The Thailand resorts with the warmest sea water temperature in December are Ko Li Pe, Khao Lak and Koh Lanta.
Below you can see a list of all popular Thailand resorts and information about sea water temperature in December for the last two years.
| Resort Name | December 2025 | December 2024 | December 2023 |
|---|---|---|---|
| Ko Li Pe | 87.9°F | 88.9°F | 88.2°F |
| Khao Lak | 87.7°F | 88.0°F | 88.0°F |
| Koh Lanta | 87.3°F | 87.6°F | 87.9°F |
| Kata Beach | 87.3°F | 88.3°F | 88.0°F |
| Karon Beach | 87.3°F | 88.3°F | 88.0°F |
| Krabi | 87.3°F | 87.7°F | 87.9°F |
| Surin Beach | 87.2°F | 88.1°F | 88.1°F |
| Patong Beach | 87.2°F | 88.2°F | 88.1°F |
| Kamala Beach | 87.2°F | 88.1°F | 88.1°F |
| Bang Tao Beach | 87.2°F | 88.1°F | 88.1°F |
| Rawai Beach | 87.2°F | 88.3°F | 88.1°F |
| Nai Harn Beach | 87.2°F | 88.3°F | 88.1°F |
| Kalim Beach | 87.2°F | 88.2°F | 88.1°F |
| Mai Khao Beach | 87.2°F | 88.0°F | 88.1°F |
| Phi Phi | 87.2°F | 88.2°F | 87.9°F |
| Nai Yang Beach | 87.2°F | 88.0°F | 88.1°F |
| Similan | 87.1°F | 88.1°F | 87.7°F |
| Phuket | 87.1°F | 88.1°F | 88.1°F |
| Cape Panwa | 87.0°F | 88.1°F | 88.1°F |
| Hat Yai | 86.7°F | 86.8°F | 87.2°F |
| Narathiwat | 86.7°F | 86.9°F | 87.2°F |
| Pattani | 86.4°F | 86.8°F | 87.2°F |
| Koh Kood | 86.4°F | 88.0°F | 89.1°F |
| Ko Mak | 85.7°F | 87.4°F | 88.9°F |
| Koh Chang | 85.6°F | 87.2°F | 88.7°F |
| Ko Wai | 85.5°F | 87.1°F | 88.7°F |
| Trat | 85.4°F | 86.7°F | 88.3°F |
| Samet | 85.0°F | 86.9°F | 88.4°F |
| Rayong | 85.0°F | 87.0°F | 88.4°F |
| Chaweng Beach | 84.8°F | 86.9°F | 87.4°F |
| Lamai Beach | 84.8°F | 86.9°F | 87.4°F |
| Choeng Mon Beach | 84.8°F | 86.9°F | 87.3°F |
| Samui | 84.8°F | 86.9°F | 87.3°F |
| Bo Phut Beach | 84.7°F | 86.8°F | 87.3°F |
| Mae Nam Beach | 84.7°F | 86.8°F | 87.3°F |
| Tao | 84.7°F | 86.6°F | 87.2°F |
| Taling Ngam Beach | 84.6°F | 86.6°F | 87.3°F |
| Ko Phangan | 84.4°F | 86.8°F | 87.3°F |
| Koh Lan | 84.4°F | 86.7°F | 88.0°F |
| Surat Thani | 84.4°F | 85.2°F | 86.0°F |
| Phangan | 84.4°F | 86.7°F | 87.2°F |
| Jomtien | 84.3°F | 86.2°F | 87.7°F |
| Pattaya | 84.3°F | 86.2°F | 87.7°F |
| Chumphon | 84.0°F | 85.3°F | 86.9°F |
| Cha-am | 83.1°F | 85.2°F | 86.9°F |
| Hua Hin | 83.0°F | 85.1°F | 86.8°F |
| Prachuap Khiri Khan | 83.0°F | 85.4°F | 86.7°F |
| Bangkok | 82.9°F | 84.5°F | 86.4°F |
Please see following sea water temperature averages charts for the warmest Thailand resorts in December.
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.
Thailand Resorts:
NAME
F°
| Bang Tao Beach |  |
+78 |
| Bangkok | |
+80 |
| Hua Hin | |
+76 |
| Karon Beach | |
+78 |
| Kata Beach | |
+78 |
| Khao Lak | |
+78 |
| Ko Li Pe |  |
+82 |
| Koh Chang |  |
+80 |
| Patong Beach | |
+78 |
| Pattaya | |
+78 |
| Phi Phi | |
+82 |
| Phuket | |
+78 |
| Samet | |
+78 |
| Samui |  |
+84 |
| Similan | |
+78 |
