Scattered rain will continue tonight across central South Korea and southern inland regions before typical early-summer weather returns tomorrow [1, 2].

This weather shift follows a period of significant temperature volatility and heavy precipitation in several provinces, impacting ground stability and local temperatures.

In Seoul, the rain has mostly subsided, according to YTN weather caster Lee Hye-min. The city experienced a sharp temperature drop, falling to approximately 21 °C [1]. Lee said that temperatures in the capital decreased by more than 10 °C in a single day [1].

While the capital area is expected to see less than five mm of rainfall tonight [2], other regions have faced more severe conditions. Heavy rain measuring between 100 and 200 mm has already fallen in Gangwon and Gyeongbuk provinces [1]. This volume of precipitation has weakened the ground in those areas, increasing the risk of instability.

Forecasts indicate that northern Gangwon and the east coast may receive an additional 20 to 60 mm of rain by tomorrow morning [2]. Despite these localized showers, the broader weather system is transitioning toward a more stable pattern.

Tomorrow, June 21, the region is expected to see clearer skies and warmer temperatures. This transition marks the return of typical early-summer conditions for the peninsula [1, 2].

“Seoul temperature fell to about 21 °C, a drop of more than 10 °C in one day”

The rapid temperature drop in Seoul and heavy rainfall in the east highlight the volatility of South Korea's seasonal transition. The saturation of soil in Gangwon and Gyeongbuk provinces is particularly significant, as weakened ground can increase the likelihood of landslides or infrastructure failures even if subsequent rainfall is moderate.