South Korea is experiencing a nationwide heat wave with temperatures reaching as high as 37°C in Pohang [3].

The extreme weather patterns pose significant health risks to residents and disrupt daily activity across major urban centers and rural provinces. This combination of oppressive heat and erratic precipitation is driven by a stationary front moving across the peninsula.

In Seoul, temperatures were reported at 23.3°C during early morning reporting [1], though other reports indicated levels over 30°C [8]. The midday projection for the capital city reached 32°C [2], marking a six-degree increase from the previous day.

"Currently, the temperature in Seoul is 23.3 degrees, and it will rise to 32 degrees during the day, which is 6 degrees higher than yesterday," a YTN weather reporter said.

The heat is most severe in coastal and southern cities. In Pohang, where heat-wave warnings remain active, temperatures are expected to hit 37°C [3]. In Daegu, temperatures were noted just above 26°C in some reports [6], while other forecasts projected a midday peak of 35°C [7].

"Pohang, where 'heat wave warnings' continue, will soar to 37 degrees, which is higher than human body temperature," the reporter said.

While the heat dominates the north, a stationary front is triggering seasonal "jang-mat-bi" showers in the south. Rain began in Honam and Jeju Island during the morning hours before expanding to the Chungcheong-Nam region in the afternoon [10].

Forecasts for rainfall vary by region. Jeju Island is expected to see a maximum of 30 mm [4], while other southern areas could receive up to 80 mm [5].

"Due to the influence of the stationary front, the rainy season rain started in Honam and Jeju Island in the morning, and it will expand to the Chungcheong region in the afternoon and to other southern regions overnight," the reporter said.

Authorities have issued both heat-wave and tropical-night warnings to alert the public to the prolonged high temperatures [11].

“Pohang, where 'heat wave warnings' continue, will soar to 37 degrees, which is higher than human body temperature.”

The simultaneous occurrence of extreme heat and the 'jang-mat' rainy season indicates a volatile atmospheric environment. When a stationary front lingers, it traps heat and moisture, creating a cycle of high humidity and temperature spikes that increase the risk of heatstroke and urban flooding. This pattern complicates disaster management for South Korean authorities who must address both heat-related casualties and flash flood risks in the southern provinces.