Historical data suggests significant rain risk (70%) on October 4. If you seek sun, consider a different date. Bring rain gear! Koh Samui is seeing high visitor numbers, so iconic spots may be busier than usual.
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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 October 4
"Rainy & Overcast. Expect average highs of 26.2°C. 70% chance of rain."
What to Wear in Koh Samui in October
Based on historical data for October 4, Koh Samui typically experiences temperatures between 22.8°C and 26.2°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 70% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Koh Samui
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
26.2°C
Daytime Peak
Average Low
22.8°C
Nighttime Low
Feels Like
27.4°C
☀️ Minor difference
Rain Chance
70%
Avg 7.2mm if it rains
Cloud Cover
89%
Slight rain
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 88% 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
🔴 67 min to burn
Type III-IV
🟡 101 min to burn
Type V-VI
🟢 168 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
22.9°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
Busy
75/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~40
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Koh Samui
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:09
☀️ Noon
12:10
🌇 Sunset
18:10
⏱️ Daylight
12h 1m
Wind Speed
17.6 km/h
Gentle breeze
Sunshine
8.3 hrs
Direct Sun (Cloud-free)
Humidity
82%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Koh Samui
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Koh Samui
Travel Comfort Index
Real-time tourism conditions
Weather Quality
🌧️ Variable
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.
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 October 4 averages 26.2°C with a 70% precipitation probability. Wedding/Outdoor Event Score: 60/100."
— 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
September 28
26.4°C • 61% rain
Score
67
October 11
26°C • 62% rain
Score
67
September 27
26.4°C • 62% rain
Score
66
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (October 4) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Koh Samui Worth Visiting on October 4?
Planning a trip to Koh Samui on October 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 26.2°C with a 70% historical precipitation risk.
✈️ Travel Logistics: Approximately 40 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 30.4°C (hot soup). Wave conditions are generally lake-like with heights around 0.26m.
📊 Historical Extremes: The hottest October 4 recorded in the last 30 years saw temperatures hit 29.4°C in 2025, while the coldest dropped to 21.9°C in 2022.