The Korea Meteorological Administration has forecast nationwide strong rain and wind for tomorrow, May 26, 2026 [1, 4].
This sudden shift in weather follows a period of high temperatures during a public holiday, posing potential risks for coastal infrastructure and travel. The transition from heat to heavy precipitation can lead to flash flooding or wind damage in vulnerable areas.
According to the agency, a low-pressure system is approaching from the southwest [1]. This system is bringing abundant moisture into the region, which is expected to result in significant precipitation and wind across the country [1, 2, 3].
Officials specifically warned that the southern coastal region and Jeju Island will be the most affected. The Korea Meteorological Administration said that strong and heavy rain is expected to fall primarily in those areas [1].
Before the storm arrives, South Korea experienced warm weather today. In Seoul, the temperature was recorded at 27.6°C during the broadcast [5], with a projected daytime high of 30°C [6]. Other major cities saw similar heat, with Daejeon projected to reach 29°C [7] and Daegu projected to reach 28°C [8].
An anchor for YTN said that many areas continued to experience daytime heat around 30°C today, which was a substitute holiday [1]. The broadcaster said that strong rain and wind were predicted to arrive immediately after the holiday period ended [1].
“Strong and heavy rain is expected to fall primarily in those areas.”
The rapid transition from a high-pressure heatwave to a low-pressure storm system increases the risk of severe weather volatility. For the southern coast and Jeju Island, the combination of abundant moisture and strong winds suggests a higher probability of localized flooding and maritime disruptions compared to the northern regions.
