The Vietnam resorts with the warmest sea water temperature in September are Thanh Hoa, Cat Ba Island and Doc Let Beach.
Below you can see a list of all popular Vietnam resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2026 | September 2025 | September 2024 |
|---|---|---|---|
| Thanh Hoa | 89.3°F | 89.9°F | 89.8°F |
| Cat Ba Island | 89.2°F | 89.7°F | 90.0°F |
| Doc Let Beach | 89.1°F | 89.4°F | 89.4°F |
| Da Nang | 89.0°F | 88.9°F | 90.2°F |
| Hoi An | 88.9°F | 88.9°F | 89.7°F |
| Ha Long | 88.9°F | 89.6°F | 89.9°F |
| Con Dao | 88.9°F | 87.7°F | 88.6°F |
| Hue | 88.7°F | 89.8°F | 90.5°F |
| Cam Ranh | 88.6°F | 88.8°F | 88.8°F |
| Tuan Chau | 88.5°F | 89.3°F | 89.7°F |
| Nha Trang | 88.5°F | 89.1°F | 89.0°F |
| Vinpearl | 88.4°F | 88.9°F | 88.9°F |
| Phu Quoc | 88.1°F | 87.7°F | 88.6°F |
| Vung Tau | 88.0°F | 87.3°F | 88.0°F |
| Ho Chi Minh | 87.6°F | 87.5°F | 87.9°F |
| Hai Phong | 87.6°F | 88.3°F | 88.8°F |
| Phan Rang | 87.3°F | 87.8°F | 87.5°F |
| Ke Ga | 87.2°F | 86.0°F | 86.3°F |
| Phan Thiet | 86.4°F | 85.7°F | 86.0°F |
| Mui Ne | 86.4°F | 85.7°F | 86.1°F |
Please see following sea water temperature averages charts for the warmest Vietnam 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.
Sea Water
Temperature
Temperature
| Thanh Hoa |
Sea Water
Temperature
Temperature
| Cat Ba Island |
Sea Water
Temperature
Temperature
| Doc Let Beach |
Vietnam Resorts:
NAME
F°
| Cam Ranh |  |
+80 |
| Da Lat |  |
+62 |
| Da Nang |  |
+78 |
| Doc Let Beach | |
+80 |
| Ha Long |  |
+70 |
| Ha Noi | |
+74 |
| Ho Chi Minh | |
+82 |
| Hoi An | |
+78 |
| Mui Ne | |
+76 |
| Nha Trang | |
+80 |
| Phan Rang | |
+80 |
| Phan Thiet | |
+76 |
| Phu Quoc | |
+80 |
| Vinpearl | |
+80 |
| Vung Tau | |
+76 |
