Other facts from our historical weather data: Which is the warmest month in Courmayeur? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Courmayeur? The coldest month is January with an average maximum temperature of -4°C (25°F). Which is the wettest month in Courmayeur? December tops the wettest month list with 147mm (5.8 in) of rainfall. Which is the driest month in Courmayeur? September is the driest month with 102mm (4 in) of precipitation. Which is the sunniest month in Courmayeur? July is the sunniest month with an average of 275 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.