The Thailand resorts with the warmest sea water temperature in May are Samet, Trat and Rayong.
Below you can see a list of all popular Thailand resorts and information about sea water temperature in May for the last two years.
| Resort Name | May 2025 | May 2024 | May 2023 |
|---|---|---|---|
| Samet | 92.2°F | 93.4°F | 92.4°F |
| Trat | 92.2°F | 93.7°F | 93.0°F |
| Rayong | 92.1°F | 93.5°F | 92.5°F |
| Ko Wai | 92.0°F | 93.8°F | 92.5°F |
| Ko Mak | 92.0°F | 93.6°F | 92.3°F |
| Koh Kood | 91.9°F | 93.6°F | 92.4°F |
| Koh Chang | 91.8°F | 94.1°F | 92.7°F |
| Hua Hin | 91.8°F | 92.9°F | 92.6°F |
| Cha-am | 91.8°F | 93.2°F | 92.9°F |
| Hat Yai | 91.5°F | 93.9°F | 92.2°F |
| Bangkok | 91.5°F | 92.8°F | 92.4°F |
| Jomtien | 91.4°F | 93.1°F | 92.1°F |
| Koh Lan | 91.4°F | 93.1°F | 92.1°F |
| Pattaya | 91.4°F | 93.1°F | 92.2°F |
| Phangan | 91.4°F | 93.1°F | 92.1°F |
| Ko Phangan | 91.3°F | 93.1°F | 91.9°F |
| Chumphon | 91.3°F | 93.5°F | 91.9°F |
| Lamai Beach | 91.3°F | 93.3°F | 91.3°F |
| Pattani | 91.3°F | 92.9°F | 91.6°F |
| Samui | 91.3°F | 93.3°F | 91.4°F |
| Taling Ngam Beach | 91.3°F | 93.6°F | 91.6°F |
| Chaweng Beach | 91.2°F | 93.3°F | 91.4°F |
| Choeng Mon Beach | 91.2°F | 93.3°F | 91.4°F |
| Bo Phut Beach | 91.2°F | 93.3°F | 91.5°F |
| Mae Nam Beach | 91.2°F | 93.3°F | 91.5°F |
| Tao | 91.2°F | 92.9°F | 91.7°F |
| Surat Thani | 91.2°F | 92.4°F | 91.7°F |
| Narathiwat | 91.1°F | 92.7°F | 91.3°F |
| Cape Panwa | 91.1°F | 92.8°F | 91.4°F |
| Ko Li Pe | 91.0°F | 92.9°F | 91.5°F |
| Prachuap Khiri Khan | 90.8°F | 92.6°F | 91.4°F |
| Krabi | 90.8°F | 92.8°F | 91.9°F |
| Phi Phi | 90.8°F | 93.0°F | 91.5°F |
| Nai Harn Beach | 90.8°F | 92.5°F | 91.1°F |
| Rawai Beach | 90.8°F | 92.5°F | 91.1°F |
| Kata Beach | 90.7°F | 92.5°F | 91.1°F |
| Karon Beach | 90.7°F | 92.5°F | 91.1°F |
| Koh Lanta | 90.6°F | 93.3°F | 92.1°F |
| Patong Beach | 90.6°F | 92.5°F | 91.2°F |
| Phuket | 90.6°F | 92.6°F | 91.5°F |
| Kalim Beach | 90.6°F | 92.4°F | 91.3°F |
| Surin Beach | 90.5°F | 92.4°F | 91.4°F |
| Kamala Beach | 90.5°F | 92.4°F | 91.4°F |
| Bang Tao Beach | 90.5°F | 92.4°F | 91.4°F |
| Nai Yang Beach | 90.4°F | 92.3°F | 91.5°F |
| Mai Khao Beach | 90.4°F | 92.2°F | 91.4°F |
| Similan | 90.4°F | 91.9°F | 91.2°F |
| Khao Lak | 90.1°F | 91.4°F | 91.2°F |
Please see following sea water temperature averages charts for the warmest Thailand resorts in May.
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 |  |
+88 |
| Bangkok |  |
+82 |
| Karon Beach | |
+88 |
| Kata Beach | |
+88 |
| Khao Lak | |
+84 |
| Ko Li Pe | |
+84 |
| Koh Chang | |
+84 |
| Krabi | |
+86 |
| Patong Beach | |
+88 |
| Pattaya |  |
+88 |
| Phi Phi | |
+84 |
| Phuket | |
+88 |
| Samet | |
+84 |
| Samui | |
+84 |
| Similan | |
+84 |
