Jeju vs Seoul

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Seoul edges ahead as the better destination in January. Seoul offers 8 hours of daily sunshine with only 4 rain days, while Jeju sees 5 sunshine hours and 9 rain days.

Jeju is on the cooler side at 7°C, requiring warmer clothing. Seoul is cooler at 1°C.

For travelers who prioritize dry weather, Seoul is the stronger choice in January. Seoul receives 3 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Jeju reaches an average high of 7°C (45°F) and drops to 4°C (39°F) at night during January. The daily temperature range is 3°C, meaning relatively stable temperatures from day to night.

Seoul averages 1°C (34°F) for the high and -7°C (19°F) for the low, with a daily range of 8°C. There is a notable 6°C gap between the two cities, so expect a very different feel.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in January.

Jeju receives approximately 62 mm of rainfall across 9 rain days during January. You can expect rain roughly every other day.

Seoul sees 19 mm over 4 rain days. That makes Seoul the drier option by 5 rain days and 43 mm of total precipitation.

Humidity also differs: Jeju averages 70% while Seoul sits at 65%. Jeju will feel muggier, especially at higher temperatures.