Other facts from our historical weather data: Which is the warmest month in Bomi? August has an average maximum temperature of 15°C (59°F) and is the warmest month of the year. Which is the coldest month in Bomi? The coldest month is January with an average maximum temperature of -7°C (19°F). Which is the wettest month in Bomi? July tops the wettest month list with 255mm (10 in) of rainfall. Which is the driest month in Bomi? December is the driest month with 61mm (2.4 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.