Vietnam sea temperature by month: Nha Trang, Phu Quoc, Da Nang, Mui Ne, Vung Tau
In southern and central Vietnam the sea is warm all year: the coolest is 23–25 °C in Da Nang and Nha Trang in January–February, the warmest 29–31 °C in May and summer. On Phu Quoc the water stays around 28 °C. In the north, Ha Long Bay cools to about 19–22 °C in winter.
In southern and central Vietnam the sea is warm all year. The coolest water is in January and February: about 25 °C in Nha Trang and Mui Ne and 23–24 °C in Da Nang. The warmest is May to September, at 28–31 °C. Phu Quoc is warmest in winter, around 28 °C even in winter. In the north, Ha Long Bay cools to 19–22 °C in winter — chilly for swimming.
| Month | Nha Trang | Phu Quoc | Da Nang, Hoi An | Mui Ne | Vung Tau |
|---|---|---|---|---|---|
| January | 25 | 28 | 23–24 | 25 | 26 |
| February | 25 | 28 | 23 | 25 | 26 |
| March | 26 | 29 | 24 | 26–27 | 27 |
| April | 27–28 | 30 | 25–26 | 28 | 28–29 |
| May | 29 | 30–31 | 27–28 | 29 | 29–30 |
| June | 28–29 | 30 | 29 | 28–29 | 29–30 |
| July | 28 | 29 | 29 | 28–29 | 28–29 |
| August | 28–29 | 29 | 30 | 27–29 | 28–29 |
| September | 29 | 29 | 29–30 | 28–29 | 28–29 |
| October | 28 | 29 | 28 | 28–29 | 28–29 |
| November | 27 | 28–29 | 26–27 | 27 | 28 |
| December | 25–26 | 28 | 24–25 | 26 | 27 |
Where is the sea warmest in Vietnam in winter?
Phu Quoc: from December to February the water is about 28 °C, and the west coast is calm at that time of year. Vung Tau is around 26–27 °C, Nha Trang and Mui Ne about 25 °C. Da Nang and Hoi An cool to 23–24 °C in January–February, often with waves. See Phu Quoc beaches and Nha Trang beaches.
What is the sea temperature in Nha Trang?
About 25 °C in January–February, 27–28 °C in April and 28–29 °C from May to October, cooling to 25–26 °C by December. For swimming, waves matter more than temperature: October to December is the rainy, stormy season and boat trips get cancelled, while the calmest sea is February to August. See when to go to Nha Trang.
What is the sea temperature in Da Nang and Hoi An?
Da Nang and Hoi An have the coolest water of Vietnam's main resorts: 23–24 °C in January–February. From June to September the sea is 29–30 °C — peak beach time. September to December is the rainy season. See when to go to Da Nang and Da Nang beaches.
What is the water like in Mui Ne and Vung Tau?
Mui Ne is about 25 °C in winter and 28–29 °C from April to October. December to February brings strong wind and waves — great for kitesurfing, less so for a calm swim. Vung Tau, the nearest sea to Ho Chi Minh City, is 26–30 °C all year. See Mui Ne season and wind and beaches near Ho Chi Minh City.
Can you swim in Vietnam in winter?
In the south and centre, yes: even in the coolest month the water is 23–28 °C, warmest on Phu Quoc. In the north, Ha Long Bay is about 19–22 °C from January to March, while May to October brings 27–30 °C. See when to go to Vietnam and Vietnam's beach resorts.
FAQ
What is the sea temperature in Vietnam in January? About 25 °C in Nha Trang and Mui Ne, 28 °C on Phu Quoc, 23–24 °C in Da Nang.
Where is the warmest sea in Vietnam in winter? Phu Quoc, about 28 °C.
When is the sea warmest in Vietnam? May to September, 28–31 °C.