December is a popular month to ask about Sunny Beach because conditions can shift week to week along this coast. Expect the water near 11.0°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 Black Sea.
Sunny Beach sea temperature in December — averages 11.0°C
The sea at Sunny Beach in Bulgaria averages 11.0°C during December, based on long-run climatology for the Black 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
11.0°C
cool · Poor
Live water now
…
Recommended wetsuit
5/4mm fullsuit + boots & gloves
At 11.0°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood.
Monthly comparison
Cold — wetsuit recommended · Sunny Beach
Can you swim at Sunny Beach in June? — 22.0°C water22.0°CCan you swim at Sunny Beach in July? — 25.0°C water25.0°CCan you swim at Sunny Beach in August? — 26.0°C water26.0°CCan you swim at Sunny Beach in September? — 23.0°C water23.0°CCan you swim at Sunny Beach in October? — 18.0°C water18.0°CCan you swim at Sunny Beach in November? — 14.0°C water14.0°C
Frequently asked questions
What is the average sea temperature at Sunny Beach in December?
Sunny Beach averages 11.0°C in December, based on long-run climatology for the Black Sea.
Is the sea warm enough to swim at Sunny Beach in December?
Not without thermal protection — a wetsuit is recommended at 11.0°C.
Do I need a wetsuit at Sunny Beach in December?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.