August in Tarija is the sunniest month of the year. In August, the weather in Tarija is typically warm. Average daily high temperature in August is about 18 degrees above zero. On average, Tarija has 23 sunny, 5 partly cloudy, 2 rainy, and 1 cloudy day in August. The rains are usually light. August as well as July is considered the most comfortable time to visit Tarija.