Yangsan, a city in South Gyeongsang Province, recorded a daytime high of 42.5°C [1], marking the highest temperature ever observed in South Korea [3].

This record-breaking heat signals a dangerous escalation in regional weather patterns, placing immense pressure on public health infrastructure and energy grids during the summer peak.

Meteorologists said the extreme spike was due to a combination of a heat dome and the city's specific geographic basin effect [2]. These factors trapped hot air over the region, preventing cooling and causing temperatures to climb to unprecedented levels. The city has now experienced five consecutive days with temperatures exceeding 40°C [1].

Local residents described the conditions as the most severe they have ever experienced. Kim Jun-seok, a resident of Jungbu-dong in Yangsan, said he has never seen temperatures reach 42°C and noted that sweat begins to form on the body almost immediately after bathing.

According to YTN, the daytime high of 42.5°C is the first time such a temperature has been recorded in the history of domestic meteorological observations [3]. The persistent nature of the heat, staying above 40°C for nearly a week, has intensified concerns regarding heat-related illnesses in the province.

Authorities are monitoring the situation as the heat dome continues to influence the peninsula. The combination of the basin geography and the atmospheric pressure system has created a localized environment where heat accumulates more aggressively than in coastal or mountainous areas [2].

“Yangsan recorded a daytime high of 42.5°C, marking the highest temperature ever observed in South Korea.”

The occurrence of a 42.5°C peak suggests that South Korea's climate is reaching new extremes that exceed previous historical benchmarks. The synergy between a regional heat dome and local basin geography creates 'heat traps' that make certain urban centers significantly more vulnerable than others, necessitating more localized and aggressive cooling strategies for public safety.