October 21 is generally a great time to visit Hanoi. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 28°C weather. You'll enjoy Hanoi with reasonable crowd levels and competitive accommodation options.
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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 October 21
"Warm & Sunny. Expect average highs of 27.7°C. 19% chance of rain."
What to Wear in Hanoi in October
Based on historical data for October 21, Hanoi typically experiences temperatures between 21.1°C and 27.7°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (19% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Hanoi
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27.7°C
Daytime Peak
Average Low
21.1°C
Nighttime Low
Feels Like
30.8°C
🔥 Feels warmer
Rain Chance
19%
Avg 1.5mm if it rains
Cloud Cover
55%
Overcast
Pressure
1014.5 hPa
Low volatility
Hanoi Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 85% 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
🔴 47 min to burn
Type III-IV
🟡 71 min to burn
Type V-VI
🟢 118 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
23.1°C
Humid/Sticky
Heat Index
30.8°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Vietnam
Flight Traffic
Moderate
54/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~159
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Hanoi
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:55
☀️ Noon
11:42
🌇 Sunset
17:29
⏱️ Daylight
11h 34m
Wind Speed
10.7 km/h
Light breeze
Sunshine
7.8 hrs
Direct Sun (Cloud-free)
Humidity
76%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Hanoi
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Hanoi
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
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 October 21 averages 27.7°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— 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
October 22
27.8°C • 17% rain
Score
99
October 23
27.9°C • 16% rain
Score
99
October 24
27.9°C • 15% rain
Score
99
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (October 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Hanoi Worth Visiting on October 21?
Planning a trip to Hanoi on October 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 27.7°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 159 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 October 21 recorded in the last 30 years saw temperatures hit 30.6°C in 2016, while the coldest dropped to 18.5°C in 2022.