Cool Morning at 15°C; Watch for Large Temperature Swings

The start of the week brought clear autumn skies.

As you can see, only high clouds are passing across the country, keeping conditions mostly sunny.

As skies gradually clear in the central regions, night-time radiative cooling—where heat rapidly escapes from the Earth's surface—will become quite active.

Consequently, tomorrow morning, September 15, will feel a bit cooler than today. As indicated by the blue areas on the map, morning temperatures in the central regions and some inland parts of the southern areas will drop below 15°C (59°F).

Seoul is expected to start at 15°C (59°F), while Paju and Cheorwon will drop to 12°C (54°F), marking a drop of 3°C to 4°C compared to today in central areas.

During the day, strong sunlight will quickly raise temperatures. Especially in the southern regions, it will get hot with highs nearing 30°C (86°F).

With large temperature swings of more than 10°C (18°F) between day and night, you should take extra care of your health.

Skies will remain mostly clear tomorrow, though thick fog is expected until morning in Gyeonggi Province, southern Gangwon Province, and North Chungcheong Province.

Only the east coast regions will be cloudy tomorrow, with light rain of under 5 mm expected in the afternoon along the east coast of North Gyeongsang Province and in Ulsan.

Looking at detailed morning temperatures, Seoul will be 15°C (59°F) and Daegu 17°C (63°F), lower than today. Daytime highs will rise to 27°C (81°F) in Seoul and 28°C (82°F) in Busan.

Later this week, rain is forecasted for the east coast and Jeju Island, while other inland areas will enjoy clear skies with large temperature variations.

(Reporting by Weather Forecaster Nam Yu-jin)
※ Please note: This article was translated by AI and may contain errors.