Other facts from our historical weather data: Which is the warmest month in Bourg-Saint-Pierre? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Bourg-Saint-Pierre? The coldest month is January with an average maximum temperature of -5°C (23°F). Which is the wettest month in Bourg-Saint-Pierre? December tops the wettest month list with 136mm (5.4 in) of rainfall. Which is the driest month in Bourg-Saint-Pierre? September is the driest month with 106mm (4.2 in) of precipitation. Which is the sunniest month in Bourg-Saint-Pierre? 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.