Weather will likely play an important role when you plan your trip to Potosi, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and November with an average temp of 49°F, while the coldest months are July and June with an average of 44°F. The rainiest months in Potosi are January, December, February, and March, with each month seeing an average of 7 inches of rainfall.