The Thailand resorts with the warmest sea water temperature in September are Ko Li Pe, Phi Phi and Hat Yai.
Below you can see a list of all popular Thailand resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2019 | September 2018 | September 2017 |
|---|---|---|---|
| Ko Li Pe | 89.8°F | 89.4°F | 90.1°F |
| Phi Phi | 89.6°F | 89.1°F | 89.7°F |
| Hat Yai | 89.5°F | 89.6°F | 90.8°F |
| Koh Lanta | 89.4°F | 89.1°F | 89.4°F |
| Krabi | 89.2°F | 88.9°F | 89.6°F |
| Cape Panwa | 89.1°F | 88.8°F | 89.5°F |
| Pattani | 89.0°F | 89.2°F | 90.0°F |
| Nai Harn Beach | 88.9°F | 88.7°F | 89.4°F |
| Rawai Beach | 88.9°F | 88.7°F | 89.4°F |
| Bangkok | 88.8°F | 88.9°F | 90.8°F |
| Narathiwat | 88.8°F | 89.3°F | 89.8°F |
| Kata Beach | 88.8°F | 88.7°F | 89.3°F |
| Karon Beach | 88.8°F | 88.7°F | 89.3°F |
| Phuket | 88.7°F | 88.5°F | 89.3°F |
| Patong Beach | 88.7°F | 88.6°F | 89.2°F |
| Kalim Beach | 88.7°F | 88.6°F | 89.2°F |
| Surin Beach | 88.6°F | 88.5°F | 89.2°F |
| Cha-am | 88.6°F | 88.6°F | 91.1°F |
| Bang Tao Beach | 88.6°F | 88.5°F | 89.2°F |
| Kamala Beach | 88.6°F | 88.5°F | 89.2°F |
| Nai Yang Beach | 88.5°F | 88.4°F | 89.2°F |
| Hua Hin | 88.5°F | 88.4°F | 90.9°F |
| Koh Lan | 88.5°F | 88.6°F | 90.4°F |
| Taling Ngam Beach | 88.5°F | 88.7°F | 90.0°F |
| Lamai Beach | 88.4°F | 88.8°F | 90.0°F |
| Jomtien | 88.4°F | 88.4°F | 90.3°F |
| Mai Khao Beach | 88.4°F | 88.3°F | 89.2°F |
| Pattaya | 88.4°F | 88.5°F | 90.4°F |
| Chaweng Beach | 88.4°F | 88.7°F | 90.0°F |
| Samui | 88.3°F | 88.7°F | 89.9°F |
| Mae Nam Beach | 88.3°F | 88.6°F | 89.9°F |
| Choeng Mon Beach | 88.3°F | 88.7°F | 89.9°F |
| Bo Phut Beach | 88.3°F | 88.6°F | 89.9°F |
| Surat Thani | 88.2°F | 88.2°F | 89.7°F |
| Ko Phangan | 88.2°F | 88.5°F | 89.8°F |
| Phangan | 88.1°F | 88.5°F | 89.8°F |
| Rayong | 88.0°F | 88.6°F | 90.0°F |
| Tao | 88.0°F | 88.3°F | 89.4°F |
| Samet | 87.9°F | 88.2°F | 90.0°F |
| Khao Lak | 87.7°F | 87.5°F | 88.7°F |
| Chumphon | 87.7°F | 87.7°F | 89.3°F |
| Trat | 87.7°F | 87.9°F | 89.4°F |
| Prachuap Khiri Khan | 87.7°F | 87.8°F | 89.7°F |
| Koh Chang | 87.6°F | 87.9°F | 89.4°F |
| Ko Wai | 87.5°F | 87.9°F | 89.4°F |
| Ko Mak | 87.5°F | 87.9°F | 89.3°F |
| Koh Kood | 87.5°F | 87.7°F | 89.2°F |
| Similan | 87.4°F | 87.2°F | 88.1°F |
Please see following sea water temperature averages charts for the warmest Thailand resorts in September.
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°
| Bangkok |  |
+96 |
| Chumphon | |
+90 |
| Hua Hin |  |
+90 |
| Koh Chang | |
+88 |
| Krabi | |
+90 |
| Narathiwat | |
+88 |
| Pattani |  |
+88 |
| Pattaya | |
+90 |
| Phi Phi |  |
+84 |
| Phuket | |
+88 |
| Prachuap Khiri Khan |  |
+88 |
| Rayong | |
+90 |
| Samet | |
+90 |
| Samui | |
+88 |
| Surat Thani | |
+96 |
