Weather is probably a major factor when you plan your trip to Nambu-myeon, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 75°F, while the coldest months are January and February with an average of 45°F. The rainiest months in Nambu-myeon are July, September, August, and June, with each month seeing an average of 10 inches of rainfall.