On Sunday, showers will fall in many areas across the country except the southern regions. The daytime high will range from 25 to 31 degrees Celsius, making it muggy, and rain will intensify from afternoon into evening.
The Korea Meteorological Administration forecast showers from afternoon to evening in the central regions, excluding the East Coast and mountainous areas of Gangwon, as well as in North Jeolla, northern South Jeolla, and the inland western parts of Gyeongsang. In southeastern Gyeonggi and the inland areas of southern Gangwon, rain may continue until late at night.
Expected rainfall totals are 5 to 50 mm in the Seoul metropolitan area, Chungcheong, and Jeolla regions, and 5 to 30 mm in inland Gangwon and inland North Gyeongsang. Some parts of the Seoul metropolitan area may see heavy rain at around 20 mm per hour. Because these are localized showers concentrated in narrow areas, there will be significant differences even within the same region.
Morning lows are expected to range from 14 to 20 degrees Celsius, and afternoon highs from 25 to 31 degrees Celsius. Seoul, Daejeon, and Cheongju are forecast to reach 29 degrees, Jeonju 30 degrees, and Daegu 31 degrees, making inland areas particularly hot. Gangneung will see 27 degrees, while Busan and Jeju will reach 26 degrees. Fine dust levels are expected to remain between “good” and “moderate” nationwide. Sea waves will be 0.5 to 1.5 meters in the East and South Seas and 0.5 to 1.0 meters in the West Sea.
Because rain is concentrated in the afternoon, it is best to finish outdoor plans in the morning. Morning activities should not be difficult, as sunshine will be good and fine dust levels low. It is safer to wrap up outings, exercise, and hiking early, and to reschedule camping or water activities.
It is better to postpone car washing and laundry. Even if they are finished in the morning, they can easily get wet or dirty again in the afternoon rain. Laundry is safer if dried indoors or in a dryer, and blankets and flowerpots left outside should be brought in beforehand.
When going out, it is advisable to carry a foldable umbrella and wear shoes with good traction to prevent slipping. Drivers should make sure windows and sunroofs are closed and, if possible, avoid parking on low-lying streets.
When heavy showers occur, driving visibility worsens and roads become slippery. Drivers should reduce speed and leave more distance than usual from the vehicle ahead. It is safer to turn on headlights, and to avoid sudden braking and abrupt lane changes. Low-lying roads and underpasses can fill with water quickly, so taking alternative routes is advisable.
Pedestrians also need to be careful. Watch out for manholes, drains, and puddles hidden by rainwater, and be cautious about slipping on stairs and crosswalks. In mountainous areas, stream water can rise suddenly, so if rain is forecast, it is better to come down early.
Heat management is also important. Even with rain, humidity will remain high and the heat will continue, so drinking water frequently is recommended. Food left at room temperature can spoil easily, so storage requires care, and on days with large indoor-outdoor temperature differences, wearing a light outer layer is advisable to prevent air-conditioning sickness.
The time when showers stop will vary by region. It is best to check local weather information before going out.