The nationwide average temperature over 24 hours hit 27.1 degrees Celsius (81 Fahrenheit), Meteo France announced Wednesday -- ahead of an expected peak in the August hot spell expected in the second half of the week.
Such continuously high temperatures have never been recorded so late in summer in records going back to 1947, the weather authority added.
Monday had already brought temperatures topping the previous 26.6 C record set in 2012.
Some 19 of mainland France's 96 departments were on red alert for heat on Wednesday, with 37 others at the lower orange warning level.
"A lasting and intense heatwave is in place across the southern two thirds of the country," Meteo France said.
Maximum temperatures in southern regions including the Rhone valley, the Occitanie region bordering Spain and the Aquitaine region around Bordeaux could reach 42 C, the authority added.
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