Other facts from our historical weather data: Which is the warmest month in Ottsjö? July has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Ottsjö? The coldest month is February with an average maximum temperature of -3°C (27°F). Which is the wettest month in Ottsjö? July tops the wettest month list with 126mm (5 in) of rainfall. Which is the driest month in Ottsjö? April is the driest month with 58mm (2.3 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.