Cherry blossom arrived in Seoul on Friday last week, when daytime temperatures rose to 23.8 degrees Celsius. This is 18 days sooner than last year and the first time cherry blossom started to bloom in March since records began in 1922.
The Korea Meteorological Administration predicted that cherry blossom will be in full bloom this weekend.
The reason for the warm weather is that the center of an anticyclone sent warm breezes from the southwest into Korea.
Many people were out in short sleeves this weekend, and department stores are displaying summer clothing already.
The KMA forecast that the warm weather will continue, with the daytime high remaining around 20 degrees.