Thousands of hectares have been scorched, and more than 5,000 people have had to leave their homes due to the fires.
In Tres Cantos, which is located just north of the capital Madrid, a man who was employed at a riding center died. According to media reports, he tried to save the horses - but did not escape the flames that destroyed the riding facility.
The fire in Tres Cantos has developed positively during the night until Wednesday, while the fire raging in Ourense in northern Spain is described as the most serious.
Also in Castile and León in northwestern Spain, a man was killed during the extinguishing work.
The dry winds are described as the fire department's greatest enemy and are feared to make the situation even worse in the coming days.
Prime Minister Pedro Sanchez writes on X that there is an extreme risk of forest fires, and urges great caution.
Similar conditions are seen in other parts of Europe, which have been struggling with a heat wave lately. In Portugal, several fires are raging, as well as in Greece and the Balkans. In Montenegro, a soldier has died in a fire.
In southern France and Italy, among other things the major cities of Rome, Milan and Florence, several warnings have been issued due to high temperatures that are often over 40 degrees on the thermometer.
