Emerald Beach Okinawa — Sea temperature now
Man-made triple-cove beach at Ocean Expo Park.
Very warm water with a light chop and a light breeze — great swimming conditions.
Location
Emerald Beach Okinawa on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Emerald Beach Okinawa
The sea in Emerald Beach Okinawa peaks in July, when the water averages around 28°C.
The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.
On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
The coldest month is typically January at around 18°C, when cold-water swimmers dominate the coast.
Emerald Beach Okinawa sea temperature history
Long-term climatology for Emerald Beach Okinawa shows an annual mean sea temperature of 23°C, ranging from 18°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 10°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 Emerald Beach Okinawa, 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.
Emerald Beach Okinawa sea temperature: frequently asked questions
What is the warmest month to swim in Emerald Beach Okinawa?
July is the warmest month in Emerald Beach Okinawa, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Emerald Beach Okinawa?
The coldest month in Emerald Beach Okinawa is typically January, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Emerald Beach Okinawa without a wetsuit?
The main swimming season in Emerald Beach Okinawa runs from April – November — about 8 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 Emerald Beach Okinawa?
Outside peak summer the water in Emerald Beach Okinawa drops toward 19°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Emerald Beach Okinawa?
The long-term annual mean sea temperature in Emerald Beach Okinawa is about 23°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Emerald Beach Okinawa?
The live reading at the top of this page shows the current sea temperature in Emerald Beach Okinawa, 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: Apr – May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 18°C | Pleasant |
| Feb | 18°C | Pleasant |
| Mar | 19°C | Pleasant |
| Apr | 21°C | Pleasant |
| May | 23°C | Warm |
| Jun | 26°C | Hot |
| Jul ⭐ | 28°C | Hot |
| Aug | 28°C | Hot |
| Sep | 27°C | Hot |
| Oct | 24°C | Warm |
| Nov | 21°C | Pleasant |
| Dec | 19°C | Pleasant |