April 4 is statistically one of the best days of the year in Halong Bay. With minimal rain risk (10%) and pleasant highs of 25°C, it's ideal for outdoor adventures. As it's peak season for Halong Bay, we recommend booking your stay well in advance to secure the best rates.
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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 April 4
"Warm & Sunny. Expect average highs of 25.3°C. 10% chance of rain."
What to Wear in Halong Bay in April
Based on historical data for April 4, Halong Bay typically experiences temperatures between 20.5°C and 25.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (10% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Halong Bay
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
25.3°C
Daytime Peak
Average Low
20.5°C
Nighttime Low
Feels Like
26.4°C
☀️ Minor difference
Rain Chance
10%
Avg 0.7mm if it rains
Cloud Cover
71%
Overcast
Pressure
1012.2 hPa
Medium 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 88% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 19 min to burn
Type III-IV
🟡 29 min to burn
Type V-VI
🟢 48 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
22.2°C
Humid/Sticky
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Vietnam
Flight Traffic
High
84/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~21
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Halong Bay
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:43
☀️ Noon
11:55
🌇 Sunset
18:07
⏱️ Daylight
12h 24m
Wind Speed
14.9 km/h
Gentle breeze
Sunshine
7.5 hrs
Direct Sun (Cloud-free)
Humidity
83%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Halong Bay
Smart Flight Estimator
Airport-to-Airport Logistics
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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
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
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 April 4 averages 25.3°C with a 10% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— 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
Compare Other Cities
Same date (April 4) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Halong Bay Worth Visiting on April 4?
Planning a trip to Halong Bay on April 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 25.3°C with a 10% historical precipitation risk.
✈️ Travel Logistics: Approximately 21 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 24°C (swimming pool). Wave conditions are generally fun waves with heights around 0.52m.
📊 Historical Extremes: The hottest April 4 recorded in the last 30 years saw temperatures hit 27.7°C in 2023, while the coldest dropped to 16.6°C in 2022.