Photo : YONHAP News
Skies will be mostly clear across the country, although Jeju Island is expected to remain under partly cloudy conditions.
Saturday will begin with fair weather in the central region before clouds move in later in the day, while southern areas and Jeju will see cloudy periods.
Morning fog is forecast for parts of the central region, with visibility dropping below one kilometer in some locations.
Drivers are advised to exercise caution, especially near coastal roads and areas surrounding rivers, lakes and valleys, where fog may be thicker.
Morning lows are expected to range between eleven and 18 degrees Celsius, while afternoon highs will reach 23 to 30 degrees nationwide.
In Seoul, temperatures will fall to 16 degrees in the morning before rising to 28 degrees in the afternoon.
The temperature gap between day and night could approach 15 degrees in many parts of the country, increasing the risk of health problems caused by sudden changes in temperatures.
Seasonal early summer weather is expected to persist in the coming days, without any significant heat waves.
Light rain of around five millimeters is forecast for parts of Busan, Ulsan and the eastern coast of southern North Gyeongsang Province on Sunday.