Other facts from our historical weather data: Which is the warmest month in Modane? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Modane? The coldest month is January with an average maximum temperature of -4°C (25°F). Which is the wettest month in Modane? November tops the wettest month list with 126mm (5 in) of rainfall. Which is the driest month in Modane? August is the driest month with 76mm (3 in) of precipitation. Which is the sunniest month in Modane? July is the sunniest month with an average of 262 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.