On Monday the 18th, the country will be mostly clear, with clouds increasing from the night.
According to the Korea Meteorological Administration and others on the 17th, morning lows on the 18th are forecast at 12–20 C, with afternoon highs at 26–34 C.
In most regions nationwide, daytime temperatures will rise above 30 C, and around southern North Gyeongsang, the maximum heat index will climb to around 31 C, making it hot.
Waves will run 0.5–1.0 meters off the East Sea and around 0.5 meters off the West and South seas.
Wave heights in the inner offshore waters (the offshore area within about 200 kilometers of the coastline) are expected at 0.5–1.5 meters in the East and West seas and 0.5–1.0 meters in the South Sea.
Forecast lows by major city: ▲ Seoul 16 C ▲ Incheon 15 C ▲ Daejeon 15 C ▲ Gwangju 15 C ▲ Daegu 18 C ▲ Busan 18 C ▲ Ulsan 17 C ▲ Jeju 18 C.
Forecast highs: ▲ Seoul 30 C ▲ Incheon 28 C ▲ Daejeon 30 C ▲ Gwangju 32 C ▲ Daegu 34 C ▲ Busan 28 C ▲ Ulsan 32 C ▲ Jeju 25 C.