Location
Sunayama 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 28.2°C the water is warm enough to swim and surf in just a swimsuit or boardshorts.
Recommendation tuned for Sunayama Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Can I swim at Sunayama Beach today?
The sea is currently 28.2°C — excellent swimming conditions. Most swimmers will find it pleasant.
- • Located in Okinawa, Japan (East 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 Sunayama Beach
The sea in Sunayama Beach peaks in June, when the water averages around 28°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 24°C, when cold-water swimmers dominate the coast.
Sunayama Beach sea temperature history
Long-term climatology for Sunayama Beach shows an annual mean sea temperature of 26°C, ranging from 24°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 4°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 Sunayama 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.
Sunayama Beach sea temperature: frequently asked questions
What is the warmest month to swim in Sunayama Beach?
June is the warmest month in Sunayama Beach, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Sunayama Beach?
The coldest month in Sunayama Beach is typically January, when the water averages around 24°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Sunayama Beach without a wetsuit?
The main swimming season in Sunayama 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 Sunayama Beach?
Sunayama 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 Sunayama Beach?
The long-term annual mean sea temperature in Sunayama Beach is about 26°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Sunayama Beach?
The live reading at the top of this page shows the current sea temperature in Sunayama 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 | 24°C | Warm |
| Feb | 24°C | Warm |
| Mar | 25°C | Warm |
| Apr | 26°C | Hot |
| May | 27°C | Hot |
| Jun ⭐ | 28°C | Hot |
| Jul | 28°C | Hot |
| Aug | 28°C | Hot |
| Sep | 28°C | Hot |
| Oct | 27°C | Hot |
| Nov | 26°C | Hot |
| Dec | 25°C | Warm |
Nearby beaches
The closest coastline, with live water temperatures.