The southwestern region of Gironde in France has seen the worst of the blazes so far.
A total of 14,300 hectares (35,000 acres) of land have been burned as of Monday, with 24,000 people evacuated from the region, the Nouvelle-Aquitaine and Gironde prefecture said on Twitter.
Authorities have deployed 1,700 firefighters to tackle the fires. A spokesperson for the Gironde regional fire and rescue service said 12 firefighters have suffered minor injuries since the start of the operation.
Sweltering temperatures in Portugal have exacerbated a drought that started before the heat wave, according to data from the national meteorological institute. About 96% of the mainland was already suffering severe or extreme drought at the end of June.
‘Peak of intensity’
Monthly minimum temperature records could be broken across France Monday, according to the national weather agency. Météo-France identified nine localities where the monthly minimums look set to be broken, including Rostrenen in Brittany, northwestern France, where the record has stood since 1968.
In addition to Gironde, Météo-France issued a heatwave red alert to a total of 15 departments in western and southwestern regions, temperatures as are expected to reach as high as 42 degrees Celsius (108 degrees Fahrenheit) Monday. A further 51 regions have been placed under orange alert, including Paris, with residents urged to avoid going outside between 11 am and 9 pm local time.
“Given the peak of intensity expected for today, the chances are low that the mercury will drop sufficiently before the end of the day” for these records not to be broken, Météo-France added.
Since May, France has seen only eight days when average daily temperatures were below aggregated summer average temperatures. In the remaining 39 days, national daily averages have been above the average temperatures for this time of year observed between 1991 and 2020, according to Météo-France data.
Water supply may be “compromised” in the coming months, according to the report.
‘Hottest day in UK history’
The Met Office’s CEO, Penelope Endersby, said Monday may well be the “hottest day in UK history,” but Tuesday is “expected to be even hotter.”
“So it’s tomorrow that we’re really seeing the higher chance of 40 degrees and temperatures above that,” Endersby told BBC Radio on Monday.
“Even possibly above that, 41 is not off the cards. We’ve even got some 43s in the model but we’re hoping it won’t be as high as that.”
Endersby said while extreme temperatures are not expected beyond Tuesday, the Met Office will be monitoring the possibility of a drought in the coming months.
“We’re expecting a big drop in temperature overnight into Wednesday — down 10 or 12 degrees on what has been the days before,” she said, adding: “Our attention is turning, once we’re past these two days, to drought and when we might see any rain, and we’re not seeing any significant rain coming up.”
Joseph Ataman, Jimmy Hutcheon and Xiaofei Xu reported from Paris. Zahid Mahmood and Sana Noor Haq reported from London. CNN’s Renee Bertini, James Frater and Sharon Braithwaite contributed reporting to this post.