Weather Forecast: Nationwide Rain and Heat Wave Expected

By SEOYOUNG LEE Posted : July 19, 2026, 20:48 Updated : July 19, 2026, 20:48

On Monday, July 20, a stationary front will bring rainy weather across the country. Heavy rain, accompanied by strong winds and thunderstorms, is expected mainly in the central regions, while heat will continue in the Chungcheong and southern areas.

According to the Korea Meteorological Administration, rain will begin in most parts of the country on the morning of July 20. However, some areas in the southern regions, including South Gyeongsang and Jeju Island, may experience temporary breaks in the rain.

Expected rainfall amounts are 20 to 80 mm in Daejeon, Sejong, South Chungcheong, and North Chungcheong, and 20 to 60 mm in Seoul, Incheon, Gyeonggi, inland and mountainous areas of Gangwon, North Jeolla, and northern parts of North Gyeongsang. In Gwangju, South Jeolla, Daegu, southern North Gyeongsang, and South Gyeongsang, rainfall of 5 to 40 mm is anticipated. The five western islands, Ulleungdo, Dokdo, and Jeju Island are also expected to receive 5 to 20 mm of rain.

In areas experiencing rain, there is a risk of concentrated downpours that could lead to river flooding, lowland inundation, and landslides. Given the recent heavy rainfall, caution is advised near forests and steep slopes.

Despite the rain, the heat will persist. Heat advisories are in effect for parts of Chungcheong and the southern regions, with the maximum perceived temperatures across most areas expected to reach around 31 degrees Celsius. In regions under heat advisories, the perceived temperature could soar to around 33 degrees, while Jeju Island may see temperatures rise to about 35 degrees.

Morning low temperatures are forecasted to be between 22 and 26 degrees, with daytime highs ranging from 26 to 33 degrees. Major cities are expected to see daytime highs of 28 degrees in Seoul and Incheon, 30 degrees in Chuncheon, 31 degrees in Daejeon and Cheongju, and 32 degrees in Gwangju, Jeonju, and Ulsan, with Daegu and Jeju reaching 33 degrees.

Along the southern coast, South Gyeongsang, and Jeju Island, some areas may experience tropical nights with temperatures not dropping below 25 degrees.

Fog is expected over the southern waters of the West Sea, the South Sea, the waters around Jeju Island, and the southern waters of the East Sea. Some island regions and mountainous areas in Gangwon may experience dense fog with visibility below 200 meters, necessitating caution for transportation and maritime safety.

Fine dust levels are expected to be at 'good' to 'moderate' levels nationwide.





* This article has been translated by AI.

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