If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Glen Arbor: 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 27°F. The snowiest months in Glen Arbor are January, November, March, and February, with each month seeing an average of 15 inches of snowfall.