South Korea Forecasts Extreme Rain and Wind Nationwide

South Korea expects nationwide strong rain and wind on May 26, 2026, with extreme rainfall forecast for Jeju Island and the southern coast ^[1].

These weather conditions pose a significant risk of flooding and landslides, particularly in mountainous areas and coastal regions where rainfall intensity is expected to be highest.

A low-pressure system moving in from the southwest is drawing hot, humid air over the Korean Peninsula ^[3]. This atmospheric shift is generating strong winds, heavy rain, and thunderstorms across the country ^[3].

Weather officials have issued heavy-rain warnings for Jeju Island and the southern coastal region, including South Jeolla Province and nearby counties [1, 2]. In these areas, hourly rainfall intensity could reach up to 50 mm ^[1].

Total rainfall accumulations by tomorrow are expected to be severe. Jeju's mountainous areas may see 250 mm or more ^[1], while the southern coastal region is forecast to receive 150 mm or more ^[1]. Other regions, including Seoul and Daegu, are expected to see maximum rainfall of up to 80 mm ^[1].

At the time of reporting, temperatures remained mild. Seoul recorded 21.8 °C ^[4] and Daegu recorded 20 °C ^[4].

Local authorities are monitoring the situation as the humid air continues to fuel the storm system. Residents in the most affected zones have been advised to prepare for potential disruptions caused by the extreme hourly downpours ^[1].