Weather is probably a major factor when you plan your trip to Nongstoin, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually June and August with an average temp of 70°F, while the coldest months are January and December with an average of 57°F. The rainiest months in Nongstoin are July, June, August, and September, with each month seeing an average of 36 inches of rainfall.