South Korea Declares National Disaster as Record-Breaking Heatwave Kills at Least 19

South Korea is battling a historic heatwave that has claimed at least 19 lives and left over 2,000 people ill, prompting President Lee Jae-myung to declare a national disaster. Temperatures reached a 122-year record of 42.5°C in Yangsan, while Seoul issued its first-ever severe heat warning. In response, authorities have deployed water-spraying trucks, initiated health checks for 63,000 vulnerable residents, and ordered power grid inspections as air conditioning demand surges.

Record-breaking South Korea heatwave

• ▪The Korea Meteorological Administration issued its first-ever severe heatwave warning for the entire capital city of Seoul on August 4, 2026.
• ▪South Korea recorded its highest temperature in 122 years of weather observations when Yangsan reached 42.5 degrees Celsius on August 2, 2026.

Heat-related deaths and illnesses

• ▪At least 2,025 people in South Korea suffered heat-related illnesses between May 15 and August 2, 2026.
• ▪The ongoing heatwave in South Korea has resulted in at least 19 deaths, including 13 individuals aged 80 or above.

Government emergency response measures

• ▪Seoul authorities deployed 200 trucks to spray water across 2,000 kilometers of roads and sent nurses to check on 63,000 vulnerable residents.
• ▪South Korean President Lee Jae-myung declared the heatwave a national disaster and ordered a fundamental overhaul of the national crisis response system.

Meteorological causes of heat

• ▪The foehn phenomenon, where air warms and dries as it descends mountain ranges, intensified the heat in South Korea's southeastern region.
• ▪The Korea Meteorological Administration attributed the heatwave to overlapping high-pressure systems over the Korean peninsula combined with strong, direct sunlight.

Typhoon Dolphin potential impact

• ▪Typhoon Dolphin was moving west toward Okinawa on August 3, 2026, and was expected to weaken to a category one or two storm.
• ▪Typhoon Dolphin could worsen the heatwave by raising humidity if it tracks toward eastern China, or bring cooling rain if it passes closer to the southern peninsula.

Climate change extreme weather

• ▪Scientists state that extreme weather events like heatwaves are becoming more frequent and intense globally due to human-induced climate change.
• ▪The annual number of days in South Korea reaching at least 33 degrees Celsius has more than doubled over the past five years to 19 days.