Weather: Ha Long Bay — September
The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.
🌟 Climate Overview
September is an excellent time to visit Ha Long Bay. Hot conditions with temperatures reaching 31°C—stay hydrated and seek shade. This is one of the wettest months—waterproof gear is essential. As peak season, expect higher prices and more tourists. Sea temperature of 30°C is perfect for swimming.
Based on weather comfort, crowds, prices, and activity options
31°C
26°C
26days
12.3h
Feels like 38°C / 32°C — humidity makes it feel warmer
366mm
7.8h/day
84%
Very Muggy6
High14 km/h (gusts 30)
30°C 🏊 Comfortable
Is September a good time to visit Ha Long Bay?
The weather is near-perfect with ideal temperatures and minimal rain.
Now
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Air Quality
Travel Context
- CrowdsVery Busy
- Travel Costs Value Rates
Daylight
05:39
17:56
Visiting Ha Long Bay in September: Pros & Cons
Pros
- Warm sea perfect for swimming and snorkeling
- One of the best months to visit
Cons
- Frequent rain may disrupt outdoor activities
- Peak season — expect crowds and higher prices
- High humidity makes the heat feel oppressive
Things to Do in September
Events & Festivals
Recommended for This Weather
Ha Long Bay Weather by Month
| Month | Avg High | Avg Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition |
|---|---|---|---|---|---|---|---|---|
| Jan | 21°C | 16°C | 7d (34mm) | 6.4h | 76% Humid | 4.1 Moderate | | Good |
| Feb | 21°C | 17°C | 6d (33mm) | 5.7h | 82% Very Humid | 4.4 Moderate | | Good |
| Mar | 24°C | 20°C | 10d (31mm) | 6.7h | 84% Very Humid | 5.3 High | | Excellent |
| Apr | 27°C | 23°C | 11d (59mm) | 8.7h | 83% Very Humid | 6.8 High | | Excellent |
| May | 31°C | 26°C | 20d (154mm) | 9.7h | 83% Very Muggy | 7.4 Very High | | Excellent |
| Jun | 33°C | 28°C | 22d (271mm) | 8.7h | 82% Very Muggy | 7.3 Very High | | Wet |
| Jul | 33°C | 28°C | 23d (280mm) | 9.7h | 83% Very Muggy | 7.7 Very High | | Wet |
| Aug | 32°C | 27°C | 28d (400mm) | 7.7h | 85% Very Muggy | 6.4 High | | Wet |
| Sep Current | 31°C | 26°C | 26d (366mm) | 7.8h | 84% Very Muggy | 6 High | | Excellent |
| Oct | 29°C | 23°C | 14d (156mm) | 8.1h | 76% Muggy | 5.9 High | | Excellent |
| Nov | 27°C | 21°C | 7d (32mm) | 8.4h | 74% Humid | 5.3 High | | Excellent |
| Dec | 22°C | 17°C | 3d (12mm) | 7.1h | 69% Humid | 4.4 Moderate | | Good |
Ha Long Bay
UNESCO World Heritage Bay with 1,600 limestone karst islands rising dramatically from emerald waters, overnight junk boat cruises, kayaking through caves, floating villages, and one of Vietnam's most iconic natural wonders.
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What to Pack for September
Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool. A waterproof jacket and shoes are non-negotiable — showers are frequent. Don't forget a wide-brimmed hat and high-SPF sunscreen — the sun is strong.
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Frequently Asked Questions
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More Ha Long Bay Guides
Best Time to Visit
Coming soon
Things to Do
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Where to Stay
Best neighborhoods and hotel recommendations
Cost & Budget
Daily costs, money-saving tips, and budget breakdown
Itineraries
Coming soon
Overview
Complete travel guide for Ha Long Bay: top things to do, itineraries, and typical costs.