Such an advisory is issued when the highest temperature is expected to reach 35 degrees Celsius or higher for two or more consecutive days.
Although "Baekro," which heralds the season when chilly morning dew starts to form and is often considered the beginning of autumn according to the lunar calendar, just passed last week, but there seem to be no signs of the summer heat abating.
According to the Korea Meteorological Administration (KMA), Wednesday's highest temperature in Seoul hovered around 35 degrees Celsius, following the previous day's 33.9 degrees Celsius, which was a record daytime high for September since relevant statistics began in 1907.
The previous record of 35.1 degrees Celsius was set in September 1939. Temperatures for early September in Seoul typically stands around 27 degrees.
In addition to the scorching daytime temperatures, Seoul experienced tropical nights for two consecutive days. A tropical night is defined as a night when the lowest temperature does not drop below 25 degrees Celsius after dark.
But typhoon Bebinca, which formed near Guam early this week, is forecast to strengthen into a severe tropical storm and head toward China but may still affect the Korean Peninsula, bringing rain on Thursday and Friday, which is expected to slightly alleviate the sweltering heat.