Weather in Seoul for December 2026

December in Seoul, South Korea, marks the onset of winter, bringing a noticeable drop in temperatures and a festive atmosphere. At the beginning of the month, temperatures typically range from 0° to 8° during the day, with nighttime temperatures often dipping below freezing.

The skies are generally clear, though the air can be quite dry, and the city occasionally experiences light snowfall, adding a picturesque quality to the urban landscape.

As the month progresses, the weather becomes colder. By mid-December, daytime temperatures usually hover between 0° and 5°, while nighttime temperatures can fall to around -5°. The wind chill factor can make it feel even colder, so it's advisable to dress in layers and wear warm clothing.

Towards the end of December, the cold intensifies, with daytime temperatures often staying below 0° and nighttime temperatures dropping to around -10°. Snowfall becomes more frequent, although it is usually light and doesn't accumulate significantly.

The festive season brings a lively atmosphere to the city, with holiday lights and decorations brightening up the cold, crisp nights.

Overall, December in Seoul is characterized by cold, dry weather with occasional snow, making it a perfect time to enjoy winter activities and the festive holiday spirit.