A heat wave with high humidity is hitting South Korea for the fourth straight day, the Korea Meteorological Administration (KMA) said Monday.

Temperatures in Korea have soared above 33 degrees Celsius, and it didn't get much cooler overnight.

Morning lows stayed above 29 degrees in the northern maritime province of Gangwon Monday morning, with the heat stream expanding to inland regions, according to the KMA.

In an effort to avoid the heat wave, many South Koreans have headed toward beaches on the East Sea or to resorts in the alpine hills of the Daegwallyeong.

Yonhap News quoted the KMA as saying, "The air stream, moving in the southwestward direction, is getting hotter and drier as it goes over the Taebak Mountains."

The exceptionally hot, humid weather also continued in southeastern Korea. Morning lows in South Gyeongsang Province stayed above 25 degrees Celsius.

The weather agency said the heat wave will continue through early this week in eastern Korea.