Month guide · Ha Long Bay · Vietnam
Ha Long Bay in September
What September is really like in Ha Long Bay: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Photo: AnhTuan Le, Public domain
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Quick answer
September is a shoulder-season month. Expect average highs of 30°C (86°F), lows of 25°C (77°F), about 13 rainy days and roughly 12.2 hours of daylight. Still warm and stormy early in the month, improving towards the end as the rains ease.
Key facts
- Average high / low
- 30°C (86°F) / 25°C (77°F)
- Rainy days
- About 13
- Daylight
- About 12.2 hours
- Sea temperature
- 28°C (82°F)
- Crowds
- Moderate
- Hotel prices
- Average
Weather in September
September is the 5th-warmest month in Ha Long Bay: days average 30°C (86°F) against a yearly average high of 26°C (79°F), and nights fall to about 25°C (77°F). Rain falls on roughly 13 of its 30 days. Compared with August (31°C (88°F)), September is about as warm; by October highs drop to around 28°C (82°F).
- Sunrise (15 September)
- About 05:38
- Sunset (15 September)
- About 17:54
- Daylight
- About 12.2 hours
- Sea
- 28°C (82°F)
Autumn (September–November). Storms fade through September, leaving dry, clear and warm weather in October and November, the best time for views.
Crowds and prices
On a 1–5 scale, September rates 3 for crowds (the peak is July at 5) and 3 for hotel prices (highest in July). Prices sit in the middle of the year's range.
Events in September
- National Day holiday — busy domestic travel (2 September)
Dates move from year to year. Check the organiser’s site before booking travel around an event.
What to do in September
With frequent rain, plan around indoor sights and keep outdoor time flexible.
Park · Cat Ba Island
Cat Ba National Park
Wear proper shoes; the path to Ngu Lam is rocky and steep near the top. Bring water, as there are few stalls on the trail.
- Time needed
- 2–3 hours
- Cost
- Low cost
- Nature
- Active
- Outdoors
- Views
Historic site · Cat Ba Town
Cannon Fort
A hilltop fortification above Cat Ba Town with gun emplacements and tunnels used by French and later Vietnamese forces.
- Time needed
- 1–1.5 hours
- Cost
- Low cost
- Views
- History
- Photo spot
Viewpoint · Hon Gai
Bai Tho Mountain
Go in the late afternoon for softer light, and ask locally which path is open, as access has varied over the years.
- Time needed
- 1.5 hours
- Cost
- Free
- Views
- Free
- History
- Active
Theme park · Bai Chay
Sun World Ha Long
A large entertainment complex in Bai Chay with the Queen Cable Car crossing the water to Ba Deo hill, the Sun Wheel observation wheel, a mountain theme park with rides and a Japanese-style garden, plus a water park on the seafront.
- Time needed
- Half a day
- Cost
- Mid-priced
- Kids
- Views
- After dark
The sea averages 28°C (82°F) — warm enough to swim. Best beaches near Ha Long Bay.
What to pack
For highs near 30°C, lows near 25°C and 13 wet days: light, breathable clothes, a sun hat and high-factor sunscreen; a compact umbrella and waterproof shoes — rain is frequent; comfortable walking shoes.
Is September a good time to visit Ha Long Bay?
A shoulder-season month, with a notable event on the calendar. If your dates are flexible, April–May and October–November are better overall. Compare every month.
Ha Long Bay in other months
Questions travellers ask
+Is September a good time to visit Ha Long Bay?
It is a shoulder-season month. Still warm and stormy early in the month, improving towards the end as the rains ease.
+How warm is Ha Long Bay in September?
Average highs are around 30°C (86°F) and lows around 25°C (77°F).
+Does it rain a lot in Ha Long Bay in September?
Expect rain on about 13 days of the month, so pack for wet weather.