On Friday the State Meteorological Agency issued a warning for the arrival of the second heatwave of the summer of 2026, a weather episode that starts this Sunday and will bring temperatures of up to 42ºC in river valleys in the south-west of the mainland, and is expected to last at least until Tuesday.
According to the agency’s own data, on Monday temperatures are forecast to reach 38–40ºC in the Minho valley and 37–39ºC in the interior of A Coruña, while in the south-western quadrant maximums of 39–41ºC will be widespread, rising to 42ºC in river valleys, with temperatures of 37–40ºC on the southern plateau, in the Ebro valley and in north-eastern depressions.
Contrary to what might be thought, the peak of the episode will not arrive on Tuesday. According to AEMET, Monday 6 will be the harshest day of the period, with further rises in temperatures in the eastern Cantabrian area that will also spread, to a lesser extent, to the Ebro valley, the northern plateau and the eastern third of the mainland, with temperatures possibly reaching 44ºC on Tuesday which would complicate the Bisbal d'Empordá wildfire, while in western Galicia the arrival of maritime air will begin to be felt, bringing temperatures down along the coast.
