December is a popular month to ask about Onjuku Beach because conditions can shift week to week along this coast. Expect the water near 14,0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Pacific Ocean.
Onjuku Beach sea temperature in December — averages 14,0°C
The sea at Onjuku Beach in Japan averages 14,0°C during December, based on long-run climatology for the Pacific Ocean. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · December
14,0°C
cool · Fair
Live water now
…
Recommended wetsuit
4/3mm fullsuit
At 14.0°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
Monthly comparison
Cool — short dips or a shorty wetsuit · Onjuku Beach
Can you swim at Onjuku Beach in July? — 24,0°C water24,0°CCan you swim at Onjuku Beach in August? — 24,0°C water24,0°CCan you swim at Onjuku Beach in September? — 22,0°C water22,0°CCan you swim at Onjuku Beach in October? — 19,0°C water19,0°CCan you swim at Onjuku Beach in November? — 16,0°C water16,0°CCan you swim at Onjuku Beach in December? — 14,0°C water14,0°C
Frequently asked questions
What is the average sea temperature at Onjuku Beach in December?
Onjuku Beach averages 14,0°C in December, based on long-run climatology for the Pacific Ocean.
Is the sea warm enough to swim at Onjuku Beach in December?
Not without thermal protection — a wetsuit is recommended at 14,0°C.
Do I need a wetsuit at Onjuku Beach in December?
A 3/2 mm wetsuit makes longer swims comfortable.