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The weather in Jeju in January is very cold with temperatures between 4°C and 7°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Jeju during the month of January. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
You can expect a few days of snow in Jeju during January. It’s important to get out your snow boots and warm mittens to stay warm while you explore Jeju.
Our weather forecast can give you a great sense of what weather to expect in Jeju in January 2026.
If you’re planning to visit Jeju in the near future, we highly recommend that you review the 14 day weather forecast for Jeju before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 4° | 7 | 18 | 6 | 95 mm | Awful | Jeju in January |
| February | 8° / 5° | 7 | 18 | 3 | 104 mm | Awful | Jeju in February |
| March | 11° / 7° | 7 | 23 | 1 | 123 mm | Bad | Jeju in March |
| April | 15° / 11° | 6 | 24 | 0 | 147 mm | Good | Jeju in April |
| May | 19° / 15° | 5 | 26 | 0 | 143 mm | Good | Jeju in May |
| June | 23° / 19° | 7 | 23 | 0 | 218 mm | Good | Jeju in June |
| July | 27° / 23° | 9 | 22 | 0 | 301 mm | Good | Jeju in July |
| August | 28° / 24° | 8 | 23 | 0 | 277 mm | Good | Jeju in August |
| September | 25° / 21° | 8 | 22 | 0 | 286 mm | Good | Jeju in September |
| October | 20° / 17° | 3 | 28 | 0 | 152 mm | Good | Jeju in October |
| November | 15° / 11° | 5 | 25 | 0 | 103 mm | Good | Jeju in November |
| December | 9° / 6° | 8 | 21 | 3 | 92 mm | Awful | Jeju in December |