Other facts from our historical weather data: Which is the warmest month in Port McNeill? 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 Port McNeill? The coldest month is January with an average maximum temperature of 6°C (43°F). Which is the wettest month in Port McNeill? November tops the wettest month list with 359mm (14.1 in) of rainfall. Which is the driest month in Port McNeill? July is the driest month with 86mm (3.4 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.