January is a popular month to ask about Strunjan because conditions can shift week to week along this coast. Expect the water near 13.0°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 Adriatic Sea.
Strunjan sea temperature in January — averages 13.0°C
The sea at Strunjan in Slovenia averages 13.0°C during January, based on long-run climatology for the Adriatic 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 · January
13.0°C
cool · Fair
Live water now
…
Recommended wetsuit
4/3mm fullsuit
At 13.0°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
Monthly comparison
Cool — short dips or a shorty wetsuit · Strunjan
Can you swim at Strunjan in June? — 23.0°C water23.0°CCan you swim at Strunjan in July? — 25.0°C water25.0°CCan you swim at Strunjan in August? — 26.0°C water26.0°CCan you swim at Strunjan in September? — 23.0°C water23.0°CCan you swim at Strunjan in October? — 20.0°C water20.0°CCan you swim at Strunjan in November? — 17.0°C water17.0°C
Frequently asked questions
What is the average sea temperature at Strunjan in January?
Strunjan averages 13.0°C in January, based on long-run climatology for the Adriatic Sea.
Is the sea warm enough to swim at Strunjan in January?
Not without thermal protection — a wetsuit is recommended at 13.0°C.
Do I need a wetsuit at Strunjan in January?
A 3/2 mm wetsuit makes longer swims comfortable.