Residents and holidaymakers have fled towns and villages in France as fires are whipped up by high winds and tinder-dry conditions in several countries in Europe.
More than 10,000 people have been forced to leave the south-western Gironde region in the past few days.
Dozens of fires are burning in Portugal and Spain where temperatures have surged above 40C.
At least 281 deaths in the two countries were linked to the heatwave.
Several towns in western Spain have been evacuated.
The head of France's firefighters' federation has warned of the impact global warming is having on civil protection. "It's firefighters, civil security who deal with the effects on a daily basis - and these effects aren't in 2030, they're right now," said Grégory Allione.
Heatwaves have become more frequent, more intense, and last longer because of human-induced climate change. The world has already warmed by about 1.1C since the industrial era began and temperatures will keep rising unless governments around the world make steep cuts to emissions.
Firefighters in Spain fought to protect the town of Monsagro as fires erupted further south in the Monfragüe national park, home to rare species of birds. The main N-5 route in Cáceres just east of the park was cut off when a forest fire reached the road.