Spain also issued warnings of extreme heat for its southern areas with temperatures expected to reach 45 C in the cities of Sevilla, Huelva, Badajoz and Cordoba.
Climate change means that extreme temperatures are more likely, Mitchell said, adding that by 2040, temperatures like the ones that Europe is now facing could become "the new normal".
However, climatologist Fatima Espírito Santo of the Portuguese Institute of the Sea and the Atmosphere, told the Observador that the increase is not a heatwave, because the spell of higher temperatures will only last three days, not five.
Eight places across the centre, south and east of the country have already broken their local temperature records in the unprecedented hot weather.
Some predictions have said certain regions could see highs of 48C, which would break Portugal's record of 47.4C from 2003.
The Evening Standard have the details on a middle-aged man in Barcelona was found in the street after he collapsed, as well as two other men, a road worker and a 78-year-old man, who also died from heatstroke.
"This extremely hot and dry wind is known as a Terral wind in Spain".
Hot air from Africa is bringing a new heatwave to Europe, prompting health warnings about Sahara Desert dust and exceptionally high temperatures that are forecast to peak at 47 degrees Celsius (116.6 Fahrenheit) in some southern areas.
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Neighbouring Portugal has been described as "Hot as Hell" as temperatures have risen to 46 degrees this afternoon.
"Oh it's bad", said tourist Paul Snell.
The U.K.is now enjoying a slightly more tolerable period of hot weather, with much of England's southeast region expected to see levels of 86 degrees Fahrenheit (30 degrees Celsius) this weekend.
Boiling heat will blow across Europe this week as the UK's hottest summer continues.
Finland's August average is 19 degrees Celsius but temperatures approached 30 degrees Celsius this week and few have air-conditioning at home. EDF said the decision was made to avoid overheating the rivers.
114 people were killed in two massive forest blazes a year ago in Portugal and civil services yesterday sent mobile text alerts warning the population of an extreme risk of fires in some regions, including around the capital Lisbon.