December is a popular month to ask about Rhossili Bay because conditions can shift week to week along this coast. Expect the water near 10.0°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 Irish Sea.
Rhossili Bay sea temperature in December — averages 10.0°C
The sea at Rhossili Bay in United Kingdom averages 10.0°C during December, based on long-run climatology for the Irish Sea. 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
10.0°C
cool · Poor
Live water now
…
Recommended wetsuit
5/4mm fullsuit + boots & gloves
At 10.0°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood.
Monthly comparison
Cold — wetsuit recommended · Rhossili Bay
Can you swim at Rhossili Bay in June? — 14.0°C water14.0°CCan you swim at Rhossili Bay in July? — 16.0°C water16.0°CCan you swim at Rhossili Bay in August? — 17.0°C water17.0°CCan you swim at Rhossili Bay in September? — 16.0°C water16.0°CCan you swim at Rhossili Bay in October? — 14.0°C water14.0°CCan you swim at Rhossili Bay in November? — 12.0°C water12.0°C
Frequently asked questions
What is the average sea temperature at Rhossili Bay in December?
Rhossili Bay averages 10.0°C in December, based on long-run climatology for the Irish Sea.
Is the sea warm enough to swim at Rhossili Bay in December?
Not without thermal protection — a wetsuit is recommended at 10.0°C.
Do I need a wetsuit at Rhossili Bay in December?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.