South Korea is experiencing persistent high temperatures and humidity that are preventing the typical seasonal cooling expected in late August [1].
This lack of temperature drop is significant because it disrupts the traditional weather transition known as "Chuseo magic," where temperatures usually fall sharply around the Chuseo solar term. The continued heat poses ongoing challenges for public health and energy consumption as the region remains in a state of stifling humidity.
Kim Seung-bae, head of the Korea Natural Disaster Association, said that high-temperature, humid water vapor continues to flow into the country from the south [1]. This influx of moisture has maintained a "steamer-like" heat even after recent rainfall, which typically would have helped lower the ambient temperature [1].
Atmospheric conditions are further complicated by a high-pressure system stationed over Japan [1]. This system helps trap the humid air over the peninsula, ensuring that the atmosphere remains moist and heavy. According to the forecast, the solar term of Chuseo falls on Aug. 23 [1].
Usually, the arrival of Chuseo marks a turning point in the weather. However, experts said that the current atmospheric setup makes it difficult to expect the usual cooling effect this year [1]. The combination of southern vapor and the Japanese high-pressure system has created a weather block that keeps the heat locked in place.
Residents in the southern regions of the country are feeling the effects most acutely [1]. The persistence of these conditions suggests that the transition to autumn will be delayed compared to historical norms.
“High-temperature, humid water vapor continues to flow into the country from the south.”
The failure of 'Chuseo magic' indicates a disruption in traditional seasonal patterns in East Asia. When high-pressure systems over Japan synchronize with warm southern currents, it creates a humidity trap that nullifies the cooling effects of rain. This trend suggests that climate volatility is extending the duration of extreme summer heat, pushing the autumn transition further into the calendar year.
