August in Valdivia is the rainiest and the windiest month of the year. In August, the weather in Valdivia is typically warm. Average daily high temperature in August is about 10 degrees above zero. On average, Valdivia has 27 rainy and 4 sunny days in August. The rains are usually heavy. August as well as May, June, and July is considered the most uncomfortable time to visit Valdivia.