September 13 sees frequent showers in Halong Bay. Historical data shows a 64% chance of rain, so pack accordingly. Temperatures average 30°C. Expect a bustling atmosphere in Halong Bay right now—this is when the city truly comes alive with visitors.
View the full calendar
Essential Travel Info for Halong Bay
Currency
VND
₫ Vietnamese đồng
Language
Vietnamese
Driving
Right side
Safety
High Safety
GPI: 1.786
Halong Bay Weather Forecast for September 13
"Rainy & Overcast. Expect average highs of 29.7°C. 64% chance of rain."
What to Wear in Halong Bay in September
Based on historical data for September 13, Halong Bay typically experiences temperatures between 25.3°C and 29.7°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 64% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Halong Bay
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
29.7°C
Daytime Peak
Average Low
25.3°C
Nighttime Low
Feels Like
38.1°C
🔥 Heat index effect
Rain Chance
64%
Avg 7.8mm if it rains
Cloud Cover
74%
Moderate rain
Pressure
1007.7 hPa
Low volatility
Halong Bay Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 30 min to burn
Type III-IV
🟡 45 min to burn
Type V-VI
🟢 75 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
26.9°C
Humid/Sticky
Heat Index
38.1°C
Feels hotter
😕 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Vietnam
Flight Traffic
High
88/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~22
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Halong Bay
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:39
☀️ Noon
11:48
🌇 Sunset
17:58
⏱️ Daylight
12h 19m
Wind Speed
12.6 km/h
Gentle breeze
Sunshine
8.2 hrs
Direct Sun (Cloud-free)
Humidity
85%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Halong Bay
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Halong Bay
Travel Comfort Index
Real-time tourism conditions
Weather Quality
🌧️ Variable
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Unhealthy for sensitive groups. Consider wearing a mask outdoors.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
Typhoon Risk
Year-round risk present
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Halong Bay on September 13 averages 29.7°C with a 64% precipitation probability. Wedding/Outdoor Event Score: 64/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Halong Bay Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 20
29.9°C • 54% rain
Score
75
September 19
29.9°C • 58% rain
Score
71
September 18
30°C • 61% rain
Score
69
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 13) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Halong Bay Worth Visiting on September 13?
Planning a trip to Halong Bay on September 13? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 29.7°C with a 64% historical precipitation risk.
✈️ Travel Logistics: Approximately 22 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 10 vaccinations are recommended for Vietnam, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 30.4°C (hot soup). Wave conditions are generally lake-like with heights around 0.35m.
📊 Historical Extremes: The hottest September 13 recorded in the last 30 years saw temperatures hit 31.8°C in 2021, while the coldest dropped to 24.6°C in 2024.