Weather is probably a major factor when you plan your trip to Jumunjin-eup, but bear 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 temperature of 21°C, while the coldest months are January and February, with an average of 1°C. The rainiest months in Jumunjin-eup are August, July, September and June, with each month seeing an average of 211 mm of rainfall.