South Korea has issued a nationwide tropical night warning as heavy rain is expected to persist through July 14, 2026 [1].

The combination of extreme humidity and high overnight temperatures creates a public health risk, while the forecasted rainfall threatens to cause flooding in vulnerable regions.

Weather officials said most of the country is under the tropical night alert [1]. This phenomenon occurs when the minimum temperature remains high during the night, preventing the environment from cooling down and increasing the risk of heat-related illnesses for the population.

Heavy rain is expected to impact the majority of the peninsula [1]. Forecasters said there are specific risks for the mountainous areas of Jeju, as well as the southern and eastern coasts, where the terrain can exacerbate the effects of intense precipitation [1].

Authorities are monitoring the situation as the rainy season continues to bring volatile weather patterns to the region [1]. Residents in the affected coastal and mountainous zones are advised to remain vigilant for flash floods and landslides, which often accompany these heavy rain events.

While the tropical night warning covers most of the country, the intensity of the rainfall varies by region [1]. The forecast indicates that the moisture-laden air will continue to fuel precipitation through tomorrow, maintaining the current high-humidity conditions across the mainland and the islands [1].

“South Korea has issued a nationwide tropical night warning”

The simultaneous occurrence of tropical nights and heavy monsoon rains creates a compounding stressor on South Korea's urban infrastructure and public health systems. High overnight temperatures prevent the body from recovering from daytime heat, while persistent rain increases the risk of landslides in mountainous regions like Jeju, necessitating a coordinated emergency response across both health and disaster management sectors.