Visiting local bars in San Martín del Castañar is more fun when the weather is good. These rainfall averages and temperatures can help you decide the best time for bar-hopping. The hottest months are usually August and July, with an average temperature of 25°C, while the coldest months are January and February, with an average of 8°C. Average annual precipitation for San Martín del Castañar is 823 mm.