Jeju
South Korea
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Jeju, South Korea

A high sunrise Panorama of the Jeju Island in Jeju, South Korea
A high sunrise Panorama of the Jeju Island in Jeju, South Korea
January, the same as December, in Jeju, South Korea, is another chilly winter month, with temperature in the range of an average low of 3.2°C (37.8°F) and an average high of 8.3°C (46.9°F).

Temperature

January is the coldest month, with an average high-temperature of 8.3°C (46.9°F) and an average low-temperature of 3.2°C (37.8°F).

Humidity

In Jeju, South Korea, the average relative humidity in January is 65.3%.

Rainfall

In Jeju, in January, it is raining for 12.6 days, with typically 65.2mm (2.6") of accumulated precipitation. In Jeju, during the entire year, the rain falls for 130.2 days and collects up to 1497.7mm (59") of precipitation.

Sea temperature

In Jeju, the average seawater temperature in January is 14.8°C (58.6°F).
Note: Swimming in 14.8°C (58.6°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Jeju, South Korea, the average length of the day is 10.2h.

Sunshine

The month with the least sunshine in Jeju is January, with an average of 2.3h of sunshine.

UV index

January and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the average person.
Note: In January, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the coldest month in Jeju?

With an average high-temperature of 8.3°C (46.9°F) and an average low-temperature of 3.2°C (37.8°F), January is the coldest month in Jeju.

What is the temperature in January in Jeju?

In Jeju, in January, the average high-temperature is 8.3°C (46.9°F), and the average low-temperature is 3.2°C (37.8°F).

What is the average humidity in January in Jeju?

The average relative humidity in January in Jeju is 65.3%.

How many days does it rain in January in Jeju?

In Jeju, South Korea, in January, during 12.6 rainfall days, 65.2mm (2.6") of precipitation is typically accumulated.

What is the water temperature in January in Jeju?

In Jeju, the average seawater temperature in January is 14.8°C (58.6°F). Swimming in 14.8°C (58.6°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

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

In Jeju, the average length of the day in January is 10.2h.

What is the month with the least sunshine in Jeju?

The month with the least sunshine in Jeju, South Korea, is January, with an average of 2.3h of sunshine.

How long on average sun shines in January in Jeju?

In January, the average sunshine is 2.3h.

When is the lowest UV index in Jeju?

January and December, with an average maximum UV index of 3, are months with the lowest UV index.

How high is the UV index in January in Jeju?

In January, the average daily maximum UV index in Jeju, South Korea, is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in January - Jeju, South Korea
  • Average high temperature in January: 8.3°C

The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in January: 3.2°C

The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is January (3.2°C).

Average humidity in January - Jeju, South Korea
  • Average humidity in January: 65.3%

The month with the highest relative humidity is July (78.3%).
Months with the lowest relative humidity are February and March (64.9%).

Average rainfall in January - Jeju, South Korea
  • Average rainfall in January: 65.2mm

The wettest month (with the highest rainfall) is August (262.5mm).
The driest month (with the lowest rainfall) is December (47.7mm).

Average rainfall days in January - Jeju, South Korea
  • Average rainfall days in January: 12.6 days

The month with the highest number of rainy days is August (13.5 days).
The month with the lowest number of rainy days is October (7 days).

Average sea temperature in January - Jeju, South Korea
  • Average sea temperature in January: 14.8°C

The best month for swimming (with the highest average sea temperature) is August (26.2°C).
The coldest month (with the lowest average sea temperature) is March (13.3°C).

Average daylight in January / Average sunshine in January - Jeju, South Korea
  • Average daylight in January: 10.2h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in January: 2.3h

The month with most sunshine is May (Average sunshine: 6.8h).
The month with least sunshine is January (Average sunshine: 2.3h).

Average UV index in January - Jeju, South Korea
  • Average UV index in January: 3

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).