Seoul: Heavy rain is predicted to affect most regions of South Korea on Sunday, with the southern island of Jeju and other southeastern areas expecting downpours of up to 80 millimeters per hour, according to the state weather agency.

According to Yonhap News Agency, rain will begin in the southwestern provinces and Jeju during the day and will gradually spread to the southeastern and central regions, eventually covering most of the country, except for areas along the East Sea. The Korea Meteorological Administration (KMA) noted that the rainfall is expected to continue through Tuesday, with precipitation forecast to reach up to 150 mm in the southern regions, including the southern port city of Busan. The administrative city of Sejong and other central regions are predicted to receive up to 100 mm of rain.

The agency further added that heavy downpours of 50 to 80 mm per hour are expected at night along parts of the southern coast of South Jeolla Province, around Mount Jiri, and in Jeju's mountainous areas. Strong winds are also anticipated for the west coast of South Jeolla Province, with gusts exceeding 20 meters per second later in the day.

As the rain moves in, heat wave advisories are expected to be gradually lifted or eased. Daytime high temperatures will range between 29 and 34 C, similar to or slightly higher than seasonal norms, the KMA reported.