[Weather Tomorrow] Nationwide Heatwave and Tropical Nights Ease... Daytime Highs Up To 33°C

Double Heat Dome Eases as Typhoon Dolphin Passes
Temperature Levels to Remain Steady Until National Liberation Day

On Wednesday, August 12, most regions across the country are forecast to escape from the heatwave and tropical nights. On August 12, the morning low temperatures nationwide are expected to range between 17 and 24 degrees Celsius, while the daytime highs will likely be between 25 and 33 degrees Celsius.

According to the Korea Meteorological Administration on August 11, the forecast minimum and maximum temperatures for major cities are as follows: Seoul 22 and 32 degrees, Incheon 22 and 33 degrees, Daejeon 19 and 31 degrees, Gwangju 21 and 32 degrees, Daegu 20 and 31 degrees, Ulsan 22 and 29 degrees, and Busan 23 and 31 degrees.

As Ipchu passed, the feeling of the morning and evening breeze changed. Having endured a heatwave of 40 degrees Celsius, the 30-degree morning breeze felt even cool as citizens wearing light long sleeves moved along Sejong-daero in Seoul on August 10, 2026. Photo by Cho Yongjun

Given that the standard for a tropical night is a minimum nighttime temperature of 25 degrees Celsius or above, and a heatwave day requires a maximum temperature of at least 33 degrees Celsius, it is expected that most parts of the country will not experience tropical nights or heatwaves.

The heatwave advisory, which is issued based on perceived temperature, has now been lifted everywhere except for some areas in Gyeonggi Province, such as Yeoju Southeast, Yeoju West, Gimpo, Hwaseong, and Southern Paju. A heatwave advisory is issued when the daily maximum perceived temperature of 33 degrees Celsius or higher is expected to continue for two or more days.

The so-called "double heat dome" situation, where both the Tibetan High and North Pacific High overlapped to blanket the country, has now been resolved as Typhoon Dolphin (No. 13) passed south of Korea, destabilizing the surrounding pressure systems. In addition, dry air descending from a low-pressure system stationed northeast of Korea formed a high-pressure area, and relatively cool and dry northeasterly winds blowing along the edge of this high-pressure system further eased the heatwave.

It is expected that current temperature levels will be maintained until National Liberation Day on August 15. For August 13, the morning lows are forecast to be between 19 and 24 degrees Celsius and highs between 27 and 34 degrees, for August 14, lows of 20 to 24 degrees and highs of 27 to 34 degrees, and for August 15, lows of 21 to 25 degrees and highs of 28 to 33 degrees are forecast.

Due to the effect of the northeasterly wind, rain is expected to begin on the East Coast and mountainous areas of Gangwon Province from the morning of August 12, and on the East Coast and northeastern mountainous areas of North Gyeongsang Province from the afternoon. On the afternoon of August 13, rain will also start falling in the coastal and eastern inland areas of South Gyeongsang Province. The expected precipitation is 20 to 60 mm for the East Coast and mountainous areas of Gangwon and the northern East Coast and northeastern mountainous areas of North Gyeongsang Province, and 10 to 40 mm for the southern East Coast of North Gyeongsang, as well as Busan, Ulsan, the southern coast and eastern inland areas of South Gyeongsang Province, Ulleungdo, and Dokdo.

Swell waves will continue to strongly affect the coasts of South Jeolla, Jeju, South Gyeongsang, and the East Coast. Starting August 12, the gravitational pull of the moon will cause the sea level to be higher than usual, so precautions should be taken to prevent flooding in low-lying coastal areas.

This content was produced with the assistance of AI translation services.