The Slovenia resorts with the warmest sea water temperature at this moment are Dolenjske Toplice, Bohinjsko Jezero and Cerkno.
Below you can see a list of all popular Slovenia resorts and information about current sea water temperature and averages for current and next months.
| Resort Name | Current Sea Water Temperature |
March 2025 | April 2025 |
|---|---|---|---|
| Dolenjske Toplice | 54.2°F | 52.7°F | 57.3°F |
| Bohinjsko Jezero | 53.8°F | 50.7°F | 56.8°F |
| Cerkno | 53.8°F | 50.9°F | 56.7°F |
| Portoroz | 53.6°F | 51.9°F | 57.2°F |
| Piran | 53.6°F | 51.9°F | 57.2°F |
| Isola | 53.4°F | 51.6°F | 56.8°F |
| Strunjan | 53.4°F | 51.7°F | 57.0°F |
| Koper | 53.4°F | 51.6°F | 56.8°F |
Please see following sea water temperature averages charts for the warmest Slovenia resorts for more details.
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
Sea Water
Temperature
Temperature
| Dolenjske Toplice |
Sea Water
Temperature
Temperature
| Bohinjsko Jezero |
Sea Water
Temperature
Temperature
| Cerkno |
Slovenia Resorts:
NAME
F°
| Bled |  |
+36 |
| Bohinjsko Jezero | |
+36 |
| Bovec |  |
+38 |
| Cerkno | |
+36 |
| Dolenjske Toplice | |
+42 |
| Isola | |
+46 |
| Koper | |
+46 |
| Kranjska Gora | |
+36 |
| Ljubljana |  |
+40 |
| Maribor | |
+42 |
| Piran | |
+46 |
| Portoroz | |
+46 |
| Rogaska Slatina | |
+40 |
| Rogla | |
+36 |
| Strunjan | |
+46 |
