Taking into account the local weather in Alpena is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 64°F, while the coldest months are February and January with an average of 26°F. The snowiest months in Alpena are January, February, December, and March, with each month seeing an average of 11 inches of snowfall.