Halong Bay · AutumnMonth summary
Halong Bay weather in September
✅ Good
🌡️ Temperature min / max
79°F – 86°F
🌧 Rainy days
72% of days
☀️ Sunshine
10.5h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.1/10
📅 📅 Best month
November (8.2/10)
Quick decision
Should you visit Halong Bay in September?
✅ Good
✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.
❌ No if: you're planning 100% outdoor activities — rain is frequent.
Our take: Halong Bay in September: 86°F and 10.5h of sunshine. Decent, but not the peak.
By trip type
Halong Bay in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : ✅ Low season
Local context
What to expect in September
Autumn in Halong Bay is often underrated: 30°F, golden light and declining crowds. An interesting window. With 72% of rainy days, always have indoor alternatives planned. Not the best window, but acceptable if dates are constrained. November (8.2/10) is significantly better if possible.
Browse by month
All months for Halong Bay
Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 61°F | 68°F | 28% | 0.1in | 6.7h | 7.2/10 |
| 🌤️ February | 61°F | 70°F | 29% | 0.1in | 5.3h | 7.2/10 |
| 🌤️ March | 66°F | 75°F | 34% | 0.1in | 6.0h | 7.4/10 |
| 🌤️ April | 72°F | 79°F | 41% | 0.1in | 9.2h | 7.7/10 |
| ⛅ May | 77°F | 84°F | 63% | 0.2in | 10.8h | 7.3/10 |
| ⛅ June | 81°F | 88°F | 77% | 0.3in | 10.5h | 7.0/10 |
| ⛅ July | 81°F | 88°F | 80% | 0.4in | 11.0h | 7.0/10 |
| 🌧️ August | 79°F | 86°F | 87% | 0.6in | 9.2h | 6.3/10 |
| ⛅ September | 79°F | 86°F | 72% | 0.4in | 10.5h | 7.1/10 |
| 🌤️ October | 73°F | 82°F | 38% | 0.2in | 10.5h | 8.0/10 |
| 🌤️ November | 68°F | 79°F | 25% | 0.1in | 10.0h | 8.2/10 |
| 🌤️ December | 61°F | 72°F | 15% | 0.0in | 8.5h | 7.8/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Halong Bay averages 86°F, 72% rainy days and 10.5h of sunshine per day. Overall weather score: 7.1/10.
See methodology →
Comparison
September vs November (best month)
The best month is November (score 8.2/10). Difference:
- 🌡️ Max temperature : -4°F
- 🌧 Rainy days : -47%
- ☀️ Sunshine : -0.5h/day
FAQ
FAQ — Halong Bay in September
Is September a good time to visit Halong Bay?
September is an acceptable time for Halong Bay (score 7.1/10). Conditions are decent but not optimal — consider November (8.2/10) if possible.
Does it rain a lot in Halong Bay in September?
Yes, 72% of days see rain in September. Plan some indoor activities as backup.
Accommodation
Find a place to stay in Halong Bay
Find places to stay in Halong Bay in September
Search on Hotels.com
Activities & tours
Activities and tours in Halong Bay
Guided tours, skip-the-line tickets and local experiences.
Browse activities on GetYourGuide
Flights
Find a flight to Halong Bay
Compare flights from all airlines.
Search flights
←
Explore also
Similar destinations in September
Macau
Orlando🌍 Top destinations
Other top destinations in September
Oaxaca
Banjul
TrinidadWeather rankings
Compare destinations by weather
Best in EuropeGuides & comparisons