Sejong Hourly Weather Forecast and Tomorrow’s Outlook

The Korea Meteorological Administration (KMA) has issued a comprehensive weather forecast for the period from June 4 to June 8, 2026, warning of unstable atmospheric conditions across much of South Korea. The agency cautioned that most regions, with the exception of Jeju Island, could experience showers accompanied by gusts, thunder, lightning, and hail through the night of June 4, 2026.

According to the forecast released at 17:00 on June 4, 2026, the immediate weather pattern is characterized by widespread cloud cover. While Jeju Island is expected to remain occasionally cloudy, the rest of the country faces a high probability of localized showers between 18:00 and 24:00 on June 4, 2026.

Regional Rainfall and Immediate Warnings

The KMA provided specific precipitation estimates for the Seoul metropolitan area and surrounding Gyeonggi Province for June 4, 2026. Forecasted rainfall for northwestern and eastern Gyeonggi Province ranges from 5 to 40 millimeters, with some areas in eastern Gyeonggi expected to receive more than 60 millimeters.

In Seoul, Incheon, and southwestern Gyeonggi Province, the expected rainfall is lower, estimated between 5 and 20 millimeters. The agency emphasized that these showers could be accompanied by sudden gusts and electrical activity, urging caution in these densely populated regions.

Mid-Term Forecast for June 5, 2026

The weather pattern is expected to shift on June 5, 2026, as cloud cover begins to clear across the country starting in the morning. However, several regions will experience precipitation during the early hours of the day.

Rain is forecasted for the central regions and the Jeolla region between 00:00 and 09:00 on June 5, 2026. In the inland and mountainous areas of Gangwon Province, as well as northern Chungbuk, this rain is expected to persist until 12:00.

the KMA anticipates light rain or drizzle, measuring less than 0.1 millimeters, in several other areas between 03:00 and 09:00 on June 5, 2026. These areas include the western and northeastern inland regions of Gyeongbuk, the northeastern mountains of Gyeongbuk, the northwestern inland areas of Gyeongnam, and Jeju Island.

Extended Outlook through June 8, 2026

The forecast for the remainder of the period indicates a fluctuating pattern of cloud cover and clarity across the peninsula.

On June 6, 2026, the central regions are expected to be mostly clear, though conditions will gradually turn cloudy starting at night. Meanwhile, the southern regions and Jeju Island will be occasionally cloudy before clearing up in the afternoon.

By June 7, 2026, the central regions will be mostly cloudy, transitioning to occasionally cloudy conditions from the morning. The southern regions and Jeju Island will also remain occasionally cloudy throughout the day, with the entire country expected to turn cloudy again starting at night.

The forecast for June 8, 2026, suggests a split in weather conditions. The central regions are expected to be mostly clear, while the southern regions and Jeju Island will remain mostly cloudy.