Seoul
South Korea
Long-term weather forecast
Long-term weather forecast
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January weather forecast and Climate
Seoul, South Korea

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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 around 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 around 5 hours in the short days.
January is mostly the time to avoid visiting Seoul!
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  • The 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).

  • The 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).

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  • The 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%).

  • The 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).

  • The 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).

  • The average daylight in January: 10h

The month with the longest days is June (Average daylight: 15h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The 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).

  • The 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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