There is no single best month for diving in Vietnam. The central coast (Nha Trang, Cham Islands) and Con Dao are best from about March into the summer, while Phu Quoc in the south is best from about November to May. March to May is the overlap when you can combine both.
Month by month
| Region | Best months | Avoid | Notes |
|---|---|---|---|
| Nha Trang | Mar–Oct | Nov–Jan | Clearest water usually Jun–Jul |
| Phu Quoc | Nov–May | Jul–Sep (poorer visibility) | Calm dry-season seas |
| Con Dao | Mar–Sep | Oct–Feb | Rough seas, cancellations off season |
| Cham Islands | Late Mar–Aug | Monsoon months | Access restricted in monsoon |
Sources: several dive guides (Rough Guides, Vietnam National Authority of Tourism and dive operators); they differ by a few weeks, so confirm conditions with your operator before booking.
Combining coasts: fly into Ho Chi Minh City in March–May, dive Phu Quoc first, then head up to Nha Trang. Both are usually in season.
Water temperature
The water stays warm all year – roughly 26–30°C depending on region and season. A 3 mm wetsuit or a long rash guard is usually enough.
Frequently asked questions
What months should I avoid for diving in Vietnam?
September to November is the stormiest stretch for both coasts. On the central coast, November to January is also poor.
Can I dive both Nha Trang and Phu Quoc on one trip?
Yes, March to May is the overlap when both are usually diveable.
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