Other facts from our historical weather data: When is the rainy season in Bach? Rainy season in Bach occurs in the months of May, June, July, August and September. When is winter in Bach? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Bach? 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 Bach? The coldest month is January with an average maximum temperature of -2°C (28°F). Which is the wettest month in Bach? June tops the wettest month list with 237mm (9.3 in) of rainfall. Which is the driest month in Bach? January is the driest month with 114mm (4.5 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.