In September warmest sea in Thailand is usually observed in the following locations: Hat Yai, Narathiwat, Ko Li Pe.
Table below shows the average sea water temperature for marine resorts of Thailand in September for the last three years.
| Place name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Hat Yai | 86.0°F | 85.8°F | 85.8°F |
| Narathiwat | 85.9°F | 85.7°F | 85.6°F |
| Ko Li Pe | 85.8°F | 85.7°F | 85.8°F |
| Pattani | 85.5°F | 85.6°F | 85.6°F |
| Cha-am | 85.2°F | 86.0°F | 85.7°F |
| Hua Hin | 85.2°F | 86.0°F | 85.3°F |
| Lamai Beach | 85.1°F | 85.8°F | 85.1°F |
| Taling Ngam Beach | 85.0°F | 85.5°F | 85.1°F |
| Chaweng Beach | 85.0°F | 85.7°F | 85.0°F |
| Bangkok | 84.9°F | 85.8°F | 85.5°F |
| Samui | 84.9°F | 85.6°F | 85.0°F |
| Koh Lan | 84.9°F | 86.0°F | 85.7°F |
| Koh Lanta | 84.9°F | 84.7°F | 85.1°F |
| Choeng Mon Beach | 84.9°F | 85.6°F | 84.9°F |
| Bo Phut Beach | 84.9°F | 85.5°F | 84.9°F |
| Mae Nam Beach | 84.9°F | 85.5°F | 84.9°F |
| Krabi | 84.8°F | 85.1°F | 85.1°F |
| Pattaya | 84.8°F | 85.7°F | 85.5°F |
| Phi Phi | 84.8°F | 85.0°F | 85.2°F |
| Ko Phangan | 84.7°F | 85.4°F | 84.8°F |
| Phangan | 84.7°F | 85.4°F | 84.8°F |
| Jomtien | 84.7°F | 85.7°F | 85.4°F |
| Tao | 84.6°F | 85.4°F | 84.6°F |
| Surat Thani | 84.6°F | 84.7°F | 84.6°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 |
| Cape Panwa | 84.3°F | 84.8°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 |
| Rawai Beach | 84.1°F | 84.5°F | 84.8°F |
| Nai Harn Beach | 84.1°F | 84.5°F | 84.8°F |
| Phuket | 84.0°F | 84.6°F | 84.8°F |
| Mai Khao Beach | 84.0°F | 84.4°F | 84.7°F |
| Nai Yang Beach | 84.0°F | 84.5°F | 84.7°F |
| Kata Beach | 84.0°F | 84.6°F | 84.8°F |
| Karon Beach | 84.0°F | 84.6°F | 84.8°F |
| Surin Beach | 84.0°F | 84.6°F | 84.8°F |
| Kamala Beach | 84.0°F | 84.6°F | 84.8°F |
| Bang Tao Beach | 84.0°F | 84.6°F | 84.8°F |
| Kalim Beach | 84.0°F | 84.6°F | 84.8°F |
| Patong Beach | 83.9°F | 84.6°F | 84.8°F |
| Chumphon | 83.9°F | 84.8°F | 84.4°F |
| Khao Lak | 83.7°F | 83.8°F | 84.1°F |
| Similan | 83.3°F | 84.0°F | 84.0°F |
Charts below show average sea water temperature for Thailand resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of Thailand resorts at that time.
Places in Thailand:
Name
°F
