Other facts from our historical weather data: Which is the warmest month in Alert Bay? August has an average maximum temperature of 18°C (64°F) and is the warmest month of the year. Which is the coldest month in Alert Bay? The coldest month is January with an average maximum temperature of 6°C (43°F). Which is the wettest month in Alert Bay? November tops the wettest month list with 355mm (14 in) of rainfall. Which is the driest month in Alert Bay? July is the driest month with 88mm (3.5 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.