January in Potosi is the rainiest month of the year. In January, the weather in Potosi is typically warm. Average daily high temperature in January is about 14 degrees above zero. On average, Potosi has 27 rainy, 2 sunny, 1 cloudy, and 1 partly cloudy day in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Potosi.