Jeju vs Busan

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Busan edges ahead as the better destination in January. Busan 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. Busan is cooler at 6°C.

For travelers who prioritize dry weather, Busan is the stronger choice in January. Busan 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.

Busan averages 6°C (43°F) for the high and 0°C (32°F) for the low, with a daily range of 6°C. The two cities feel quite similar in terms of temperature.

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.

Busan sees 32 mm over 4 rain days. That makes Busan the drier option by 5 rain days and 30 mm of total precipitation.

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