December weather forecast and climate
Seoul, South Korea

The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
December is cold in Seoul as the winter takes charge of the city. The skies are cloudy at times but also remain clear during long periods of sunshine.
The average temperatures are in the -3.3°C (26.1°F) to 4.4°C (39.9°F) range, but the cold can be severe, and the temperatures can drop down significantly.
The shortest days of the year are during the fourth week of December when the daylight hardly lasts for 10 hours. The winter in Seoul is usually chilly, and the rain is negligible in this period. Warm winter coats go a long way to face the cold.

What is the temperature in December in Seoul?

In December, the average high-temperature is 4.3°C (39.7°F), and the average low-temperature is -3.2°C (26.2°F).
Average temperature in December - Seoul, South Korea
  • Average high temperature in December: 4.3°C

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (1.5°C).

  • Average low temperature in December: -3.2°C

The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

Average humidity in December - Seoul, South Korea
  • Average humidity in December: 60.6%

The month with the highest relative humidity is July (78.3%).
The month with the lowest relative humidity is April (56.2%).

Average rainfall in December - Seoul, South Korea
  • Average rainfall in December: 21.5mm

The wettest month (with the highest rainfall) is July (394.7mm).
The driest month (with the lowest rainfall) is January (20.8mm).

Average rainfall days in December - Seoul, South Korea
  • Average rainfall days in December: 7.4 days

The month with the highest number of rainy days is July (16.3 days).
The month with the lowest number of rainy days is February (5.8 days).

Average daylight in December / Average sunshine in December - Seoul, South Korea
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 4.9h

The month with most sunshine is May (Average sunshine: 6.9h).
The month with least sunshine is July (Average sunshine: 3.9h).

Average UV index in December - Seoul, South Korea
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 10).
Months with the lowest UV index are January and December (UV index 2).

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