Jeju weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: April – June, September – October
What is the weather like in Jeju in January?
In January, Jeju is cold: daytime highs average 8 °C, and nights cool down to about 4 °C. The sea averages 15.4 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Rain falls on about 9 days, adding up to 56 mm. Snow falls on about 2 days. All in all, January is not an ideal month for a holiday in Jeju.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 32 | 20 | 28 |
| Day | 10° | 8° | 9° |
| Night | 6° | 4° | 5° |
| Sea | 17° | 15° | 14° |
| Sun | 3 h | 2 h | 4 h |
| Rain days | 8 | 9 | 8 |
More details for January
- Daylight
- 10 h 9 min07:38 – 17:47
- 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
- 73 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 2 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Seoul
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %68 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Warm jacket
- Rain jacket or umbrella
Jeju in January: quick answers
Is Jeju hot in January?
No. In January, Jeju is cold: daytime highs average 8 °C and nights drop to about 4 °C.
Can you swim in Jeju in January?
Only if you don't mind cold water: in January the sea averages just 15.4 °C. Comfortable swimming is possible from June to October.
Does it rain much in Jeju in January?
Rain falls on about 9 days, adding up to 56 mm.
Jeju month by month
The whole year in JejuAll destinations: South KoreaWhere to go in JanuarySea temperature in January
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