People visit Eurwang-ri Beach in Jung District, Incheon, Aug. 11. Yonhap

The tropical night phenomenon has continued in Seoul for 22 days in a row, the third longest on record, the state weather agency said Monday.

Seoul has experienced yet another tropical night phenomenon overnight, marking the third longest on record since modern meteorological observation began in the city in 1907, the Korea Meteorological Administration (KMA) said.

A tropical night refers to a phenomenon when the nighttime temperatures stay above 25 degrees Celsius from 6:01 p.m. to 9 a.m. the following day.

The cities of Incheon and Busan also experienced the tropical night phenomenon for 20 days and 18 days in a row, respectively.

It marks the third-longest record of tropical nights in Incheon since 1904, and the fifth in Busan.

The heat wave will continue throughout Monday in most regions, with apparent temperatures rising to about 35 degrees.

As of 8 a.m., the temperatures in major cities recorded 29.3 degrees in Seoul, 29.7 degrees in Incheon, 29 degrees in Daejeon, 27.5 degrees in Gwangju and 28.8 degrees in Busan.

The daily highs are forecast to hover around 30-35 degrees.

The KMA expects the heat wave to continue for the time being, adding the temperatures from Thursday to Aug. 22 will be higher than normal years, with the morning temperatures ranging from 23-27 degrees, and daytime temperatures from 30-34 degrees.

Many parts of the country, including the greater Seoul area, parts of Gangwon Province and Chungcheong Province, will see sporadic showers from the afternoon until nighttime.

The eastern Gyeonggi Province and parts of Gangwon Province are expected to receive 5-40 millimeters of rain, and the rest of the region will see 5-20 mm of rain during this time, according to the KMA. (Yonhap)