If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Central Manitoulin: The hottest months are usually August and July with an average temp of 61°F, while the coldest months are February and January with an average of 24°F. The snowiest months in Central Manitoulin are January, February, November, and March, with each month seeing an average of 5 inches of snowfall.