Swimming in Slovenia in may 2025 Sea temperature by city in may
Do you want to go to the beach in Slovenia in may 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in may in Slovenia by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Slovenia in may 2025
Here, find the average sea temperature in Slovenia in may in several coastal cities.
65°F
min: 57°F / max: 72°F
Ankaran
65°F
min: 58°F / max: 72°F
65°F
min: 57°F / max: 72°F
Koper
65°F
min: 58°F / max: 72°F
Portorož
65°F
min: 58°F / max: 72°F
Where should you go swimming in Slovenia in the month of may?
Swimming in Slovenia in may is cool
In may in Slovenia swimming conditions are generally the same everywhere.
Swimming in may in Piran, Ankaran, Izola, Koper and Portorož is possible but the sea is generally cool. So though the sea temperature may sometimes reach 72°F, it can also go as low as 57°F. Note that the average is 65°F.
Where to go swimming in Slovenia in may: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in may
Piran
| May | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 57°F | ||
| Maximum sea temperature | 72°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 9.3in | ||
| Number of days of precipitation | 13 jour(s) (41%) | ||
| Cloud cover | 36% | ||
| Our opinion | cool swimming |
More information on swimming in Piran in may
Ankaran
| May | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 72°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 9.3in | ||
| Number of days of precipitation | 13 jour(s) (41%) | ||
| Cloud cover | 36% | ||
| Our opinion | cool swimming |
Izola
| May | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 57°F | ||
| Maximum sea temperature | 72°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 9.3in | ||
| Number of days of precipitation | 13 jour(s) (41%) | ||
| Cloud cover | 36% | ||
| Our opinion | cool swimming |
More information on swimming in Izola in may
Koper
| May | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 72°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 9.3in | ||
| Number of days of precipitation | 13 jour(s) (41%) | ||
| Cloud cover | 36% | ||
| Our opinion | cool swimming |
Portorož
| May | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 72°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 9.3in | ||
| Number of days of precipitation | 13 jour(s) (41%) | ||
| Cloud cover | 36% | ||
| Our opinion | cool swimming |
List of coastal cities in Slovenia
| Piran in may | cool swimming |
| Ankaran in may | cool swimming |
| Izola in may | cool swimming |
| Koper in may | cool swimming |
| Portorož in may | cool swimming |