It depends. Sanya Bay sits around 18.0°C in May; confident swimmers will be fine, casual bathers may prefer short sessions.
Monthly averages set expectations, but the specific beach today depends on wind, swell and recent weather. Check the live value at the top of this page or open the Sanya Bay live page for full conditions.
Best months to swim
June · July · August · September
Frequently asked questions
What is the average sea temperature at Sanya Bay in May?
Sanya Bay averages 18.0°C in May, based on long-run climatology for the South China Sea.
Is the sea warm enough to swim at Sanya Bay in May?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Sanya Bay in May?
A 2 mm shorty is comfortable for sessions over 30 minutes.
