Other facts from our historical weather data: Which is the warmest month in Brønnøysund? July has an average maximum temperature of 17°C (63°F) and is the warmest month of the year. Which is the coldest month in Brønnøysund? The coldest month is February with an average maximum temperature of 2°C (36°F). Which is the wettest month in Brønnøysund? September tops the wettest month list with 218mm (8.6 in) of rainfall. Which is the driest month in Brønnøysund? May is the driest month with 111mm (4.4 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.