Similan Island 4 Beach Water Temperature & Swim Forecast
Powdery white-sand beach on Ko Miang.
Very warm water with a light chop and a light breeze — great swimming conditions.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Similan Island 4 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.
No wetsuit
At 29.6°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Similan Island 4 Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Similan Island 4 Beach swimming conditions summary
- Water temperature
- 29.6°C
- Water feels
- Bath-warm
- Swimmable today
- Yes — comfortable for most swimmers
- Swim conditions score
- 85/100 · Excellent
- Wetsuit needed
- No wetsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 29.0 °C
- Warmest months to swim
- March, April, May
At 29.6°C the water is warm enough to swim and surf in just a swimsuit or boardshorts. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Similan Island 4 Beach right now?
The sea at Similan Island 4 Beach is currently 29.6°C — excellent swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Similan Island 4 Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Similan Island 4 Beach to sit close to 29.0°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Similan Island 4 Beach?
March – April – May are typically the warmest months to swim at Similan Island 4 Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Similan Island 4 Beach?
With water currently at 29.6°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Similan Island 4 Beach today?
The sea is currently 29.6°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Ko Similan, Thailand (Andaman Sea).
- • 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.
Best time to swim in Similan Island 4 Beach
The sea in Similan Island 4 Beach peaks in April, when the water averages around 30°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 27°C, when cold-water swimmers dominate the coast.
Similan Island 4 Beach sea temperature history
Long-term climatology for Similan Island 4 Beach shows an annual mean sea temperature of 29°C, ranging from 27°C in winter to 30°C at the summer peak.
The seasonal swing is roughly 3°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Similan Island 4 Beach, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Similan Island 4 Beach sea temperature: frequently asked questions
What is the warmest month to swim in Similan Island 4 Beach?
April is the warmest month in Similan Island 4 Beach, when the sea averages about 30°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Similan Island 4 Beach?
The coldest month in Similan Island 4 Beach is typically January, when the water averages around 27°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Similan Island 4 Beach without a wetsuit?
The main swimming season in Similan Island 4 Beach runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Similan Island 4 Beach?
Similan Island 4 Beach stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Similan Island 4 Beach?
The long-term annual mean sea temperature in Similan Island 4 Beach is about 29°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Similan Island 4 Beach?
The live reading at the top of this page shows the current sea temperature in Similan Island 4 Beach, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb – Mar – Apr – May – Jun – Jul – Aug – Sep – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 27°C | Hot |
| Feb | 28°C | Hot |
| Mar | 29°C | Hot |
| Apr ⭐ | 30°C | Hot |
| May | 30°C | Hot |
| Jun | 29°C | Hot |
| Jul | 29°C | Hot |
| Aug | 29°C | Hot |
| Sep | 29°C | Hot |
| Oct | 29°C | Hot |
| Nov | 28°C | Hot |
| Dec | 27°C | Hot |
Nearby beaches
The closest coastline, with live water temperatures.