Other facts from our historical weather data: Which months have the greatest rainfall in Potosí? Most rainfall (rainy season) is seen in January and February. Does Potosí have a dry season? Yes, the months of May, June, July and August are very dry. Which is the warmest month in Potosí? October has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Potosí? The coldest month is July with an average maximum temperature of 16°C (61°F). Which is the wettest month in Potosí? January tops the wettest month list with 188mm (7.4 in) of rainfall. Which is the driest month in Potosí? June is the driest month with 4mm (0.2 in) of precipitation. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.