Sanya Bay Water Temperature & Swim Forecast
Long palm-backed Hainan city beach.
Live conditions loading.
Location
Sanya Bay on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Sanya Bay's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Sanya Bay swimming conditions summary
- Water temperature
- —
- Water feels
- —
- Swimmable today
- Loading live reading
- Swim conditions score
- —
- Wetsuit needed
- Check live temperature
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Warmest months to swim
- May, June, July
Live water temperature is loading — refresh in a moment for a precise recommendation. Live marine data updated hourly from Open-Meteo Marine.
Frequently asked questions
Can I swim at Sanya Bay right now?
Live data is loading. Use the 7-day forecast above to plan your swim — conditions above 22°C are comfortable for most swimmers.
What will the sea temperature be at Sanya Bay next week?
Based on long-term August averages and the latest marine model, expect the sea around Sanya Bay to sit close to 28.0°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 Sanya Bay?
May – June – July are typically the warmest months to swim at Sanya Bay, with sea temperatures at their seasonal peak.
Can I swim at Sanya Bay today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Hainan, China (South China 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 Sanya Bay
The sea in Sanya Bay peaks in May, when the water averages around 29°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 26°C, when cold-water swimmers dominate the coast.
Sanya Bay sea temperature history
Long-term climatology for Sanya Bay shows an annual mean sea temperature of 28°C, ranging from 26°C in winter to 29°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 Sanya Bay, 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.
Sanya Bay sea temperature: frequently asked questions
What is the warmest month to swim in Sanya Bay?
May is the warmest month in Sanya Bay, when the sea averages about 29°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Sanya Bay?
The coldest month in Sanya Bay is typically January, when the water averages around 26°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Sanya Bay without a wetsuit?
The main swimming season in Sanya Bay 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 Sanya Bay?
Sanya Bay 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 Sanya Bay?
The long-term annual mean sea temperature in Sanya Bay is about 28°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Sanya Bay?
The live reading at the top of this page shows the current sea temperature in Sanya Bay, 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 | 26°C | Hot |
| Feb | 26°C | Hot |
| Mar | 27°C | Hot |
| Apr | 28°C | Hot |
| May ⭐ | 29°C | Hot |
| Jun | 29°C | Hot |
| Jul | 29°C | Hot |
| Aug | 28°C | Hot |
| Sep | 28°C | Hot |
| Oct | 28°C | Hot |
| Nov | 27°C | Hot |
| Dec | 26°C | Hot |
Nearby beaches
The closest coastline, with live water temperatures.