Temperatures have been forecast to peak on Monday, and authorities have warned they could match historic highs.
The government has called for limits on alcohol consumption “to preserve emergency and healthcare services and allow medical staff to focus on caring for the most vulnerable”.
The heatwave has been going for days and has disrupted the country, forcing the cancellation of dozens of trains and the suspension of classes.
France’s weather service Météo-Franc, said it was “uncertain” how long the heatwave, which has been estimated to affect about three quarters of the population, would last.
To help Parisians and tourists cope with the heat, authorities are keeping parks and gardens in the French capital open through the night.
Fête de la Musique has been going for more than 40 years, and is always held on the summer solstice.
Last year, about two million people attended events in Paris.
