Weather will likely play an important role when you plan your trip to Giao Thuy, but bear 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 temperature of 29°C, while the coldest months are January and December, with an average of 20°C. The rainiest months in Giao Thuy are August, September, July and October, with each month seeing an average of 323 mm of rainfall.