The Korea Meteorological Administration (KMA) said the warning covers most of the capital, affecting 19 of the city's 25 districts, while an existing lower-level advisory remains in effect in northwestern Seoul.
A heatwave advisory is issued when the daily maximum temperature is expected to reach at least 33 degrees Celsius for two or more consecutive days, while a higher-level heatwave warning is issued when the temperature is forecast to exceed 35 degrees.
Health authorities warned that heat-related illnesses are likely to rise sharply in the coming weeks as sweltering heat sets in with the end of the monsoon season.
According to the Korea Disease Control and Prevention Agency (KDCA), the cumulative number of heat-related illness cases this year reached 1,482 as of early this week, with nine deaths reported nationwide including three in South Gyeongsang Province, two each in Gangwon Province and Seoul, and one each in Jeju and North Jeolla Province.
Heat-related illnesses have been on the rise since last week, averaging around 60 cases per day before climbing to around 80 cases over the weekend.
Health officials have urged the public to avoid unnecessary outdoor activities, stay well hydrated, and take frequent breaks during periods of extreme heat.
In response to the prolonged heatwave, the Seoul Metropolitan Government has also strengthened safety measures for outdoor workers and vulnerable residents. The city government is providing cooling shelters and heat-relief spaces while conducting regular checks on older residents living alone through phone calls and home visits.
"We will make the safety and lives of citizens our top priority and take all necessary measures to prevent heatwave-related casualties," said Choi Jin-seok, a senior city official.
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