April 21 is generally a great time to visit Vientiane. While there is a slight chance of rain (17%), showers are usually brief. Expect comfortable 35°C weather. You'll enjoy Vientiane with reasonable crowd levels and competitive accommodation options.
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Essential Travel Info for Vientiane
Currency
LAK
₭ Lao kip
Language
Lao
Driving
Right side
Connect
Most hotels, restaurants, cafes, bars et...
Safety
High Safety
GPI: 1.809
Vientiane Weather Forecast for April 21
"Warm & Sunny. Expect average highs of 34.6°C. 17% chance of rain."
What to Wear in Vientiane in April
Based on historical data for April 21, Vientiane typically experiences temperatures between 25.1°C and 34.6°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (17% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Vientiane
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
34.6°C
Daytime Peak
Average Low
25.1°C
Nighttime Low
Feels Like
46.8°C
🔥 Heat index effect
Rain Chance
17%
Avg 1.1mm if it rains
Cloud Cover
46%
Light drizzle
Pressure
1007.5 hPa
Low volatility
Vientiane 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
🔴 14 min to burn
Type III-IV
🟡 21 min to burn
Type V-VI
🟢 35 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
46.8°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 Laos
Flight Traffic
Moderate
59/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~32
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Vientiane
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:50
☀️ Noon
12:09
🌇 Sunset
18:28
⏱️ Daylight
12h 38m
Wind Speed
9.8 km/h
Light breeze
Sunshine
11.0 hrs
Direct Sun (Cloud-free)
Humidity
66%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Vientiane
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Vientiane
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.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Vientiane on April 21 averages 34.6°C with a 17% precipitation probability. Wedding/Outdoor Event Score: 89/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Vientiane Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 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 Vientiane Worth Visiting on April 21?
Planning a trip to Vientiane 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 34.6°C with a 17% historical precipitation risk.
✈️ Travel Logistics: Approximately 32 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 10 vaccinations are recommended for Laos, including COVID-19.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 38.5°C in 2023, while the coldest dropped to 23°C in 2022.