May is a popular month to ask about Mamaia because conditions can shift week to week along this coast. Expect the water near 15.0°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.
Mamaia sea temperature in May — averages 15.0°C
The sea at Mamaia in Romania averages 15.0°C during May, 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 · May
15.0°C
mild · Fair
Live water now
…
Recommended wetsuit
4/3mm fullsuit
At 15.0°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
Monthly comparison
Cool — short dips or a shorty wetsuit · Mamaia
Can you swim at Mamaia in June? — 21.0°C water21.0°CCan you swim at Mamaia in July? — 24.0°C water24.0°CCan you swim at Mamaia in August? — 25.0°C water25.0°CCan you swim at Mamaia in September? — 22.0°C water22.0°CCan you swim at Mamaia in October? — 17.0°C water17.0°CCan you swim at Mamaia in November? — 12.0°C water12.0°C
Frequently asked questions
What is the average sea temperature at Mamaia in May?
Mamaia averages 15.0°C in May, based on long-run climatology for the Black Sea.
Is the sea warm enough to swim at Mamaia in May?
Not without thermal protection — a wetsuit is recommended at 15.0°C.
Do I need a wetsuit at Mamaia in May?
A 3/2 mm wetsuit makes longer swims comfortable.