Other facts from our historical weather data: Which is the warmest month in Magnetun? 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 Magnetun? The coldest month is December with an average maximum temperature of -3°C (27°F). Which is the wettest month in Magnetun? July tops the wettest month list with 110mm (4.3 in) of rainfall. Which is the driest month in Magnetun? February is the driest month with 49mm (1.9 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.