Jeju vs Seoul

Jeju and Seoul 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.

Jeju sits in the comfortable travel range at 28°C. Seoul runs hot at 29°C.

For travelers who prioritize dry weather, Seoul is the stronger choice in August. Jeju receives 2 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Jeju reaches an average high of 28°C (82°F) and drops to 25°C (77°F) at night during August. The daily temperature range is 3°C, meaning relatively stable temperatures from day to night.

Seoul averages 29°C (84°F) for the high and 22°C (72°F) for the low, with a daily range of 7°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.

Jeju receives approximately 227 mm of rainfall across 17 rain days during August. Rain is frequent, so waterproof gear is essential.

Seoul sees 263 mm over 16 rain days. That makes Seoul the drier option by 1 rain day and 36 mm of total precipitation.

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