Spain is set to enter its third heatwave of the summer as temperatures rise above 40°C across large parts of the country, according to Spain’s national weather service. The heatwave begins Tuesday and is driven by a persistent area of high pressure that keeps hot, dry air from North Africa over Spain for several days. Forecasters say the conditions are expected to intensify through Thursday, which is likely to be the peak of the event. Some isolated areas could see temperatures exceed 45°C.

The weather agency warns that the danger level is significant during central daytime hours, particularly for outdoor activities and for vulnerable people. The heatwave is part of a broader summer trend: Spain has already experienced two other heatwaves this season, including one in late June and another in early July. The reporting also notes that Spain’s mainland has recorded its hottest first half of summer since records began in 1961.

Scientists cited by one outlet say human-driven climate change is increasing the length, intensity, and frequency of heatwaves. Earlier this month, a wildfire in Almeria killed 13 people, described as Spain’s deadliest wildfire in recent years.