June 17 is generally a great time to visit Koh Samui. While there is a slight chance of rain (36%), showers are usually brief. Expect comfortable 28°C weather. You'll find plenty of company in Koh Samui this month as tourism activity remains quite robust.
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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 June 17
"Warm & Sunny. Expect average highs of 28°C. 36% chance of rain."
What to Wear in Koh Samui in June
Based on historical data for June 17, Koh Samui typically experiences temperatures between 24.2°C and 28°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 36% 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
28°C
Daytime Peak
Average Low
24.2°C
Nighttime Low
Feels Like
31.5°C
🔥 Feels warmer
Rain Chance
36%
Avg 2.8mm if it rains
Cloud Cover
90%
Light drizzle
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 89% 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
🔴 17 min to burn
Type III-IV
🟡 26 min to burn
Type V-VI
🟢 43 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
23.4°C
Humid/Sticky
Heat Index
31.5°C
Feels hotter
😐 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
70/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~37
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Koh Samui
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:01
☀️ Noon
12:22
🌇 Sunset
18:42
⏱️ Daylight
12h 40m
Wind Speed
22.7 km/h
Moderate wind
Sunshine
9.5 hrs
Direct Sun (Cloud-free)
Humidity
76%
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
⛅ Good
Tourist Crowds
🔴 Very 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.
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 June 17 averages 28°C with a 36% precipitation probability. Wedding/Outdoor Event Score: 84/100."
— 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
June 15
28.2°C • 32% rain
Score
88
June 13
28°C • 31% rain
Score
87
June 14
28.1°C • 31% rain
Score
87
💡 Moving your event by a few days could significantly improve weather conditions
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📍 Is Koh Samui Worth Visiting on June 17?
Planning a trip to Koh Samui on June 17? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28°C with a 36% historical precipitation risk.
✈️ Travel Logistics: Approximately 37 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 31°C (hot soup). Wave conditions are generally lake-like with heights around 0.24m.
📊 Historical Extremes: The hottest June 17 recorded in the last 30 years saw temperatures hit 31.1°C in 2025, while the coldest dropped to 22.6°C in 2018.