Weather will likely play an important role when you plan your trip to Gwangju, 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 74°F, while the coldest months are January and February with an average of 37°F. The rainiest months in Gwangju are July, August, June, and September, with each month seeing an average of 8 inches of rainfall.