorological office has projected Sunday highs of up to 41C (106F), and Monday is expected to set new heat records. Recently, the temperature in Portugal rose to 47C.
As the nation prepares for record-breaking heat on Monday and Tuesday, which might reach 41C in some areas, the UK has issued an amber warning for extreme heat.
According to Dr. Eunice Lo, a climate scientist at Bristol University, "increasing temperatures are a marker of climate change" and that heatwaves are responsible for an additional 2,000 fatalities each year in the UK.
The top 10 warmest years in the UK since 1884, according to public statistics, have all occurred since 2002, she said. Dr. Lo stated that "heatwaves are growing more frequent and lasting longer" globally. "We must cease using fossil fuels and take immediate action."
In order to combat forest fires in the north, Morocco has forced more than 1,300 residents to leave their houses and sent out extra firemen. Larache province is the worst-affected region.
Greek firemen are fighting a significant fire in the hills surrounding Rethymno, on Crete's north coast. They said that it had been partially contained on Saturday.
Wildfires are also causing problems in a few locations in southwest Turkey and along the Adriatic coast of Croatia. Near the Croatian vacation towns of Zadar and Sibenik, a number of fires started, but none have resulted in widespread evacuations.
France put 22 more regional departments on high orange alert late on Saturday night, largely along its Atlantic coast.
One inhabitant of south-west France said it seemed "post-apocalyptic" there because of the forest fires. There, 10,500 hectares (26,000 acres) of land had burnt in fires, and interior minister Gerald Darmanin lauded the "amazing heroism" of the firemen.