A fourth summer heatwave has recently struck Spain, causing northern regions to experience unusually high temperatures exceeding 40 degrees Celsius on Sunday.

Temperatures surged across Spain over the weekend, particularly in the historically cooler northern areas near the Cantabrian Sea, prompting 'extreme risk' alerts in Cantabria and the Basque Country, according to AEMET, the Spanish weather service. In Bilbao, one of the most severely affected cities in the Basque Country, people were seen wearing hats and using fans to cool down. 'It's too hot, you can't just be in the streets, neither at the beach,' Josefa Castillo told Reuters. Belgian tourist Patrick Heremans expressed his shock at the heat: 'We're unused to this kind of temperature, but we're going to the museum today, where there's air conditioning,' he said.

Spain's health ministry advised the public to stay hydrated, shield themselves from the sun, and pay special attention to children and the elderly. The Spanish weather service predicts that temperatures will begin to decrease on Monday.