Seoul, South Korea, experienced record-breaking temperatures this month as a severe heatwave gripped the city [1].
This weather event marks a critical escalation in urban heat stress, forcing the government to trigger emergency alerts to protect residents and commuters from life-threatening conditions [1].
Thermal-infrared imagery captured the intensity of the heat across city streets, showing pedestrians and traffic struggling through the sweltering environment [1, 2, 3]. The heatwave was so intense that the city set three new all-time high temperature records within a single week [1].
The peak of the heatwave occurred on Aug. 2, 2026. Reports on the exact maximum temperature vary slightly between sources, with records indicating a peak between 42 °C and 42.5 °C [1, 2].
These conditions prompted the issuance of a severe heatwave warning. This was the first such alert issued since the warning system was introduced earlier in 2026 [1]. The system is designed to notify the public when temperatures reach levels that pose significant risks to public health and safety.
City officials and meteorological services monitored the situation as the urban landscape absorbed and radiated heat. The thermal images highlight how asphalt and concrete infrastructure contribute to the heat-island effect, a phenomenon where urban areas remain significantly warmer than surrounding rural regions [1, 2].
“The city set three new all-time high temperature records within a single week.”
The activation of the first severe heatwave warning under the new 2026 system suggests that Seoul's climate is reaching thresholds that exceed previous historical norms. The reliance on thermal imaging to document the crisis underscores the growing impact of the urban heat-island effect, where city infrastructure exacerbates extreme weather, potentially necessitating new urban planning and public health strategies to manage rising temperatures.
