Today (September 22) remained clear, mainly in the western regions, as the late-summer heat continued.

Tomorrow is Chubun, the autumnal equinox, when the lengths of day and night become equal.

The weather will remain mostly clear through tomorrow, but starting the day after tomorrow, when the Chuseok holiday begins, the skies will turn cloudy with rain expected in some areas.

First, rain will begin in the northern coastal areas of Gangwon Yeongdong late Thursday night—the first day of the holiday—and continue until the morning of Chuseok day in Gangwon Yeongdong and the northern east coast of Gyeongsangbuk-do. Rain is also forecast for central regions, including Seoul, from Chuseok night until early Saturday morning.

Additionally, rain is expected on Saturday mainly in the southern regions and Jeju.

While precipitation amounts have not yet been released, rainfall is not expected to be heavy.

Meanwhile, cloudy skies are expected to make it somewhat difficult to see the full moon this Chuseok.

However, according to the Korea Astronomy and Space Science Institute, a more perfectly round full moon will appear early Sunday morning rather than on Chuseok day itself.

The roundest full moon is expected to be visible through the clouds in some regions.

Tomorrow will also be mostly clear, but strong swells will continue to flow into the east coast areas through tomorrow, requiring caution.

Morning lows are expected to be 19°C (66°F) in Seoul and 18°C (64°F) in Gwangju, while daytime highs will rise to 29°C (84°F) in Seoul and 30°C (86°F) in Daegu and Gwangju.

Large temperature differences between morning and night will persist throughout the Chuseok holiday.

Please take good care of your health.

(Weathercaster Nam Yu-jin)