If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Collingwood: The hottest months are usually February and January with an average temp of 63°F, while the coldest months are July and August with an average of 53°F. The rainiest months in Collingwood are May, June, August, and July, with each month seeing an average of 8 inches of rainfall.