Other facts from our historical weather data: Which is the warmest month in Utö? August has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in Utö? The coldest month is February with an average maximum temperature of 3°C (37°F). Which is the wettest month in Utö? November tops the wettest month list with 68mm (2.7 in) of rainfall. Which is the driest month in Utö? March is the driest month with 36mm (1.4 in) of precipitation. Which is the sunniest month in Utö? July is the sunniest month with an average of 283 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.