Between September and November, autumn is in full bloom in Korea. Besides favorable weather for travel and outdoor activities, it is also harvest season so there is a good variety of food to experience.
While September weather still reminds of summer, October marks the transition to colder and drier weather. Asian cold frontal systems result in increasing cloudiness, some light rain is also possible. Fog is typical for lower latitudes. But by the end of autumn skies get more clear, and it gets significantly dryer.