Jeju vs Busan

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Busan edges ahead as the better destination in September. Busan offers 8 hours of daily sunshine with only 10 rain days, while Jeju sees 8 sunshine hours and 13 rain days.

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

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

Jeju reaches an average high of 25°C (77°F) and drops to 22°C (72°F) at night during September. The daily temperature range is 3°C, meaning relatively stable temperatures from day to night.

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

Jeju receives approximately 188 mm of rainfall across 13 rain days during September. You can expect rain roughly every other day.

Busan sees 164 mm over 10 rain days. That makes Busan the drier option by 3 rain days and 24 mm of total precipitation.

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