Tomorrow’s Weather Forecast: A Chill Returns to Korea

Seoul, South Korea – March 18, 2026 – A return to colder temperatures is anticipated for Thursday, March 19th, bringing a noticeable chill across the Korean peninsula. Expect a significant temperature swing between day and night, around 15°C (59°F), so dressing in layers is highly recommended to stay comfortable and healthy.

The skies will be partly cloudy nationwide. Air quality is expected to be ‘poor’ in the Seoul metropolitan area, Gangwon Yeongseo, and Chungnam provinces, while the rest of the country will experience ‘moderate’ levels. You can find more detailed air quality information at AirKorea.

Temperature Outlook

Morning lows are forecast to range between -4°C (25°F) and 6°C (43°F), while daytime highs will reach 8°C (46°F) to 17°C (63°F). These temperatures are similar to, or slightly lower than, the average for this time of year.

Inland areas can expect temperatures to drop below freezing overnight, potentially leading to frost formation. Be cautious of slippery conditions during the early morning hours.

Strong Winds and Sea Conditions

Strong winds, with gusts up to 55 km/h (34 mph or 15 m/s), are expected along the Gangwon mountains and the east coast starting in the early morning. Secure outdoor objects and exercise caution when traveling in these areas.

Sea conditions will be moderate. Waves in the East and West Seas will range from 0.5 to 2.0 meters (1.6 to 6.6 feet), while the South Sea will see waves between 0.5 and 1.5 meters (1.6 to 4.9 feet). The outer seas will experience waves of 1.0 to 2.0 meters (3.3 to 6.6 feet) in the East Sea and 0.5 to 2.5 meters (1.6 to 8.2 feet) in the West and South Seas.

Regional Weather Forecast (March 19th)

• Seoul: [Clear, Partly Cloudy] (1-11°C) <0, 20%>
• Incheon: [Clear, Partly Cloudy] (1-8°C) <0, 20%>
• Suwon: [Clear, Partly Cloudy] (0-10°C) <0, 20%>
• Chuncheon: [Clear, Partly Cloudy] (-3-12°C) <0, 20%>
• Gangneung: [Clear, Partly Cloudy] (4-13°C) <0, 20%>
• Cheongju: [Partly Cloudy, Partly Cloudy] (2-13°C) <20, 20%>
• Daejeon: [Partly Cloudy, Clear] (1-13°C) <20, 10%>
• Sejong: [Partly Cloudy, Partly Cloudy] (0-13°C) <20, 20%>
• Jeonju: [Partly Cloudy, Clear] (1-13°C) <20, 10%>
• Gwangju: [Clear, Clear] (2-14°C) <0, 10%>
• Daegu: [Clear, Clear] (3-15°C) <0, 10%>
• Busan: [Clear, Partly Cloudy] (6-16°C) <0, 20%>
• Ulsan: [Clear, Partly Cloudy] (4-15°C) <0, 20%>
• Changwon: [Clear, Clear] (5-16°C) <0, 10%>
• Jeju: [Partly Cloudy, Clear] (6-12°C) <20, 10%>

This article was created with the assistance of artificial intelligence (AI) technology. A draft written by AI was reviewed and finalized by a reporter based on data from the Korea Meteorological Administration and further reporting. The original weather forecast data from the Korea Meteorological Administration can be found on their website: Korea Meteorological Administration.