Other facts from our historical weather data: Which is the warmest month in Rovaniemi? July has an average maximum temperature of 21°C (70°F) and is the warmest month of the year. Which is the coldest month in Rovaniemi? The coldest month is January with an average maximum temperature of -6°C (21°F). Which is the wettest month in Rovaniemi? July tops the wettest month list with 86mm (3.4 in) of rainfall. Which is the driest month in Rovaniemi? March is the driest month with 39mm (1.5 in) of precipitation. Which is the sunniest month in Rovaniemi? June is the sunniest month with an average of 272 hours of sunshine. 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.