August in Popayan is the sunniest month of the year. In August, the weather in Popayan is typically warm. Average daily high temperature in August is about 22 degrees above zero. On average, Popayan has 24 rainy, 4 cloudy, and 3 sunny days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Popayan.