Southern Europeans braced Saturday for their first heatwave of the northern hemisphere summer, as climate change pushes thermometers on the world’s fastest-warming continent increasingly into the red.

Temperatures are set to rise to 37 degrees Celsius (99 Fahrenheit) in Rome, driving the Eternal City’s many tourists and pilgrims towards the Italian capital’s 2,500 public fountains for refreshment.

With residents of the southern French port city of Marseille expected to have to cope with temperatures flirting with 40C (104F), the city’s authorities ordered public swimming pools be free of charge to help residents beat the Mediterranean heat.