The highest temperature recorded Thursday, when the heat began to rise, was 45.2 C (113.4 F) near Abrantes, a town 150 kilometers (93 miles) northeast of the capital, Lisbon, the country's weather agency IPMA said.
In Spain, heat warnings were also issued for 41 of the country's 50 provinces as temperatures were expected to reach up to 44 C (111.2 F). Spain's highest recorded temperature is 46.9 C (116.42 F) in Cordoba, a southern city, in July 2017.
The World Meteorological Organization says continental Europe's record is 48 C (118.4 F) in Greece in 1977. In northern Europe, Sweden was still under threat from wildfires, which in recent weeks have extended into the Arctic Circle.