Taking the local weather in Onaway 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 19°C, while the coldest months are December and January, with an average of 0°C. The snowiest months in Onaway are December, January, February and April, with each month seeing an average of 21 cm of snowfall.