Seoul vs Jeju

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.

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

Seoul reaches an average high of 1°C (34°F) and drops to -7°C (19°F) at night during January. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Jeju averages 7°C (45°F) for the high and 4°C (39°F) for the low, with a daily range of 3°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.

Seoul receives approximately 19 mm of rainfall across 4 rain days during January. Rain is occasional, so a light rain jacket should suffice.

Jeju sees 62 mm over 9 rain days. That makes Seoul the drier option by 5 rain days and 43 mm of total precipitation.

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