Other facts from our historical weather data: When is the rainy season in Passo Rolle? Rainy season in Passo Rolle occurs in the months of May, June, July, August and September. When is winter in Passo Rolle? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Passo Rolle? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Passo Rolle? The coldest month is January with an average maximum temperature of 0°C (32°F). Which is the wettest month in Passo Rolle? June tops the wettest month list with 229mm (9 in) of rainfall. Which is the driest month in Passo Rolle? January is the driest month with 53mm (2.1 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.