April 21 is generally a great time to visit Bangkok. While there is a slight chance of rain (17%), showers are usually brief. Expect comfortable 35°C weather. Expect a bustling atmosphere in Bangkok right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for Bangkok
Currency
THB
฿ Thai baht
Language
Thai
Driving
Left side
Connect
Prepaid SIM cards for tourists are readi...
Safety
Moderate Safety
GPI: 2.098
Bangkok Weather Forecast for April 21
"Warm & Sunny. Expect average highs of 35.4°C. 17% chance of rain."
What to Wear in Bangkok in April
Based on historical data for April 21, Bangkok typically experiences temperatures between 27.3°C and 35.4°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 Bangkok
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
35.4°C
Daytime Peak
Average Low
27.3°C
Nighttime Low
Feels Like
51.2°C
🔥 Heat index effect
Rain Chance
17%
Avg 1mm if it rains
Cloud Cover
50%
Light drizzle
Pressure
1007.8 hPa
Low volatility
Bangkok Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 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
28.8°C
Humid/Sticky
Heat Index
51.2°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 Thailand
Flight Traffic
High
89/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~496
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Bangkok
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:02
☀️ Noon
12:17
🌇 Sunset
18:33
⏱️ Daylight
12h 30m
Wind Speed
16.2 km/h
Gentle breeze
Sunshine
11.3 hrs
Direct Sun (Cloud-free)
Humidity
69%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Bangkok
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Bangkok
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 for sensitive groups. Consider wearing a mask outdoors.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Bangkok on April 21 averages 35.4°C with a 17% precipitation probability. Wedding/Outdoor Event Score: 85/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Bangkok 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 Bangkok Worth Visiting on April 21?
Planning a trip to Bangkok 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 35.4°C with a 17% historical precipitation risk.
✈️ Travel Logistics: Approximately 496 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 11 vaccinations are recommended for Thailand, including COVID-19.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 39°C in 2024, while the coldest dropped to 25.7°C in 2022.