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Planning a trip to Halong Bay in September? This guide covers everything you need to know about the weather in Halong Bay in September, including temperature, rainfall, travel tips, and packing suggestions.
Weather in Halong Bay in September
September marks the end of the summer months in Halong Bay, bringing slightly cooler temperatures compared to July and August. The average temperature in Halong Bay in September is around 28°C (82°F), with highs that may reach 31°C (88°F) and lows that might drop to 24°C (75°F).
Humidity in Halong Bay drops to around 72%, so you’ll feel more comfortable than in peak summer. However, rain remaains common, with around 14 rainy days during the month.
September is also the end of Vietnam’s typhoon season. Although storms are less frequent than in others summer months, it’s still likely to encounter at least one or two and especially very strong. For example, Typhoon Yagi in 2024 brought heavy rain and strong winds to Northern Vietnam, including Halong Bay.
Historical weather data in September
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
1 28°C |
2 28.5°C |
3 28.5°C |
4 28°C |
5 28°C |
6 28°C |
7 28°C |
| 8 28°C |
9 28°C |
10 28°C |
11 28°C |
12 28°C |
13 28°C |
14 28°C |
| 15 27.5°C |
16 27.5°C |
17 27.5°C |
18 27.5°C |
19 27.5°C |
20 27.5°C |
21 27.5°C |
| 22 27.5°C |
23 27.5°C |
24 27.5°C |
25 26.5°C |
26 26.5°C |
27 26.5°C |
28 26.5°C |
| 29 26.5°C |
30 26.5°C |
What to pack in September
Pack light, breathable summer clothes since it’s still the summer season in Halong Bay. Don’t forget hats, sunglasses, and sunscreen to protect yourself from UV radiation on sunny days.
Since you might encounter some rain, prepare by bringing a light rain jacket, as well as waterproof shoes or sandals to keep you dry.
Tips for visiting Halong Bay in September
September 2nd is Vietnam’s National Independence Day. Try to avoid traveling on this day and the 1–2 surrounding days to avoid holiday surcharges and crowds.
If you’re in Halong Bay during the holiday, head into the city for concerts, fireworks, and public celebrations.
September is the final month of the low travel season in Halong Bay, so except for the national holiday, you’ll likely find good deals on cruises and services.
