In December warmest sea in Gulf of Thailand is usually observed in the following locations: Koh Kong, Koh Kood, Koh Rong.
Table below shows the average sea water temperature for marine resorts of Gulf of Thailand in December for the last three years.
| Place name | December 2025 | December 2024 | December 2023 |
|---|---|---|---|
| Koh Kong | 83.2°F | 83.8°F | 85.0°F |
| Koh Kood | 83.0°F | 84.2°F | 85.1°F |
| Koh Rong | 83.0°F | 84.1°F | 84.8°F |
| Ko Mak | 82.4°F | 83.7°F | 85.0°F |
| Koh Chang | 82.3°F | 83.5°F | 84.8°F |
| Ko Wai | 82.2°F | 83.4°F | 84.8°F |
| Trat | 82.0°F | 83.0°F | 84.5°F |
| Samet | 81.8°F | 83.3°F | 84.6°F |
| Rayong | 81.8°F | 83.3°F | 84.5°F |
| Koh Lan | 81.1°F | 83.1°F | 84.2°F |
| Jomtien | 80.9°F | 82.6°F | 83.9°F |
| Pattaya | 80.9°F | 82.6°F | 83.9°F |
| Cha-am | 80.1°F | 81.7°F | 83.2°F |
| Hua Hin | 80.1°F | 81.6°F | 83.1°F |
| Prachuap Khiri Khan | 80.0°F | 81.9°F | 83.0°F |
| Bangkok | 79.9°F | 81.0°F | 82.8°F |
Charts below show average sea water temperature for Gulf of Thailand resorts with the warmest sea in December.
You can also check other months of the year to see sea temperature of Gulf of Thailand resorts at that time.
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