January weather forecast
Jeju, South Korea

The transition from winter to spring in Jeju, South Korea, starts with January, best known for its chilly temperatures with highs of 8.3°C (46.9°F) and lows dipping to 3.2°C (37.8°F). The month is considered cold, yet precipitation is relatively moderate in the form of scattered showers and possibly snow, keeping the island's vegetation lush. January's cooler climate also offers the perfect ambience for indoor activities or venturing into the island's hot springs. This month also marks an offseason making it an appealing time for those seeking a more tranquil and less crowded experience in Jeju. Despite the cold, January still calls for commendable outdoor adventures such as climbing Hallasan, the island's towering volcanic peak.

Temperature

January proves to be the coldest month, recording an average maximum temperature of 8.3°C (46.9°F) and a minimum temperature of 3.2°C (37.8°F).

Humidity

In January, the average relative humidity is 65.3%.

Rainfall

In Jeju, in January, during 12.6 rainfall days, 65mm (2.56") of precipitation is typically accumulated. In Jeju, during the entire year, the rain falls for 130.2 days and collects up to 1498mm (58.98") of precipitation.

Sea temperature

In Jeju, in January, the average water temperature is 14.8°C (58.6°F).
Note: While a brief time in 14.8°C (58.6°F) at 13°C (55.4°F) is already bracing, plunging below 10°C (50°F) can severely affect breathing and introduce a cold shock, relying on your physical state.

Daylight

The average length of the day in January is 10h and 13min.
On the first day of January, sunrise is at 07:37 and sunset at 17:36. On the last day of the month, sunrise is at 07:31 and sunset at 18:03 KST.

Sunshine

January has the least sunshine of the year, 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 reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum UV index of 3 in January translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.