The Korea Meteorological Administration expanded heat-wave warnings to parts of the capital region on Thursday, forecasting daytime heat indices around 33 °C [1].
The expansion follows the first heat-wave warnings of the summer in the Yeongnam region, signaling an early and aggressive start to the seasonal heat. This shift increases the risk of heat-related illnesses for residents in densely populated areas near Seoul.
The updated warnings became effective at 11 a.m. local time on June 18, 2026 [4]. The specific areas added to the warning list include the Gyeonggi-do cities of Hanam and Yeoju [5]. These regions join earlier warning areas in the Yeongnam region, including Daegu-Gunwi, Gyeongsan, and Yecheon.
Forecasters expect Seoul to reach a daytime temperature of 32 °C [2]. Most of the country is predicted to see daytime temperatures above 30 °C [3]. A persistent high-pressure system is driving these temperatures upward by creating clear skies and strong sunshine.
The Korea Meteorological Administration said the risk of heat-related illness would grow as the highest perceived temperatures hit 33 °C or more today and tomorrow [1]. The agency urged the public to be particularly cautious to avoid health complications.
"Yesterday, the first heat-wave warning of this summer was issued for the Yeongnam region, and today the heat-wave warning has been expanded to some areas of the capital region," an anchor for YTN said.
“The Korea Meteorological Administration expanded heat-wave warnings to parts of the capital region.”
The expansion of heat-wave warnings into the capital region, combined with the earlier alerts in the Yeongnam region, indicates a broad geographical spread of extreme heat early in the summer. By focusing on the heat index—which accounts for humidity—rather than just ambient temperature, the Korea Meteorological Administration is highlighting the increased physiological strain on the human body, necessitating public health interventions to prevent heatstroke in urban centers.
