If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Bac Giang: The hottest months are usually June and July with an average temp of 83°F, while the coldest months are January and December with an average of 65°F. The rainiest months in Bac Giang are August, July, May, and June, with each month seeing an average of 12 inches of rainfall.