Taking into account the local weather in Onaway 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 63°F, while the coldest months are February and January with an average of 25°F. The snowiest months in Onaway are January, November, March, and February, with each month seeing an average of 16 inches of snowfall.