January weather forecast
Seoul, South Korea

The Dongdaemun Gate in Seoul city, South Korea
The Dongdaemun Gate in Seoul city, South Korea

Weather in January

January, like December, in Seoul, South Korea, is another cold winter month, with an average temperature varying between 1.5°C (34.7°F) and -5.9°C (21.4°F).

Temperature

With an average high-temperature of 1.5°C (34.7°F) and an average low-temperature of -5.9°C (21.4°F), January is the coldest month.

Humidity

In January, the average relative humidity in Seoul is 59.8%.

Rainfall

January is the month with the least rainfall. Rain falls for 6.5 days and accumulates 20.8mm (0.82") of precipitation.

Daylight

In Seoul, the average length of the day in January is 9h and 55min.
On the first day of January in Seoul, sunrise is at 07:46 and sunset at 17:24. On the last day of the month, sunrise is at 07:36 and sunset at 17:54 KST.

Sunshine

In January, the average sunshine in Seoul is 5.2h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In January, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in Seoul?

The coldest month is January, with an average high-temperature of 1.5°C (34.7°F) and an average low-temperature of -5.9°C (21.4°F).

What is the average humidity in January in Seoul?

In Seoul, South Korea, the average relative humidity in January is 59.8%.

What is the driest month in Seoul?

January is the month with the least rainfall. Rain falls for 6.5 days and accumulates 20.8mm (0.82") of precipitation.

How many days does it rain in January in Seoul?

In Seoul, during January, the rain falls for 6.5 days and regularly aggregates up to 20.8mm (0.82") of precipitation.

What is the average length of the day in January in Seoul?

The average day length in January in Seoul, South Korea, is 9h and 55min.

When are sunrise and sunset in January in Seoul?

In January, on the first day of the month, sunrise is at 07:46 and sunset at 17:24. On the last day of the month, sunrise is at 07:36 and sunset at 17:54 KST.

How many hours of sunshine does Seoul have in January?

The average sunshine duration in January in Seoul, South Korea, is 5.2h.

What are the months with the lowest UV index in Seoul?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in January in Seoul?

In Seoul, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in January
Seoul, South Korea

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).

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Average humidity in January
Seoul, South Korea

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%).

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Average rainfall in January
Seoul, South Korea

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 least rainfall) is January (20.8mm).

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Average rainfall days in January
Seoul, South Korea

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 least rainy days is February (5.8 days).

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Average daylight in January /
Average sunshine in January
Seoul, South Korea

Average daylight in January / Average sunshine in January - Seoul, South Korea
  • Average daylight in January: 9h and 55min

The month with the longest days is June (Average daylight: 14h and 43min).
The month with the shortest days is December (Average daylight: 9h and 37min).

  • Average sunshine in January: 5h and 12min

The month with the most sunshine is May (Average sunshine: 6h and 54min).
The month with the least sunshine is July (Average sunshine: 3h and 54min).

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Average UV index in January
Seoul, South Korea

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).
The months with the lowest UV index are January and December (UV index 2).

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