If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Collingwood: The hottest months are usually February and January, with an average temperature of 17°C, while the coldest months are July and August, with an average of 12°C. The rainiest months in Collingwood are May, June, August and July, with each month seeing an average of 204 mm of rainfall.