Jeju weather in January
January in Jeju: cold, a little rain — one of the weakest months to visit.
#12 of 12 months in Jeju · #510 of 604 destinations to visit in January · comfort 45/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Jeju climate normals — January
| Daytime high | 9°C / 48°F | 🧥 cold |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Feels like (high) | 5°C / 41°F | |
| Rainfall | 71 mm / 2.8 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 67% | 💧 humid |
| Dew point | 1°C / 34°F | |
| Sunshine | 6.2 h/day | |
| Daylight | 10.2 h | |
| Wind | 28 km/h / 17 mph | |
| Snowfall | 6 cm / 2.4 in | |
| Air quality (US AQI) | 55 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Jeju in January — FAQ
- Is January a good time to visit Jeju?
- January in Jeju: cold, a little rain — one of the weakest months to visit. It ranks #12 of 12 months for Jeju on SeasonMap's comfort score (45/100).
- What is the weather like in Jeju in January?
- In January, Jeju averages a daily high of 9°C and a low of 5.7°C, with about 70.5 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Jeju in January?
- Jeju has a mean US Air Quality Index of about 55 in January.
- Does it snow in Jeju in January?
- Jeju sees roughly 6 cm of snowfall in January.