Similan Islands Sea Temperature
Updated Sat 09:30 (Asia/Bangkok)
Thailand · Forecast updated Aug 8, 2026, 09:30 UTC
Current Sea Temperature
29.2°C
84.6°F
Very warm water
Versus this month's average
Close to average
The August average in our archive is 29.3°C (84.7°F).
Recent trend
Holding fairly steady
Seven-day average: 29.3°C, versus 29.5°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Similan Islands, monthly averages range from about 29.3°C (84.7°F) in August to 29.6°C (85.2°F) in June.
Over the past 30 days, the average sea temperature in Similan Islands has been 29.4°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 29.0°C / 84.2°F | 29.6°C / 85.2°F | 30.4°C / 86.7°F |
| July | 29.1°C / 84.4°F | 29.5°C / 85.0°F | 29.9°C / 85.8°F |
| August | 29.1°C / 84.4°F | 29.3°C / 84.7°F | 29.7°C / 85.5°F |
Profile calculated from 1650 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Similan Islands
Andaman archipelago marine park with granite boulders and crystal-clear reefs.
- Area
- Phang Nga
Similan Islands Water Temperature: Common Questions
What is the sea temperature in Similan Islands today?
The current sea surface temperature in Similan Islands is 29.2°C. Over the last 30 days, the average has been 29.4°C.
When is the water warmest in Similan Islands?
The warmest monthly average in the Similan Islands archive is June, at around 29.6°C (85.2°F).
When is the water coldest in Similan Islands?
The coldest monthly average in the archive is August, at around 29.3°C (84.7°F).
Can you swim in Similan Islands today?
At 29.2°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Similan Islands.
View Snorkel Forecast →