Yonaha Maehama Beach — Sea temperature now
Seven-km turquoise beach often ranked best in East Asia.
Pleasant water with a light chop and a light breeze — great swimming conditions.
Location
Yonaha Maehama 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.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Yonaha Maehama Beach
The sea in Yonaha Maehama Beach peaks in July, when the water averages around 23°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 20°C, when cold-water swimmers dominate the coast.
Yonaha Maehama Beach sea temperature history
Long-term climatology for Yonaha Maehama Beach shows an annual mean sea temperature of 21°C, ranging from 20°C in winter to 23°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 Yonaha Maehama 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.
Yonaha Maehama Beach sea temperature: frequently asked questions
What is the warmest month to swim in Yonaha Maehama Beach?
July is the warmest month in Yonaha Maehama Beach, when the sea averages about 23°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Yonaha Maehama Beach?
The coldest month in Yonaha Maehama Beach is typically January, when the water averages around 20°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Yonaha Maehama Beach without a wetsuit?
The main swimming season in Yonaha Maehama 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 Yonaha Maehama Beach?
Outside peak summer the water in Yonaha Maehama Beach drops toward 20°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 Yonaha Maehama Beach?
The long-term annual mean sea temperature in Yonaha Maehama Beach is about 21°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Yonaha Maehama Beach?
The live reading at the top of this page shows the current sea temperature in Yonaha Maehama 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 | 20°C | Pleasant |
| Feb | 20°C | Pleasant |
| Mar | 20°C | Pleasant |
| Apr | 20°C | Pleasant |
| May | 21°C | Pleasant |
| Jun | 22°C | Warm |
| Jul ⭐ | 23°C | Warm |
| Aug | 23°C | Warm |
| Sep | 23°C | Warm |
| Oct | 22°C | Warm |
| Nov | 21°C | Pleasant |
| Dec | 20°C | Pleasant |