If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Hoa Lu: The hottest months are usually June and July with an average temp of 85°F, while the coldest months are January and December with an average of 67°F. The rainiest months in Hoa Lu are August, September, July, and October, with each month seeing an average of 12 inches of rainfall.