Weather will likely play an important role when you plan your trip to Potosi, but bear 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 temperature of 10°C, while the coldest months are July and June, with an average of 7°C. The rainiest months in Potosi are January, December, February and March, with each month seeing an average of 187 mm of rainfall.