In December warmest sea in South Korea is usually observed in the following locations: Jeju, Busan, Yongpyong.
Table below shows the average sea water temperature for marine resorts of South Korea in December for the last three years.
| Place name | December 2025 | December 2024 | December 2023 |
|---|---|---|---|
| Jeju | 65.5°F | 62.8°F | 62.6°F |
| Busan | 60.7°F | 58.9°F | 58.9°F |
| Yongpyong | 57.0°F | 56.0°F | 56.0°F |
| Seoul | 48.4°F | 46.2°F | 46.2°F |
| Incheon | 48.3°F | 45.5°F | 45.7°F |
Charts below show average sea water temperature for South Korea resorts with the warmest sea in December.
You can also check other months of the year to see sea temperature of South Korea resorts at that time.
Places in South Korea:
Name
°F
