Ha Long Bay in September: Weather, Cruises & Travel Tips

Ha Long Bay in September is a mix of tropical warmth, emerald waters, and moody skies as the summer fades and autumn begins. While the month is still part of the rainy season, storms are less frequent than in August, and the cooler breezes make cruising more comfortable. It’s a transitional month — sometimes sunny and calm, other times misty and dramatic — giving Ha Long Bay a special charm.

Weather in Ha Long Bay in September

• Average daytime temperature: 25–31°C (77–88°F)
• Night temperature: 22–26°C (72–79°F)
• Rainfall: ~250–300 mm across 12–14 days
• Humidity: 80–85%
• Sea temperature: ~28°C (82°F)

Weather verdict: September is warm and humid with occasional showers, but seas are usually calmer compared to peak storm season. A great time for budget travelers as prices are lower before the high season.

Why Visit Ha Long Bay in September

• Fewer crowds – quieter than summer and the upcoming October–December peak season.
• Lower prices – discounts on cruises and hotels.
• Lush scenery – rain enhances the greenery of the islands.
• Comfortable temperatures – still warm enough for swimming and kayaking.

Best Things to Do in Ha Long Bay in September

Seasonal Highlights

1. Overnight Cruise – Watch misty sunrises and sunsets on the bay.
2. Kayaking & Swimming – Warm seas perfect for water activities.
3. Ti Top Island – Hike to the viewpoint for panoramic photos.
4. Lan Ha Bay & Bai Tu Long Bay – Quieter alternatives with equally stunning scenery.

Year-Round Experiences

• Explore Sung Sot Cave and Thien Cung Cave.
• Enjoy fresh seafood on board.
• Take a sunset deck party during clear evenings.

Festivals & Events in September

• Mid-Autumn Festival (Tết Trung Thu) – Lantern parades, mooncakes, and children’s celebrations light up Ha Long City if your trip coincides with this lunar holiday.

What to Pack for Ha Long Bay in September

• Light, breathable clothing for warm days.
• Swimwear – water is still perfect for swimming.
• Rain jacket or umbrella – afternoon showers are common.
• Non-slip shoes or sandals – useful for island hikes.
• Waterproof bag – to protect electronics during boat rides.

Suggested Itinerary for September

2 Days / 1 Night Cruise

• Day 1: Hanoi → Ha Long Bay, kayaking and cave visit, sunset on deck.
• Day 2: Morning Tai Chi, Ti Top Island hike, return to Hanoi.

3 Days / 2 Nights Cruise

• Adds visits to Lan Ha Bay or Bai Tu Long Bay for more secluded experiences.

Travel Tips for September in Ha Long Bay

• Check weather forecasts — September can still bring the occasional storm.
• Book with reliable cruise operators who adjust itineraries for safety.
• Be flexible — plans may shift due to rain, but the moody skies make for epic photos.
• Bring motion sickness tablets if you’re sensitive — seas can be choppy on stormy days.

Related Guides (Internal Links)

• Vietnam in September – Weather & Best Places to Visit
• Hanoi in September
• Sapa in September
• Ha Giang in September
• Ninh Binh in September
• Full Ha Long Bay Travel Guide