It depends. Portorož sits around 19.0°C in May; confident swimmers will be fine, casual bathers may prefer short sessions.
Monthly averages set expectations, but the specific beach today depends on wind, swell and recent weather. Check the live value at the top of this page or open the Portorož live page for full conditions.
Best months to swim
June · July · August · September
Frequently asked questions
What is the average sea temperature at Portorož in May?
Portorož averages 19.0°C in May, based on long-run climatology for the Adriatic Sea.
Is the sea warm enough to swim at Portorož in May?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Portorož in May?
A 2 mm shorty is comfortable for sessions over 30 minutes.
