South Korea braces for cold nights, rising dust, and rough seas this weekend

South Korea is bracing for a typical spring weekend with a marked day-to-night temperature swing. Daytime highs are expected to top 10°C in many regions, but mornings and evenings will still feel chilly. The shift from cool to mild temperatures will be pronounced, so residents and travelers should plan for variable conditions.

Snow and rain on the East Coast have moved off further to the east, according to forecast updates. Nevertheless, nightly temperatures will fall enough to create icy patches on routes in the Gangwon and Gyeongbuk mountain areas, as well as along parts of the East Coast. Frost is also possible in the morning across the southern inland regions.

Air quality is expected to be generally acceptable tomorrow, but a shift is anticipated starting Sunday as fine dust from outside Korea is carried in by winds. By Sunday afternoon, fine-dust levels are forecast to rise nationwide, with ultrafine particles reaching “bad” levels in Seoul, parts of western Gangwon, and Chungcheong. Health authorities advise wearing a protective mask during the holiday period.

Specific temperatures to watch include Seoul starting around 3°C and Daejeon around 1°C, with daytime highs near 12°C for Seoul, 14°C for Daejeon, and 15°C for Gwangju and Daegu. These numbers illustrate a wide diurnal range, typical of Korea’s spring and an important consideration for outdoor activities and travel.

Coastal and sea conditions remain unsettled, with waves possibly reaching as high as 3.5 meters. Strong swells are expected along the East Coast and around Jeju Island, which could affect coastal travel, ferry schedules, and maritime operations in the region.

Looking ahead to midweek, the forecast calls for continued dust impacts through Wednesday, followed by rain chances in areas south of Chungcheong Province. For U.S. readers, the relevance lies in how these conditions can influence international travel plans, logistics, and supply chains tied to Korea’s manufacturing and export sectors, as well as cross-border air and sea transport.

Context for non-Korean readers: the East Sea is known internationally as the Sea of Japan in some maps, and Jeju Island is a major volcanic island off the southern coast of the Korean Peninsula. Seoul is the capital and largest city; Gangwon, Chungcheong, Gyeongbuk, Daejeon, Gwangju, and Daegu are major regional centers. The Korea Meteorological Administration issues nationwide forecasts that are closely watched by travelers, businesses, and regional governments.