Jeju weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: April – June, September – October
What is the weather like in Jeju in December?
In December, Jeju is cool: daytime highs average 10 °C, and nights cool down to about 6 °C. The sea averages 16.9 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain falls on about 8 days, adding up to 53 mm. All in all, December is not an ideal month for a holiday in Jeju.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 63 | 32 | 20 |
| Day | 16° | 10° | 8° |
| Night | 12° | 6° | 4° |
| Sea | 19° | 17° | 15° |
| Sun | 4 h | 3 h | 2 h |
| Rain days | 8 | 8 | 9 |
More details for December
- Daylight
- 9 h 57 min07:30 – 17:27
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 65 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Seoul
How the score comes together
- Temperatureweight 50 %21 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %71 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- A jumper for the evenings
- Rain jacket or umbrella
Jeju in December: quick answers
Is Jeju hot in December?
No. In December, Jeju is cool: daytime highs average 10 °C and nights drop to about 6 °C.
Can you swim in Jeju in December?
Only if you don't mind cold water: in December the sea averages just 16.9 °C. Comfortable swimming is possible from June to October.
Does it rain much in Jeju in December?
Rain falls on about 8 days, adding up to 53 mm.
Jeju month by month
The whole year in JejuAll destinations: South KoreaWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences