On the 20th, also known as the Grain Rain (곡우), when the spring rain that enriches the grains falls, the weather will be mostly cloudy nationwide, with rain expected until the afternoon, followed by clearer skies. The highest daytime temperature will rise to 27 degrees, causing a notable temperature difference.

On the morning of the 14th, a citizen moves with their head covered by a bag at the Gwanghwamun intersection in Jongno-gu, Seoul. /Courtesy of News1

According to the Korea Meteorological Administration, rain will continue until early morning, and the central region will have occasional clouds before gradually clearing up in the afternoon. The southern region and Jeju Island are forecasted to be mostly cloudy, with occasional clouds appearing in the afternoon.

The temperature difference in the inland central region is expected to be around 15 degrees. The Korea Meteorological Administration noted, "Attention should be paid to health management."

In southern Gangwon, the Chungcheong region, southern provinces, and Jeju Island, rain is expected from early morning. Some areas in the Gyeongsang region will experience rain until noon. Additionally, strong winds are forecasted in most parts of the country until early morning.

The morning low temperatures will be between 7 and 16 degrees, while the highest daytime temperatures will range from 15 to 27 degrees.

The morning low temperatures in major regions will be as follows: Seoul 11 degrees, Incheon 9 degrees, Suwon 10 degrees, Chuncheon 9 degrees, Gangneung 10 degrees, Cheongju 12 degrees, Daejeon 12 degrees, Jeonju 15 degrees, Gwangju 16 degrees, Daegu 16 degrees, Busan 16 degrees, and Jeju 16 degrees.

The highest daytime temperatures will be as follows: Seoul 23 degrees, Incheon 20 degrees, Suwon 23 degrees, Chuncheon 24 degrees, Gangneung 17 degrees, Cheongju 25 degrees, Daejeon 25 degrees, Jeonju 25 degrees, Gwangju 27 degrees, Daegu 21 degrees, Busan 18 degrees, and Jeju 22 degrees.

The concentration of fine dust is expected to range from "good" to "moderate" nationwide due to smooth atmospheric diffusion.

Ocean waves are expected to reach 0.5 to 1.5 meters in the East Sea and South Sea, and 0.5 to 1.0 meters in the West Sea.