If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Owen Sound: 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.