The Korea Meteorological Administration announced that the summer monsoon season began in Jeju on June 30 [1].
This arrival marks the start of a period of heavy precipitation that could lead to flooding and landslides in vulnerable mountainous areas. The timing and intensity of the monsoon are critical for agricultural planning and disaster prevention across the southern peninsula.
Officials said the monsoon began as a stationary front moved north, bringing light rain to parts of the island [1, 2]. The weather agency has issued warnings for the Jeju mountain regions, where rainfall is expected to exceed 180 mm [1].
"The Korea Meteorological Administration has judged this rain to be the start of the Jeju monsoon," the agency said [1].
Forecasters expect the weather system to expand further. The agency said the monsoon is expected to expand to the southern regions of South Korea by early tomorrow, July 1 [1, 2].
Reporter Kim Min-kyung of YTN News said that light rain is currently falling in some areas of Jeju as the stationary front gradually moves north [2]. Local authorities are monitoring the situation closely to ensure the safety of residents in the path of the advancing front.
"Tomorrow dawn, the monsoon is expected to expand to the southern regions," the Korea Meteorological Administration said [1].
“Rainfall is expected to exceed 180 mm in the Jeju mountain regions.”
The onset of the monsoon in Jeju serves as the primary indicator for the seasonal weather shift in South Korea. Because the stationary front is moving north toward the southern mainland, local governments must now activate emergency protocols for flood management, and infrastructure stability to mitigate the risks associated with high-volume precipitation.
