The South Korea resorts with the warmest sea water temperature in April are Jeju, Busan and Yongpyong.
Below you can see a list of all popular South Korea resorts and information about sea water temperature in April for the last two years.
| Resort Name | April 2026 | April 2025 | April 2024 |
|---|---|---|---|
| Jeju | 61.5°F | 58.8°F | 62.0°F |
| Busan | 59.0°F | 55.0°F | 59.3°F |
| Yongpyong | 54.0°F | 49.8°F | 54.7°F |
| Seoul | 50.4°F | 49.8°F | 51.8°F |
| Incheon | 50.2°F | 49.5°F | 52.1°F |
Please see following sea water temperature averages charts for the warmest South Korea resorts in April.
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
