It is expected that the sizzling temperatures will begin on Thursday and will last through the weekend with all time highs due to be recorded.
In northern Europe , Sweden is still under threat from wildfire which in recent weeks have extended into the Arctic Circle.
Thousands of Brits will be jetting off on their holidays this week with Spain and Portugal two very popular destinations.
If the weather forecast is confirmed, it would be the most significant heatwave in Europe in the last 41 years.
By the numbers: The heat is expected to crank up in coming days, with computer models projecting astonishing high temperatures of at least 118°F to 122°F, or 50°C, in southwest Spain and Portugal during the next few days.
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Portugal's highest temperature ever recorded was 47.4 degrees (117.3 Fahrenheit) in 2003.
With nearly no rainfall since May, Sweden experienced its hottest July in more than 250 years, with the drought and high temperatures sparking wildfires across the country, even as far north as the Arctic Circle.
The heat wave hit Friday, breaking local temperature records at eight places in Portugal. Fires in Greece, Sweden, Finland, Norway, and Latvia have killed dozens of people and forced evacuations. "They include the head of the civil protection agency, the governor of Attica, the mayor of Marathon and the police and fire service", Antonis Foussas, the plaintiffs' lawyer said.
Met Office meteorologist Nicola Maxey said: "Temperatures will increase by a couple of degrees day by day with highs in the upper 20Cs quite widely by Friday and into the low 30Cs in places at the weekend".
BBC Weather forecaster Chris Fawkes warned hot weather will continue to engulf Europe this weekend as temperatures reach highs of 47C in Portugal and go past the 30C mark again in the UK.
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Fires raged through a coastal town in Greece in July leaving more than 91 people dead and some affected families are now filing a lawsuit against the Greek authorities.
A boy jumps from a dock to the sea during a hot summer day in Barcelona, Spain.
Lisbon's temperature reached 43 degrees Celsius.
Although that temperature is far below the scorchers hitting southern Europe, it's well above the Russian capital's average August maximum of 23 degrees.
June's average United Kingdom maximum temperature was 19.9C, the same as June 1976. In Sweden, July was a record hot month and wildfires burnt in parts of the country.
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