Thailand
Surat Thani · Gulf of Thailand
Lamai Beach
Coastal beach in Koh Samui.
Very warm water with calm seas and a moderate breeze — great swimming conditions.
Sea temperature now
31.3°Ctropical
Excellent
Updated just now · Source: Open-Meteo Marine
Air temperature
26.8°C
Wave height
0.3 m
Wind
16.9 km/h
UV index
2.1 UV index
Location
Lamai Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Wetsuit recommendation
No wetsuit
At 31.3°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Surf & watersports
Tropical-feel conditions. Most swimmers stay comfortable for an hour or more without thermal protection. UV exposure is the bigger risk — sunscreen and a rash vest are worth packing.
Open-water swimming
Open-water swims of 60+ minutes feel comfortable with no neoprene.
Recommendation tuned for Lamai Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Quick answer
Can I swim at Lamai Beach today?
The sea is currently 31.3°C — excellent swimming conditions. Most swimmers will find it pleasant.
Key takeaways
- • Located in Surat Thani, Thailand (Gulf of Thailand).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Jan15°CFeb14°CMar15°CApr16°CMay18°CJun22°CBestJul25°CBestAug26°CBestSep24°CBestOct21°CNov18°CDec16°C
14°C → 26°C· Current month outlined· “Best” = within 2°C of the annual peak
Year-round sea temperature
Best swim months: Jun – Jul – Aug – Sep – Oct
| Month | Sea | Comfort |
|---|---|---|
| Jan | 15°C | Bracing |
| Feb | 14°C | Bracing |
| Mar | 15°C | Bracing |
| Apr | 16°C | Bracing |
| May | 18°C | Pleasant |
| Jun | 22°C | Warm |
| Jul | 25°C | Warm |
| Aug ⭐ | 26°C | Hot |
| Sep | 24°C | Warm |
| Oct | 21°C | Pleasant |
| Nov | 18°C | Pleasant |
| Dec | 16°C | Bracing |
Can you swim here? — Lamai Beach
Same region this month — Surat Thani
Nearby beaches
The closest coastline, with live water temperatures.