Weather is probably a major factor when you plan your trip to Collingwood, and keep in mind that cheaper options are usually available when the weather isn't as good. 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.