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South Korea extreme summer weather: Heat, floods, and flux

Updated 36 times since CLSTR started tracking revisions of this situation.

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2026-09-07 22:33 UTC → 2026-09-09 23:49 UTC · added ~~removed~~

The extreme weather patterns of summer 2026 in South Korea have been characterized by intense heatwaves, localized heavy rainfall, and regional droughts. The Korea Meteorological Administration reported a national average temperature of 25.4 °C, the third highest since 1973. Temperatures exceeding 39 °C were recorded 42 times across 83 observation points, ~~marking the highest frequency since 2010. This included the~~ including a record 42.5 °C ~~hit~~ in Yangsan. Additionally, the national average for tropical nights reached 18.2 ~~days, nearly triple the normal level.~~ days. While overall summer precipitation was lower than average, the country faced severe localized flooding. In Geoje, rainfall reached 124.5 mm per hour, ~~with a four-day total of 968.1 mm in mid-August. Conversely,~~ while southern regions and Jeju Island experienced significant ~~droughts, with monsoon rainfall falling below half of the seasonal average.~~ droughts. By early September, weather patterns shifted toward significant temperature fluctuations and coastal warnings. Inland areas of the central and Gyeongsang provinces have seen daily temperature differences reaching approximately 15 °C. ~~While skies remain mostly clear across much~~ As of mid-September, daytime highs have reached up to 29 °C while morning lows have dropped to 11 °C, maintaining a daily gap of 10 to 15 degrees. Coastal warnings remain active due to strong winds and high waves, particularly around the ~~country, rain is anticipated in~~ Jeju coast and the ~~Gangwon~~ East ~~Coast, mountainous areas, and parts~~ Sea, where waves may reach heights of ~~the Gyeongsang and Jeju regions. High winds~~ 4 to 5 meters. Residents are advised to exercise caution regarding high swells. Furthermore, dry conditions in Seoul and ~~strong swells~~ western Gyeonggi provinces have prompted warnings for ~~coastal residents along the southern and eastern coasts. Additionally,~~ fire prevention. While air quality has remained at a ‘good’ level, morning fog in inland Gangwon and Jeonnam ~~may reduce~~ has previously reduced visibility to below 200 ~~meters, though air quality is expected to remain at a ‘good’ level nationwide.~~ meters.

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