Other facts from our historical weather data: When is winter in Rauma? The coldest season / winter is in the following months: January, February and March. Which is the warmest month in Rauma? July has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Rauma? The coldest month is February with an average maximum temperature of -0°C (32°F). Which is the wettest month in Rauma? October tops the wettest month list with 80mm (3.1 in) of rainfall. Which is the driest month in Rauma? April is the driest month with 38mm (1.5 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.