Jeju City weather in January
January is one of the least pleasant months in Jeju City: highs of 9°C (48°F) and about 50 mm (2.0 in) of rain on average. Nights average 6°C (43°F) and cloud cover 78% (NASA POWER, 2001–2025 averages). The sea averages 16°C (60°F). It is the driest month of the year and the coolest. Compared with December, it is cooler and about as wet; February brings highs of 9°C (49°F) and 66 mm (2.6 in) of rain.
Is January a good time to visit Jeju City?
least pleasant month Weather score 42/100.
January is one of the least pleasant months for weather in Jeju City. For better conditions, consider Oct.
Does it rain a lot in Jeju City in January?
No, it is usually dry: about 50 mm (2.0 in) falls in an average January. It is the driest month of the year.
How warm is Jeju City in January?
Days average 9°C (48°F) and nights 6°C (43°F).
Jeju City weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 9°C (48°F) | 6°C (43°F) | 50 mm | 78% | 16°C (60°F) | least pleasant |
| February | 9°C (49°F) | 7°C (44°F) | 66 mm | 74% | 14°C (58°F) | least pleasant |
| March | 11°C (53°F) | 8°C (47°F) | 90 mm | 69% | 14°C (56°F) | least pleasant |
| April | 15°C (58°F) | 12°C (53°F) | 137 mm | 70% | 15°C (59°F) | least pleasant |
| May | 18°C (64°F) | 15°C (60°F) | 141 mm | 73% | 17°C (63°F) | fair |
| June | 22°C (71°F) | 20°C (67°F) | 192 mm | 81% | 22°C (71°F) | fair |
| July | 26°C (78°F) | 24°C (75°F) | 240 mm | 74% | 27°C (80°F) | least pleasant |
| August | 28°C (82°F) | 26°C (79°F) | 261 mm | 67% | 30°C (87°F) | least pleasant |
| September | 25°C (76°F) | 23°C (73°F) | 185 mm | 68% | 29°C (85°F) | fair |
| October | 20°C (69°F) | 18°C (65°F) | 89 mm | 59% | 26°C (79°F) | best |
| November | 16°C (60°F) | 13°C (56°F) | 72 mm | 66% | 22°C (71°F) | fair |
| December | 11°C (52°F) | 8°C (47°F) | 56 mm | 77% | 18°C (65°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months