In September warmest sea in Gulf of Thailand is usually observed in the following locations: Cha-am, Hua Hin, Bangkok.
Table below shows the average sea water temperature for marine resorts of Gulf of Thailand in September for the last three years.
| Place name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Cha-am | 85.2°F | 86.0°F | 85.7°F |
| Hua Hin | 85.2°F | 86.0°F | 85.3°F |
| Bangkok | 84.9°F | 85.8°F | 85.5°F |
| Koh Lan | 84.9°F | 86.0°F | 85.7°F |
| Pattaya | 84.8°F | 85.7°F | 85.5°F |
| Jomtien | 84.7°F | 85.7°F | 85.4°F |
| Rayong | 84.5°F | 85.5°F | 84.7°F |
| Koh Chang | 84.4°F | 85.0°F | 84.8°F |
| Samet | 84.3°F | 85.3°F | 84.5°F |
| Ko Wai | 84.3°F | 85.0°F | 84.9°F |
| Ko Mak | 84.3°F | 85.1°F | 84.8°F |
| Koh Kood | 84.2°F | 85.1°F | 84.6°F |
| Trat | 84.2°F | 84.5°F | 84.7°F |
| Prachuap Khiri Khan | 84.1°F | 85.2°F | 84.5°F |
| Koh Rong | 84.1°F | 84.6°F | 84.3°F |
| Koh Kong | 83.7°F | 84.4°F | 83.9°F |
Charts below show average sea water temperature for Gulf of Thailand resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of Gulf of Thailand resorts at that time.
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