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 and lows dipping to 3.2°C. 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

Jeju's coldest temperatures are experienced in January, with average high temperatures of 8.3°C and lows of 3.2°C.

Humidity

The average relative humidity in January is 65.3%.

Rainfall

In Jeju, in January, it is raining for 12.6 days, with typically 65mm of accumulated precipitation. In Jeju, South Korea, during the entire year, the rain falls for 130.2 days and collects up to 1498mm of precipitation.

Sea temperature

In January, the average sea temperature in Jeju, South Korea, is 14.8°C.
Note: Staying in 14.8°C waters for just a few moments at 13°C can be harrowing, and below 10°C poses breathing and cold shock risks, depending on individual tolerance.

Daylight

The average length of the day in January in Jeju, South Korea, is 10h and 13min.
On the first day of the month, sunrise is at 07:37 and sunset at 17:36. On the last day of January, in Jeju, sunrise is at 07:30 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

The months with the lowest UV index in Jeju are January and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 3 in January transforms into this advice:
Take precautions - Protection against skin and eye damage is obliged. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Experience reduced UV exposure by about half when donning a wide-brim hat.