Seoul vs Jeju

Seoul and Jeju are closely matched in August. 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.

Seoul can feel quite hot at 29°C, so plan for heat. Jeju is also comfortable at 28°C.

For travelers who prioritize dry weather, Seoul is the stronger choice in August. Jeju receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.

Seoul reaches an average high of 29°C (84°F) and drops to 22°C (72°F) at night during August. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Jeju averages 28°C (82°F) for the high and 25°C (77°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 August.

Seoul receives approximately 263 mm of rainfall across 16 rain days during August. Rain is frequent, so waterproof gear is essential.

Jeju sees 227 mm over 17 rain days. That makes Seoul the drier option by 1 rain day and 36 mm of total precipitation.

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