Beach Weather
Comprehensive weather and environmental data for Koh Samui
22°-33°CAnnual Temperature
1950mmAnnual Rainfall
27°-30°CSea Temperature
52kmCoastline
AprilNow
April Weather
Shoulder SeasonVery Good Weather
Temperature25° - 32°CFeels like 33° - 35°C
Humidity80%very high
Rainfall85mm6 rainy days
Sunshine8 hrs/dayFrequent afternoon clouds
Wind11-15 km/hSouthwest (early)
Waves0.8-1.2mGentle Breeze
Sea Temperature30°CExcellent (warmest)
Water Visibility25-35mexcellent
Best For This Month
Rainfall Pattern:Pre-monsoon; brief afternoon downpours
UV Index
11Extreme
Peak Hours: 9 AM - 3 PM
Burn Time: 12-15 minutes
SPF 50+ sunscreen mandatory. Reapply every 2 hours.
Air Quality
95Moderate
PM2.5: 32-38 µg/m³
PM10: 45-55 µg/m³
Acceptable for most
Peak haze season from regional biomass burning
Data based on 3-year averages (2023-2026). Actual conditions may vary. Always observe local flag warnings on the beach.