Other facts from our historical weather data: Which is the warmest month in North Head? 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 North Head? The coldest month is January with an average maximum temperature of 2°C (36°F). Which is the wettest month in North Head? December tops the wettest month list with 152mm (6 in) of rainfall. Which is the driest month in North Head? July is the driest month with 87mm (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.