Jeju vs Busan

Jeju and Busan are closely matched in September. Neither city has a clear advantage across all metrics. Your decision should come down to personal preference, cultural interests, and travel logistics rather than weather alone.

Jeju sits in the comfortable travel range at 16°C. Busan is also comfortable at 25°C.

For travelers who prioritize dry weather, Jeju is the stronger choice in September. Busan receives 4 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Jeju reaches an average high of 16°C (61°F) and drops to 8°C (46°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Busan averages 25°C (77°F) for the high and 20°C (68°F) for the low, with a daily range of 5°C. There is a notable 9°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 September.

Jeju receives approximately 50 mm of rainfall across 4 rain days during September. Rain is occasional, so a light rain jacket should suffice.

Busan sees 164 mm over 10 rain days. That makes Jeju the drier option by 6 rain days and 114 mm of total precipitation.

Both cities share similar humidity levels at 65%.