Clear skies nationwide, but strong winds and temperatures up to 31C

South Korea will see mostly clear skies on Friday, but powerful winds will sweep across the country as temperatures rise as high as 31C.

The Korea Meteorological Administration said a high-pressure system moving east from northeastern China will bring generally clear conditions. The Gangwon coast and mountains and Jeju Island will be cloudier. Jeju could receive 5 to 20 millimeters of rain by Friday afternoon, while rain in Gangwon may continue until Saturday night, with many areas seeing a temporary break from late Friday afternoon into the evening.

Daytime highs are expected to range from 26C to 31C, close to or slightly above seasonal averages. Seoul and Incheon could reach 30C, while Gwangju may reach 31C. Jeju, where a heat advisory is in effect, could see perceived temperatures around 33C. Perceived temperatures in the Jeolla region are expected to remain around 31C.

Gusts of at least 55 kph are forecast across most areas, rising above 70 kph in mountainous regions. Winds could reach 70 kph or more along the southern coast of South Gyeongsang and around Jeju, and more than 90 kph in mountainous areas. Authorities warned that strong winds could disrupt air travel.

Rough seas are also expected. Waves of 2 to 4 meters are forecast in parts of the East and South seas, with some areas around Jeju and offshore waters seeing waves above 5 meters. Strong swells could send waves over beaches, rocks and breakwaters along the east coast, the southern coast of Gyeongsang and Jeju, prompting a warning to avoid coastal activities such as fishing. Fine dust levels are expected to remain good nationwide.