South Korea Sees Mild Days, Chilly Nights as Ultrafine Dust Rises

A mild spell continues on the Korean Peninsula, even as a noticeable day-to-night temperature swing remains in store. In Paju, at the Byeokchoji Arboretum, temperatures were about 11.8°C, while Seoul reached 13.4°C. The daytime spell is comfortable for outdoor activity, but the mercury drops quickly after sunset.

By afternoon, the sky brightened only modestly, and people used the pleasant weather to stroll the arboretum and enjoy spring scenery. Yet officials warn that the early-evening chill will require wind- and temperature-appropriate clothing for an unseen dip after sundown.

Tomorrow, the weather is expected to become cloudier as air quality worsens. Incoming external ultrafine dust is forecast to reduce visibility and raise pollution levels. Central and western parts of the Seoul metropolitan area are expected to see ultrafine-dust levels in the “bad” range throughout the day, with southern regions worsening from evening onward.

Temperatures tomorrow should be similar to today: Seoul starting near 4°C with a daytime high around 13°C. Daejeon and Gwangju are forecast to begin near 3°C, rising to about 12°C, while Daegu could reach around 15°C. The overall pattern remains a typical spring swing, with mild afternoons yet chilly mornings and evenings.

Looking ahead, rain is projected for the middle of next week in areas south of the Chungcheong region, signaling a shift in the early-spring pattern. Coastal areas should prepare for unsettled conditions as the week progresses.

Additionally, swells are expected to rise along the East Sea and Jeju coast through at least the day after tomorrow. Higher waves could lap over breakwaters and coastal roads, posing risks for coastal traffic and safety near the shore.

Why this matters beyond Korea: Seoul’s air quality and weather patterns influence regional air pollution transport, which can affect nearby markets and supply chains. Korea sits at the heart of Asia-Pacific electronics manufacturing and logistics, with major ports like Incheon and Busan sensitive to weather and pollution episodes that can ripple through global supply chains and logistics planning. For U.S. readers, the forecast underscores continued exposure to East Asian environmental conditions that can affect energy demand, transportation costs, and manufacturing reliability, as well as travel and tourism flows between the United States and Korea.