Other facts from our historical weather data: When is winter in San Giorgio? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in San Giorgio? July has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in San Giorgio? The coldest month is January with an average maximum temperature of -2°C (28°F). Which is the wettest month in San Giorgio? June tops the wettest month list with 145mm (5.7 in) of rainfall. Which is the driest month in San Giorgio? January is the driest month with 56mm (2.2 in) of precipitation. Which is the sunniest month in San Giorgio? May is the sunniest month with an average of 185 hours of sunshine. 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.