Seoul weather in December 2026

Q: How cold is it in Seoul in December?

Daytime temperatures usually reach 4°C in Seoul in December, falling to -5°C at night.

Q: How sunny is it in Seoul in December?

There are normally 5 hours of bright sunshine each day in Seoul in December - that's 53% of daylight hours.

Q: Does it rain in Seoul in December?

There are usually 7 days with some rain in Seoul in December and the average monthly rainfall is 21mm. Rain may fall as snow in this month.

Expect daytime maximum temperatures of 4°C in Seoul, South Korea in December based on long-term weather averages. There are 5 hours of sunshine per day on average, which might fall as snow.

4
4°C max day temperature
5
5 hours of sunshine per day
7
7 days with some rainfall
-5
-5°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
21
21 mm of monthly rainfall
2
2 (Low) UV index

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The December weather guide for South Korea (Seoul) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

How cold is it in Seoul in December?

Daytime temperatures usually reach 4°C in Seoul in December, falling to -5°C at night.

How sunny is it in Seoul in December?

There are normally 5 hours of bright sunshine each day in Seoul in December - that's 53% of daylight hours.

Does it rain in Seoul in December?

There are usually 7 days with some rain in Seoul in December and the average monthly rainfall is 21mm. Rain may fall as snow in this month.