Health warnings were issued to tens of millions of Europeans as temperatures climbed well above 100 degrees Fahrenheit, or more than 40 degrees Celsius.

Dozens of the country's mainland regions are currently under the second-highest alert as the heatwave continues.

The heat wave searing western Europe is set to peak in the coming days, threatening power networks and triggering health alerts. A high-pressure system combined with a stream of super-hot air from North Africa and abnormally warm oceans is baking the region from Portugal to the UK.