February 21 is generally a great time to visit Koh Samui. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 26°C weather. Koh Samui is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Koh Samui
Currency
THB
฿ Thai baht
Language
Thai
Driving
Left side
Safety
Moderate Safety
GPI: 2.098
Koh Samui Weather Forecast for February 21
"Warm & Sunny. Expect average highs of 25.9°C. 23% chance of rain."
What to Wear in Koh Samui in February
Based on historical data for February 21, Koh Samui typically experiences temperatures between 22.9°C and 25.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (23% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Koh Samui
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
25.9°C
Daytime Peak
Average Low
22.9°C
Nighttime Low
Feels Like
26.9°C
☀️ Minor difference
Rain Chance
23%
Avg 0.7mm if it rains
Cloud Cover
45%
Overcast
Pressure
N/A
Low volatility
Koh Samui Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% 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
🔴 38 min to burn
Type III-IV
🟡 57 min to burn
Type V-VI
🟢 95 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
21.5°C
Humid/Sticky
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Thailand
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~53
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Koh Samui
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:38
☀️ Noon
12:35
🌇 Sunset
18:31
⏱️ Daylight
11h 52m
Wind Speed
19.8 km/h
Gentle breeze
Sunshine
10.8 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Koh Samui
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Koh Samui
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟢 Quiet
Price Level
💰 Affordable
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.
Typhoon Risk
Year-round risk present
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Koh Samui on February 21 averages 25.9°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 95/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Koh Samui Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
February 14
25.9°C • 13% rain
Score
100
February 15
25.9°C • 13% rain
Score
100
February 16
25.9°C • 13% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (February 21) in other destinations
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📍 Is Koh Samui Worth Visiting on February 21?
Planning a trip to Koh Samui on February 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 25.9°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 53 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 11 vaccinations are recommended for Thailand, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 29.2°C (hot soup). Wave conditions are generally fun waves with heights around 0.5m.
📊 Historical Extremes: The hottest February 21 recorded in the last 30 years saw temperatures hit 28.9°C in 2024, while the coldest dropped to 20.8°C in 2023.