Other facts from our historical weather data: When is the rainy season in Riezlern? Rainy season in Riezlern occurs in the months of May, June, July, August and September. When is winter in Riezlern? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Riezlern? July has an average maximum temperature of 19°C (66°F) and is the warmest month of the year. Which is the coldest month in Riezlern? The coldest month is January with an average maximum temperature of 0°C (32°F). Which is the wettest month in Riezlern? June tops the wettest month list with 233mm (9.2 in) of rainfall. Which is the driest month in Riezlern? October is the driest month with 120mm (4.7 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.