Weather will likely play an important role when you plan your trip to Owen Sound, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 18°C, while the coldest months are February and January, with an average of -4°C. The snowiest months in Owen Sound are January, February, December and November, with each month seeing an average of 58 cm of snowfall.