Ha Long Weather in September

September weather

September in Ha Long stays hot and sticky, with highs around 30°C and nights near 25°C. Rain falls on many days, and thick cloud can make the bay feel grey rather than sunny. August is wetter, but September still brings frequent showers and only a few hours of sun each day.

You can still enjoy a cruise among Ha Long Bay's limestone islands when the weather allows. On wet days, explore the indoor exhibits at Quang Ninh Museum or settle in for a bowl of chả mực, the local fried squid cake. Don't count on a full day at the beach, and keep your plans flexible: rough weather can disrupt boat trips.

Crowds and events

September is quieter than the busy summer holiday period, and demand often eases as families return to school. It's also outside the December-to-February period that's best overall for visiting. You may find better-value stays than in peak months, though prices vary and rain can affect cruise availability.

Vietnam's National Day falls on September 2. It's a public holiday, so local travel can pick up around the date, even in a generally quieter month. Check whether your visit overlaps before choosing a cruise departure.

A practical tip

For travellers who'd rather trade beach time for calmer sightseeing, September can work well—just leave room for a change of plans.

If you're taking a cruise, ask whether it leaves from Tuan Chau International Marina and how the operator handles weather cancellations. A cancelled boat day is easier to manage when you've kept time for Ha Long City's museums or a meal near Bai Chay. Don't head to the pier assuming a rainy forecast means boats will sail; conditions on the bay matter.