Temperatures remain comfortable throughout South Korea in November and you will encounter much less rain than September and October can bring. The onset of winter snow is still a month away and the humidity of summer is a distant memory.
Mild temperatures and low rainfall characterise the weather conditions across South Korea in November. In the northern capital of Seoul the temperature is likely to be a minimum of 7°C and a maximum of 19°C; whilst in the southern coastal regions things remain a little more balmy, with Jeju Island typically enjoying temperatures in the range of 15-21°C. If you plan on heading into the mountainous regions of Songnisan National Park, you should still pack a few extra layers as it can get chilly in the evenings.
In essence, favourable weather conditions in November make it a good time of year to visit South Korea.