French authorities have reported around 20 drowning deaths over the weekend as people sought relief from an intense heatwave by swimming in unsupervised areas across the country.

Officials warned that dangerous temperatures have prompted many residents to take risks near rivers, lakes and other unauthorized swimming locations, leading to a spike in water-related fatalities.

Sports Minister Marina Ferrari urged the public to exercise caution, stressing that swimming in unmonitored areas during extreme weather conditions can be hazardous.

“To go swimming in unauthorized areas during a heatwave is not something to take lightly,” Ferrari told France Inter radio.

The warning came as forecasters predicted temperatures approaching 40 degrees Celsius (104 degrees Fahrenheit) in many parts of France.

The heatwave has also been linked to several other deaths. Local authorities in southeastern France said extreme temperatures were the most likely factor in the deaths of two young children, aged two and four, who were found unconscious inside a vehicle outside their home in the city of Carpentras.

In the Bordeaux region, three additional people between the ages of 80 and 95 died from heat-related medical complications, according to local official Sophie Brocas.

The ongoing heatwave has shattered temperature records in several cities, including Bordeaux and Poitiers, while placing increased strain on electricity networks, healthcare services and public infrastructure.

France’s national weather agency has placed 54 departments under the highest-level red heat alert, warning that the extreme conditions could continue for several days.

The country, where air conditioning remains relatively uncommon compared with many other nations, has implemented a range of emergency measures to protect vulnerable populations. Schools in several regions have either closed early or adjusted schedules to reduce students’ exposure to the heat.

The latest fatalities have intensified concerns about the growing impact of extreme weather events across Europe, where scientists warn that climate change is increasing the frequency and severity of heatwaves.

Authorities continue to urge residents to stay hydrated, avoid prolonged exposure to the sun and monitor children, elderly people and those with existing health conditions during the ongoing period of extreme heat.