South Korea Weekend Weather: Snow, Frost, Coastal Swells; Impacts U.S. Supply Chains

Daegwallyeong Pass in Gangwon Province, a high mountain route known for heavy snowfall, is blanketed in white as mid-March weather sets the scene for a weekend of cloudy skies across South Korea.

Forecasters say Saturday and Sunday will be largely cloudy nationwide, with a mild but variable temperature profile that could prompt noticeable day-to-night swings.

In Seoul, the morning is expected to start around 3°C, rising to about 12°C by the afternoon, illustrating a relatively warm daytime but a sharp contrast from early morning to midday.

The weekend outlook also calls for caution on the coast, as frost or fog may form in the southern inland areas tomorrow morning, and strong swells are forecast along the East Coast and Jeju Island, potentially affecting coastal travel and safety.

Tomorrow morning’s temperatures include 3°C in Seoul and -2°C in Chuncheon, with Seoul rising to 12°C by the afternoon and cities like Gwangju and Daegu reaching about 15°C.

Public health officials urge vigilance about the large diurnal temperature range, as such swings can pose risks for respiratory and cardiovascular health, especially among the elderly and those with existing conditions.

Looking ahead to midweek next week, rainfall is forecast for the Chungcheong region and Jeju, a pattern that could impact domestic travel and logistics across central and southern Korea.

Why this matters for the United States: South Korea is a major hub for global electronics and automotive supply chains, with key manufacturing and export hubs in and around Seoul, Busan, and Jeju. Weather-driven disruptions—whether frost, fog, heavy snow at mountain passes, or coastal swells—can affect trucking routes, air and port operations, and just-in-time shipments that feed global markets, including the U.S. semiconductor, smartphone, and auto sectors. The forecast for rain in Chungcheong and Jeju next week could also influence domestic travel and logistics that support international suppliers and customers. For U.S. readers with ties to Korean suppliers or markets, monitoring these patterns helps assess near-term risk to production schedules, delivery timelines, and consumer demand that ripple through global supply chains.