Taking into account the local weather in Cao Bang is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually July and June with an average temp of 78°F, while the coldest months are January and December with an average of 59°F. The rainiest months in Cao Bang are June, August, July, and May, with each month seeing an average of 12 inches of rainfall.