The Thailand resorts with the warmest sea water temperature in September are Hat Yai, Ko Li Pe and Narathiwat.
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 2018 | September 2017 | September 2016 |
|---|---|---|---|
| Hat Yai | 89.6°F | 90.8°F | 89.5°F |
| Ko Li Pe | 89.4°F | 90.1°F | 88.2°F |
| Narathiwat | 89.3°F | 89.8°F | 88.9°F |
| Pattani | 89.2°F | 90.0°F | 88.7°F |
| Phi Phi | 89.1°F | 89.7°F | 87.4°F |
| Koh Lanta | 89.1°F | 89.4°F | 87.4°F |
| Bangkok | 88.9°F | 90.8°F | 89.0°F |
| Krabi | 88.9°F | 89.6°F | 87.4°F |
| Cape Panwa | 88.8°F | 89.5°F | 87.2°F |
| Lamai Beach | 88.8°F | 90.0°F | 88.4°F |
| Nai Harn Beach | 88.7°F | 89.4°F | 87.1°F |
| Rawai Beach | 88.7°F | 89.4°F | 87.1°F |
| Chaweng Beach | 88.7°F | 90.0°F | 88.3°F |
| Taling Ngam Beach | 88.7°F | 90.0°F | 88.1°F |
| Samui | 88.7°F | 89.9°F | 88.3°F |
| Choeng Mon Beach | 88.7°F | 89.9°F | 88.3°F |
| Kata Beach | 88.7°F | 89.3°F | 87.0°F |
| Karon Beach | 88.7°F | 89.3°F | 87.0°F |
| Patong Beach | 88.6°F | 89.2°F | 87.0°F |
| Rayong | 88.6°F | 90.0°F | 88.3°F |
| Mae Nam Beach | 88.6°F | 89.9°F | 88.2°F |
| Bo Phut Beach | 88.6°F | 89.9°F | 88.2°F |
| Kalim Beach | 88.6°F | 89.2°F | 86.9°F |
| Cha-am | 88.6°F | 91.1°F | 88.9°F |
| Koh Lan | 88.6°F | 90.4°F | 88.7°F |
| Phuket | 88.5°F | 89.3°F | 87.0°F |
| Surin Beach | 88.5°F | 89.2°F | 86.9°F |
| Ko Phangan | 88.5°F | 89.8°F | 88.2°F |
| Bang Tao Beach | 88.5°F | 89.2°F | 86.9°F |
| Kamala Beach | 88.5°F | 89.2°F | 86.9°F |
| Pattaya | 88.5°F | 90.4°F | 88.6°F |
| Phangan | 88.5°F | 89.8°F | 88.1°F |
| Jomtien | 88.4°F | 90.3°F | 88.6°F |
| Hua Hin | 88.4°F | 90.9°F | 88.7°F |
| Nai Yang Beach | 88.4°F | 89.2°F | 86.9°F |
| Tao | 88.3°F | 89.4°F | 87.9°F |
| Mai Khao Beach | 88.3°F | 89.2°F | 86.9°F |
| Samet | 88.2°F | 90.0°F | 88.1°F |
| Surat Thani | 88.2°F | 89.7°F | 87.5°F |
| Koh Chang | 87.9°F | 89.4°F | 87.3°F |
| Ko Wai | 87.9°F | 89.4°F | 87.2°F |
| Trat | 87.9°F | 89.4°F | 87.3°F |
| Ko Mak | 87.9°F | 89.3°F | 87.1°F |
| Prachuap Khiri Khan | 87.8°F | 89.7°F | 87.8°F |
| Koh Kood | 87.7°F | 89.2°F | 87.0°F |
| Chumphon | 87.7°F | 89.3°F | 87.4°F |
| Khao Lak | 87.5°F | 88.7°F | 86.5°F |
| Similan | 87.2°F | 88.1°F | 86.6°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 |  |
+86 |
| Hua Hin | |
+90 |
| Koh Chang | |
+90 |
| Krabi | |
+88 |
| Narathiwat | |
+88 |
| Pattani | |
+86 |
| Pattaya | |
+88 |
| Phi Phi | |
+90 |
| Phuket | |
+88 |
| Prachuap Khiri Khan | |
+88 |
| Rayong | |
+88 |
| Samet | |
+88 |
| Samui |  |
+92 |
| Surat Thani | |
+90 |
