Taking the local weather in Copper Harbor into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually August and July, with an average temperature of 14°C, while the coldest months are February and January, with an average of -5°C. The snowiest months in Copper Harbor are January, March, February and May, with each month seeing an average of 24 cm of snowfall.