I've encountered mid 30s centigrade on the Plata in late October and early November near Seville. Once I had no rain from Seville to Sanabria. Last year was the longest drought in ~40 years and I had no rain between Tarifa in mid October and Portugal (left the Plata at Salamanca), also the highest November temperature in that area in 34 years. One year I got soaked north of Fuenterroble, but was otherwise dry, and one year I got frostbite in freezing fog just south of Zamora. Last year was the only one of my six times on it that I didn't get soaked at some point on the Sanabrés.