The Korea Meteorological Administration (KMA) issued the advisory for the capital at noon, about 11 days later than last year.
Such an advisory is issued when daytime highs soared over 33 degrees Celsius and are expected to persist for two days or longer.
According to the KMA, the advisory came after the capital sweltered through its first tropical night, when the mercury did not drop below 25 degrees at night.
Similar heat advisories were also issued for most parts of the country including neighboring Gyeonggi Province, Gangwon Province, and southern provinces, as sizzling heat gripped the nation, with daytime highs soaring between 27 and 35 degrees.
"The scorching heat along with lingering humidity is expected to persist for a while, although sporadic showers will temporarily abate a little in some areas," the KMA warned.
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