Taking the local weather in Cap-aux-Os into account can help you maximise your time at the pool during your trip. The hottest months are usually August and July, with an average temperature of 15°C, while the coldest months are February and January, with an average of -7°C. The snowiest months in Cap-aux-Os are March, January, February and November, with each month seeing an average of 79 cm of snowfall.