December 21 is statistically one of the best days of the year in Bangkok. With minimal rain risk (0%) and pleasant highs of 31°C, it's ideal for outdoor adventures. 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 December 21
"Warm & Sunny. Expect average highs of 30.5°C. 0% chance of rain."
What to Wear in Bangkok in December
Based on historical data for December 21, Bangkok typically experiences temperatures between 21.2°C and 30.5°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (0% 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
30.5°C
Daytime Peak
Average Low
21.2°C
Nighttime Low
Feels Like
33.6°C
🔥 Feels warmer
Rain Chance
0%
Avg 0mm if it rains
Cloud Cover
47%
Overcast
Pressure
1012.7 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 97% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
21.6°C
Humid/Sticky
Heat Index
33.6°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 Thailand
Flight Traffic
High
94/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~524
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Bangkok
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:37
☀️ Noon
12:17
🌇 Sunset
17:56
⏱️ Daylight
11h 18m
Wind Speed
12.7 km/h
Gentle breeze
Sunshine
10.2 hrs
Direct Sun (Cloud-free)
Humidity
59%
Comfortable
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
💰💰💰 Expensive
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 December 21 averages 30.5°C with a 0% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— 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
Compare Other Cities
Same date (December 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Bangkok Worth Visiting on December 21?
Planning a trip to Bangkok on December 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 30.5°C with a 0% historical precipitation risk.
✈️ Travel Logistics: Approximately 524 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 December 21 recorded in the last 30 years saw temperatures hit 33°C in 2019, while the coldest dropped to 15.8°C in 2017.