The Cambodia resorts with the warmest sea water temperature in September are Koh Dek Koule, Koh Rong and Sihanoukville.
Below you can see a list of all popular Cambodia resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Koh Dek Koule | 87.9°F | 88.5°F | 88.2°F |
| Koh Rong | 87.9°F | 88.4°F | 88.1°F |
| Sihanoukville | 87.8°F | 88.5°F | 88.2°F |
| Koh Kong | 87.5°F | 88.2°F | 87.7°F |
Please see following sea water temperature averages charts for the warmest Cambodia 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.
Cambodia Resorts:
NAME
F°
| Battambang |  |
+90 |
| Koh Dek Koule | |
+86 |
| Koh Kong |  |
+90 |
| Koh Rong | |
+86 |
| Phnom Penh |  |
+92 |
| Siem Reap | |
+88 |
| Sihanoukville | |
+86 |
