Other facts from our historical weather data: When is the rainy season in Lech am Arlberg? Rainy season in Lech am Arlberg occurs in the months of May, June, July, August and September. When is winter in Lech am Arlberg? The coldest season / winter is in the following months: January, February and December. Which is the warmest month in Lech am Arlberg? 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 Lech am Arlberg? The coldest month is January with an average maximum temperature of -1°C (30°F). Which is the wettest month in Lech am Arlberg? June tops the wettest month list with 231mm (9.1 in) of rainfall. Which is the driest month in Lech am Arlberg? 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.