April 21 is generally a great time to visit Hanoi. While there is a slight chance of rain (28%), showers are usually brief. Expect comfortable 31°C weather. As it's peak season for Hanoi, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Hanoi
Currency
VND
₫ Vietnamese đồng
Language
Vietnamese
Driving
Right side
Connect
Most regular restaurants and cafés have ...
Safety
High Safety
GPI: 1.786
Hanoi Weather Forecast for April 21
"Warm & Sunny. Expect average highs of 30.7°C. 28% chance of rain."
What to Wear in Hanoi in April
Based on historical data for April 21, Hanoi typically experiences temperatures between 23.2°C and 30.7°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 28% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Hanoi
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
30.7°C
Daytime Peak
Average Low
23.2°C
Nighttime Low
Feels Like
40.6°C
🔥 Heat index effect
Rain Chance
28%
Avg 2.4mm if it rains
Cloud Cover
67%
Light drizzle
Pressure
1007.5 hPa
Medium volatility
Hanoi Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 97% 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
🔴 18 min to burn
Type III-IV
🟡 27 min to burn
Type V-VI
🟢 45 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
27.3°C
Humid/Sticky
Heat Index
40.6°C
Feels hotter
😕 Best outdoor time:
Early morning (6-9 AM) or evening (after 6 PM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Vietnam
Flight Traffic
High
92/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~271
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Hanoi
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:34
☀️ Noon
11:56
🌇 Sunset
18:18
⏱️ Daylight
12h 43m
Wind Speed
15.4 km/h
Gentle breeze
Sunshine
7.8 hrs
Direct Sun (Cloud-free)
Humidity
82%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Hanoi
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 Hanoi
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
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. Everyone should reduce outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Hanoi on April 21 averages 30.7°C with a 28% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Hanoi Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
April 14
28.2°C • 27% rain
Score
91
April 16
29°C • 21% rain
Score
91
April 17
29.6°C • 19% rain
Score
91
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (April 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Hanoi Worth Visiting on April 21?
Planning a trip to Hanoi on April 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 30.7°C with a 28% historical precipitation risk.
✈️ Travel Logistics: Approximately 271 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 10 vaccinations are recommended for Vietnam, including COVID-19.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 34.7°C in 2019, while the coldest dropped to 17.4°C in 2022.