Are there big waves in Da Nang and when is the sea calm enough to swim?

According to reports, beaches near Monkey Mountain (Son Tra) are always wave-free — the water there stays calm year-round.

One visitor noted that mornings usually have fairly calm water, while waves may pick up by evening — though nothing severe or dangerous.

Another commenter said the waves in Da Nang are pretty constant but not huge — not suited for calm swimming, but fine for playing/jumping in them.

When asked directly until what time swimming is usually calm and whether the sea can be wave-free in mid-September, there was no definite answer — waves and weather are hard to predict in advance.

Da Nang's weather is similar to Nha Trang — hot, but with more frequent and stronger wind, which often makes the sea rough for swimming.

Locals agree that sea conditions are unpredictable: the weather can be perfectly sunny while the beach still has high waves that make it impossible to swim.