The Vietnam resorts with the warmest sea water temperature in September are Thanh Hoa, Cat Ba Island and Ha Long.
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 | 89.9°F | 89.9°F | 89.8°F |
| Cat Ba Island | 89.5°F | 89.7°F | 90.0°F |
| Ha Long | 89.4°F | 89.6°F | 89.9°F |
| Da Nang | 89.4°F | 88.9°F | 90.2°F |
| Hoi An | 89.4°F | 88.9°F | 89.7°F |
| Tuan Chau | 89.2°F | 89.3°F | 89.7°F |
| Hue | 89.1°F | 89.8°F | 90.5°F |
| Doc Let Beach | 89.1°F | 89.4°F | 89.4°F |
| Con Dao | 88.8°F | 87.7°F | 88.6°F |
| Hai Phong | 88.4°F | 88.3°F | 88.8°F |
| Nha Trang | 88.3°F | 89.1°F | 89.0°F |
| Phu Quoc | 88.1°F | 87.7°F | 88.6°F |
| Vinpearl | 88.1°F | 88.9°F | 88.9°F |
| Cam Ranh | 87.8°F | 88.8°F | 88.8°F |
| Vung Tau | 87.7°F | 87.3°F | 88.0°F |
| Ho Chi Minh | 87.4°F | 87.5°F | 87.9°F |
| Ke Ga | 86.2°F | 86.0°F | 86.3°F |
| Phan Rang | 85.9°F | 87.8°F | 87.5°F |
| Phan Thiet | 85.1°F | 85.7°F | 86.0°F |
| Mui Ne | 85.0°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.
Vietnam Resorts:
NAME
F°
| Cam Ranh |  |
+84 |
| Da Lat |  |
+64 |
| Da Nang |  |
+84 |
| Doc Let Beach |  |
+84 |
| Ha Long | |
+78 |
| Ha Noi | |
+78 |
| Ho Chi Minh | |
+86 |
| Hoi An | |
+84 |
| Mui Ne | |
+80 |
| Nha Trang | |
+84 |
| Phan Rang | |
+84 |
| Phan Thiet | |
+80 |
| Phu Quoc | |
+84 |
| Vinpearl | |
+84 |
| Vung Tau | |
+80 |
