Weather will likely play an important role when you plan your trip to Ninh Binh, and keep in mind that cheaper options are usually available when the weather isn't as good. 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 Ninh Binh are August, September, July, and October, with each month seeing an average of 12 inches of rainfall.