The Thailand resorts with the warmest sea water temperature in September are Hat Yai, Ko Li Pe and Koh Lan.
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 2023 | September 2022 | September 2021 |
|---|---|---|---|
| Hat Yai | 89.8°F | 89.6°F | 89.8°F |
| Ko Li Pe | 89.7°F | 88.9°F | 89.7°F |
| Koh Lan | 89.7°F | 89.4°F | 88.7°F |
| Cha-am | 89.7°F | 89.6°F | 88.9°F |
| Pattani | 89.6°F | 89.2°F | 89.2°F |
| Narathiwat | 89.6°F | 89.3°F | 89.2°F |
| Bangkok | 89.4°F | 89.3°F | 88.7°F |
| Pattaya | 89.4°F | 89.1°F | 88.6°F |
| Jomtien | 89.4°F | 89.1°F | 88.6°F |
| Hua Hin | 89.3°F | 89.7°F | 88.8°F |
| Phi Phi | 89.1°F | 89.1°F | 89.0°F |
| Krabi | 89.0°F | 89.2°F | 88.7°F |
| Koh Lanta | 89.0°F | 88.9°F | 88.4°F |
| Lamai Beach | 89.0°F | 89.7°F | 89.2°F |
| Taling Ngam Beach | 89.0°F | 89.8°F | 89.1°F |
| Chaweng Beach | 88.9°F | 89.6°F | 89.2°F |
| Samui | 88.9°F | 89.6°F | 89.2°F |
| Bo Phut Beach | 88.8°F | 89.6°F | 89.1°F |
| Mae Nam Beach | 88.8°F | 89.6°F | 89.1°F |
| Choeng Mon Beach | 88.8°F | 89.6°F | 89.1°F |
| Ko Wai | 88.8°F | 87.8°F | 87.6°F |
| Cape Panwa | 88.7°F | 89.1°F | 88.9°F |
| Koh Chang | 88.7°F | 88.0°F | 87.6°F |
| Phangan | 88.7°F | 89.5°F | 89.1°F |
| Ko Mak | 88.6°F | 87.7°F | 87.7°F |
| Phuket | 88.6°F | 89.0°F | 88.7°F |
| Kalim Beach | 88.6°F | 89.0°F | 88.6°F |
| Bang Tao Beach | 88.6°F | 89.0°F | 88.7°F |
| Kamala Beach | 88.6°F | 89.0°F | 88.7°F |
| Patong Beach | 88.6°F | 89.0°F | 88.7°F |
| Surin Beach | 88.6°F | 89.0°F | 88.7°F |
| Nai Harn Beach | 88.6°F | 89.0°F | 88.7°F |
| Rawai Beach | 88.6°F | 89.0°F | 88.7°F |
| Karon Beach | 88.6°F | 89.0°F | 88.7°F |
| Kata Beach | 88.6°F | 89.0°F | 88.7°F |
| Ko Phangan | 88.6°F | 89.5°F | 89.1°F |
| Nai Yang Beach | 88.6°F | 88.9°F | 88.5°F |
| Rayong | 88.6°F | 89.0°F | 88.1°F |
| Trat | 88.6°F | 87.7°F | 87.2°F |
| Mai Khao Beach | 88.5°F | 88.8°F | 88.5°F |
| Koh Kood | 88.5°F | 87.7°F | 87.9°F |
| Surat Thani | 88.4°F | 88.8°F | 88.4°F |
| Tao | 88.4°F | 89.6°F | 88.9°F |
| Samet | 88.4°F | 88.8°F | 87.8°F |
| Prachuap Khiri Khan | 88.3°F | 88.9°F | 88.2°F |
| Chumphon | 88.2°F | 88.8°F | 88.4°F |
| Khao Lak | 87.9°F | 88.4°F | 87.8°F |
| Similan | 87.8°F | 88.3°F | 87.8°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°
| Bang Tao Beach |  |
+90 |
| Bangkok |  |
+100 |
| Hua Hin | |
+92 |
| Karon Beach | |
+90 |
| Kata Beach | |
+90 |
| Khao Lak |  |
+90 |
| Koh Chang | |
+90 |
| Krabi | |
+90 |
| Patong Beach | |
+90 |
| Pattaya | |
+92 |
| Phangan | |
+90 |
| Phi Phi | |
+90 |
| Phuket | |
+90 |
| Samet | |
+90 |
| Samui | |
+90 |
