Busan vs Jeju

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.

Busan is on the cooler side at 6°C, requiring warmer clothing. Jeju is cooler at 7°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.

Busan reaches an average high of 6°C (43°F) and drops to 0°C (32°F) at night during January. The daily temperature range is 6°C, meaning relatively stable temperatures from day to night.

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

Busan receives approximately 32 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 Busan the drier option by 5 rain days and 30 mm of total precipitation.

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