The Vietnam resorts with the warmest sea water temperature in September are Thanh Hoa, Hue and Cat Ba Island.
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 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Thanh Hoa | 89.9°F | 89.8°F | 90.4°F |
| Hue | 89.8°F | 90.5°F | 90.0°F |
| Cat Ba Island | 89.7°F | 90.0°F | 90.1°F |
| Ha Long | 89.6°F | 89.9°F | 89.9°F |
| Doc Let Beach | 89.4°F | 89.4°F | 90.2°F |
| Tuan Chau | 89.3°F | 89.7°F | 89.7°F |
| Nha Trang | 89.1°F | 89.0°F | 89.5°F |
| Da Nang | 88.9°F | 90.2°F | 89.8°F |
| Vinpearl | 88.9°F | 88.9°F | 89.3°F |
| Hoi An | 88.9°F | 89.7°F | 89.5°F |
| Cam Ranh | 88.8°F | 88.8°F | 89.4°F |
| Hai Phong | 88.3°F | 88.8°F | 88.5°F |
| Phan Rang | 87.8°F | 87.5°F | 87.7°F |
| Phu Quoc | 87.7°F | 88.6°F | 88.1°F |
| Con Dao | 87.7°F | 88.6°F | 88.4°F |
| Ho Chi Minh | 87.5°F | 87.9°F | 87.5°F |
| Vung Tau | 87.3°F | 88.0°F | 87.6°F |
| Ke Ga | 86.0°F | 86.3°F | 86.8°F |
| Mui Ne | 85.7°F | 86.1°F | 85.9°F |
| Phan Thiet | 85.7°F | 86.0°F | 86.3°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.
Vietnam Resorts:
NAME
F°
| Cam Ranh |  |
+80 |
| Cat Ba Island | |
+72 |
| Da Lat |  |
+76 |
| Da Nang |  |
+78 |
| Doc Let Beach | |
+80 |
| Ha Long |  |
+70 |
| Ha Noi | |
+68 |
| Ho Chi Minh | |
+90 |
| Mui Ne |  |
+86 |
| Nha Trang | |
+82 |
| Phan Rang | |
+80 |
| Phan Thiet | |
+86 |
| Phu Quoc | |
+88 |
| Vinpearl | |
+82 |
| Vung Tau | |
+88 |
