January 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
January is the coldest month of the year in Seoul with the average temperatures in the -6.1°C (21°F) to 1.7°C (35.1°F) range. The peak of the winter occurs during New Year when the conditions are severely cold, and the temperatures may even touch -17.8°C (-0°F).
January is the snowiest month, but the snow is light in Seoul and does not accumulate on the ground. The days are mostly dry, while the nights are frosty, especially when the northern gale blows across the city. The skies are dark, and the daily sunshine lasts for 5 hours in the short days.
January is mostly the time to avoid visiting Seoul!
Average temperature in January - Seoul, South Korea
  • Average high temperature in January: 1.5°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 January: -5.9°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 January - Seoul, South Korea
  • Average humidity in January: 59.8%

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 January - Seoul, South Korea
  • Average rainfall in January: 20.8mm

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 January - Seoul, South Korea
  • Average rainfall days in January: 6.5 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 January / Average sunshine in January - Seoul, South Korea
  • Average daylight in January: 9.9h

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 January: 5.2h

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 January - Seoul, South Korea
  • Average UV index in January: 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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