In September warmest sea in Vietnam is usually observed in the following locations: Thanh Hoa, Hue, Cat Ba Island.
Table below shows the average sea water temperature for marine resorts of Vietnam in September for the last three years.
| Place name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Thanh Hoa | 86.0°F | 85.8°F | 86.4°F |
| Hue | 85.8°F | 86.4°F | 86.0°F |
| Cat Ba Island | 85.7°F | 86.0°F | 86.1°F |
| Ha Long | 85.6°F | 85.9°F | 85.9°F |
| Doc Let Beach | 85.4°F | 85.5°F | 86.1°F |
| Tuan Chau | 85.3°F | 85.7°F | 85.7°F |
| Nha Trang | 85.2°F | 85.1°F | 85.5°F |
| Da Nang | 85.1°F | 86.2°F | 85.8°F |
| Vinpearl | 85.0°F | 85.0°F | 85.4°F |
| Hoi An | 85.0°F | 85.8°F | 85.6°F |
| Cam Ranh | 84.9°F | 84.9°F | 85.4°F |
| Hai Phong | 84.5°F | 84.9°F | 84.6°F |
| Phan Rang | 84.0°F | 83.8°F | 83.9°F |
| Phu Quoc | 84.0°F | 84.8°F | 84.3°F |
| Con Dao | 84.0°F | 84.7°F | 84.6°F |
| Ho Chi Minh | 83.8°F | 84.1°F | 83.7°F |
| Vung Tau | 83.6°F | 84.2°F | 83.8°F |
| Ke Ga | 82.4°F | 82.7°F | 83.1°F |
| Mui Ne | 82.1°F | 82.4°F | 82.3°F |
| Phan Thiet | 82.1°F | 82.4°F | 82.6°F |
Charts below show average sea water temperature for Vietnam resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of Vietnam resorts at that time.
Places in Vietnam:
Name
°F
