Monday got off a to a clear start, with sunny skies in the afternoon.
Daytime high temperatures were expected to peak between 24-29 degrees Celsius before dropping to around 20 degrees overnight.
The weather outlook for Tuesday, Chuseok Day, shows rainfall.
Showers will first hit the capital area, Jeju, parts of Gangwon, Chungcheong and the Jeolla provinces in the early morning before spreading nationwide, according to the Korea Meteorological Administration.
Conditions should dry up over the course of the evening, but clouds will prevail on Wednesday.
