Weather can make or break a roadtrip, so here's some data about year-round temperatures in Bac Kan to help you plan yours: The hottest months are usually June and July with an average temp of 79°F, while the coldest months are January and December with an average of 61°F. The rainiest months in Bac Kan are June, August, July, and May, with each month seeing an average of 16 inches of rainfall.