Other facts from our historical weather data: When is the rainy season in Holzgau? Rainy season in Holzgau occurs in the months of May, June, July, August and September. When is winter in Holzgau? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Holzgau? 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 Holzgau? The coldest month is January with an average maximum temperature of -2°C (28°F). Which is the wettest month in Holzgau? June tops the wettest month list with 241mm (9.5 in) of rainfall. Which is the driest month in Holzgau? January is the driest month with 118mm (4.6 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.