Health and fire warnings have been issued in southern Europe, with temperatures expected to exceed 40 degrees Celsius in some places over the weekend.
Italy, Greece, France, Spain and Portugal affected countries – Spain's Seville city is forecast to reach 42 degrees Celsius.
Hot air from North Africa is spreading to resorts such as Croatia in the Balkans, promoting high temperatures.
The BBC weather says heat waves are very strong at this time of year – the mainland usually experiences such high temperatures in July and early August.
In Spain, emergency personnel have been back-up to deal with the surge in stroke cases, especially among vulnerable groups including children, the elderly and chronic diseases.
Italian authorities are providing consulting services to residents of several cities, including Rome, Milan and Venice – where several A-List celebrities gathered at the wedding of Amazon founder Jeff Bezos and TV host Lauren Sanchez – stayed indoors between 11:00 and 18:00 local time.
Meanwhile, France has been experiencing a heat wave for more than a week. The Orange Hot Alert was the second highest warning to the southern region on Friday.
In Marseille, municipal swimming pools are open for free until the end of the heat wave.
This weekend, there are also yellow and amber alerts in parts of England, with temperatures reaching 32C. The heat wave is expected to last until Tuesday night.
Wildfires have hit certain parts of Europe, including Greece, where coastal towns near Athens have been erupted by flames, destroying houses – forcing people to evacuate.
Although it is difficult to associate individual extreme weather events with climate change, heat waves are becoming increasingly common and increasingly intense due to climate change.
Scientists in the world weather attributes analyze the impact of climate change on extreme weather events, scientists who say that compared with the pre-industrial era, Heatwaves are now about 10 times more likely to occur for more than three consecutive days.
