Seoul experienced its first tropical night in nine days on Monday, with overnight temperatures remaining high as heatwave warnings expanded across South Korea [1], [3].
This return of extreme overnight heat disrupts the expected seasonal transition toward cooler weather. The persistence of high temperatures and humidity increases the risk of heat-related illness for residents in densely populated urban areas.
Weather caster Won Chae-young said the minimum temperature in Seoul remained at 25.4°C [1]. This mark ended a nine-day streak without tropical nights [1]. Daytime temperatures were expected to reach around 35°C [1].
Heatwave warnings have been expanded and strengthened across several regions [2]. These warnings currently cover Seoul, southern Gyeonggi, Sejong, Gwangju, and Daegu [5].
The weather is being driven by a strong North Pacific high-pressure system [6]. This system is maintaining high levels of temperature and humidity across the peninsula, overriding the typical effects of the seasonal transition known as Cheoseo [6].
While the heat remains oppressive, meteorologists expect showers to occur in the afternoon [2]. These rains may provide temporary relief, though the underlying high-pressure system continues to dominate the regional climate [6].
Local authorities have urged the public to remain vigilant as the heatwave warnings cover a growing portion of the country [2]. Residents in the affected regions are advised to monitor temperature alerts, and limit outdoor activity during peak heat hours [5].
“Seoul experienced its first tropical night in nine days on Monday.”
The return of tropical nights during the transition to autumn suggests a deviation from historical weather patterns in South Korea. The dominance of the North Pacific high-pressure system indicates that the region is experiencing a prolonged summer, which can strain energy grids due to increased cooling demands and impact public health through sustained thermal stress.
