August 15 Weather: Liberation Day Showers in Central Korea, Rain in the South From Afternoon—When Will You Need an Umbrella?
On 2026-08-15, Liberation Day, mostly cloudy skies with rain or showers are expected across South Korea. However, rain will not begin everywhere at the same time. Central regions may experience showers during the day, while more widespread rain is expected to begin in southern regions in the afternoon and spread to additional areas at night.
Daytime temperatures nationwide are expected to reach around 27–33°C. Rather than assuming that rain will bring cool weather, it is better to prepare for both intense heat and sudden rainfall.
August 15 Nationwide Weather: It Will Not Rain All Day Everywhere
On Liberation Day, 15, skies are expected to be mostly cloudy across the country. The timing and type of precipitation will vary considerably by region.
Rain is expected to continue on Jeju Island, while precipitation is likely to begin in the Jeonnam and Gyeongnam regions during the afternoon. By nighttime, rain is expected to spread to southern Chungcheong, Jeonbuk, and the Gyeongbuk region.
The pattern will be somewhat different in central regions, including Seoul, Incheon, and Gyeonggi Province. Light raindrops may fall in some locations between dawn and morning, while localized showers may develop during the day.
Therefore, describing the weather on 15 simply as 'rain nationwide' may not accurately reflect the conditions people encounter when going out. The key is to prepare for sudden showers in central Korea and rain that gradually spreads across southern Korea from the afternoon onward.
Seoul, Gyeonggi, and Other Central Regions Should Prepare for Showers
In Seoul, Incheon, and Gyeonggi Province, the main uncertainty on Liberation Day is the possibility of showers rather than continuous rainfall throughout the day. Even within the Seoul metropolitan area, one location may experience rain while another nearby location remains dry.
Because showers can develop rapidly and become intense over a small area, a dry morning does not necessarily mean it is safe to leave home without an umbrella.
Showers are expected between morning and nighttime in central regions and the central and northern inland areas of Gyeongbuk. Forecast rainfall from showers in Seoul, Incheon, Gyeonggi, inland and mountainous areas of Gangwon, and the Chungcheong region was generally estimated at 5–50 mm.
The wide range of forecast rainfall is also important. Showers can vary significantly by location, meaning neighboring areas may receive substantially different amounts of rain.
If you are planning to attend a Liberation Day event or spend time outdoors in the Seoul metropolitan area, it is safer to carry a compact umbrella and check the hourly forecast again immediately before leaving.
Rain Will Begin in Southern Korea in the Afternoon and Continue Through 16
Unlike the showers expected in central Korea, an increasing number of southern areas will come under the influence of more widespread rain clouds beginning in the afternoon. Some locations, particularly along the southern coast and around Mount Jirisan, may receive heavy rainfall through 16.
On the afternoon of 15, rain is expected to begin in Jeonnam and Gyeongnam before expanding into Jeonbuk, Gyeongbuk, and other areas at night. By 16, rainfall is forecast to spread across most of the country.
Therefore, if you are planning a long-distance trip or outdoor activities in southern Korea, it is more important to check what time rain will begin in the specific areas you will travel through than simply whether rain is forecast for 15.
Heavy rainfall may be concentrated in areas influenced by mountainous terrain, particularly the southern coast, the Mount Jirisan area, and the mountains of Jeju Island. Some locations may also experience gusty winds, thunder, and lightning, so anyone planning activities near valleys or rivers should monitor rainfall conditions more frequently.
In areas experiencing heavier rain, it is also important to consider the possibility of flooded roads and water accumulating in low-lying areas.
Jeju Island Also Needs to Prepare for Rain on Liberation Day
Rain is expected on Jeju Island on 15, with the possibility of substantially higher rainfall totals in mountainous areas. If you are traveling on Jeju, it is best not to assume that coastal and mountain conditions will match a single island-wide forecast.
Because of the terrain, Jeju's mountains may receive more rainfall than coastal areas at the same time. If your itinerary includes Mount Hallasan or other mountainous destinations, you should check mountain-specific forecasts and any access restrictions separately rather than relying solely on the weather in urban areas of Jeju.
Along the coast, swells are another concern in addition to rain. Caution is needed near breakwaters and rocky shorelines directly exposed to waves, even when the weather temporarily appears to improve.
If you have plans on Jeju Island for 15, preparing an alternative indoor itinerary would be a practical precaution.
Why Can It Still Feel Hot When Rain Is Forecast?
On the morning of 15, minimum temperatures are generally expected to be in the lower to middle part of the 20°C range, while daytime highs are forecast to reach 27–33°C. In some areas, high humidity and temperatures may make conditions feel particularly hot before the rain begins in earnest.
In particular, some areas where heat advisories or warnings remain in effect may experience maximum apparent temperatures of around 33°C.
A forecast of rain does not necessarily mean cool conditions throughout the day. Some regions may remain hot and humid during the morning or before rainfall begins, with temperatures falling only after precipitation starts.
When going out, it is advisable to prepare for the heat as well as the rain by carrying sufficient drinking water and avoiding prolonged outdoor activities, rather than bringing only an umbrella.
Tropical nights may also occur in urban and coastal areas where temperatures do not fall sufficiently overnight.
How to Plan Liberation Day Outings Based on Location and Time
In central regions, including Seoul and Gyeonggi Province, it is advisable to carry a portable umbrella in case of showers. High humidity may also make outdoor conditions feel muggy even when it is not raining.
In Jeonnam and Gyeongnam, rain preparations become increasingly important for afternoon activities. In southern Chungcheong, Jeonbuk, and Gyeongbuk, the number of areas experiencing rain may increase as nighttime approaches.
In locations with a possibility of heavy rainfall, such as Jeju Island, the southern coast, and the Mount Jirisan area, checking rainfall intensity and any road or facility closures should take priority over simply carrying an umbrella.
If you are traveling a long distance by car, checking only the weather at your departure point is not enough. It is better to review hourly precipitation forecasts for both your travel route and destination.
The period when rainfall is expected to become more widespread than on Liberation Day itself is 16. If your plans extend from 15 through 16, checking the weather for specific travel times rather than relying only on daily forecasts will help you make more practical schedule adjustments.
How Will the Weekend Weather Change After August 15?
Rain beginning on 15 is expected to spread across most of the country by 16. In central regions, rainfall may temporarily stop in many areas from late afternoon on 16, although conditions will continue to vary by location.
Some areas may continue to experience rain until the morning of 17. Rain may persist longer on Jeju Island than in other regions, so anyone planning activities throughout the holiday period should not rely solely on the forecast for 15.
For planning purposes, it is more useful to understand the weather over this Liberation Day holiday as rain beginning in southern Korea on Saturday and spreading nationwide on Sunday, rather than simply saying that it will rain on Saturday.
Weather conditions can change quickly depending on where showers develop and how rain clouds move. For weather-sensitive activities such as outdoor events, hiking, and visits to valleys or coastal areas, the safest approach is to check the latest hourly forecasts and weather advisories immediately before departure.
In the Hwado area, based on the user's current location, conditions on 15 are expected to be mostly cloudy, with a possibility of thunderstorms in the afternoon. A heat advisory is currently displayed for Namyangju City. When checking local weather, it is better to prioritize location-specific short-term forecasts like this over nationwide outlooks.
Hwado
25°
C
/
F
Mostly cloudy, with thunderstorms in some areas during the afternoon
Sat
29°
22°
Sun
26°
23°
Mon
29°
23°
Tue
31°
23°
Wed
32°
23°
Thu
32°
23°
Fri
31°
23°
Weather Data Type: Precipitation