The Slovenia resorts with the warmest sea water temperature in April are Dolenjske Toplice, Portoroz and Piran.
Below you can see a list of all popular Slovenia resorts and information about sea water temperature in April for the last two years.
| Resort Name | April 2025 | April 2024 | April 2023 |
|---|---|---|---|
| Dolenjske Toplice | 57.3°F | 59.4°F | 55.0°F |
| Portoroz | 57.2°F | 59.7°F | 55.0°F |
| Piran | 57.2°F | 59.7°F | 55.0°F |
| Strunjan | 57.0°F | 59.4°F | 54.7°F |
| Bohinjsko Jezero | 56.8°F | 57.9°F | 54.8°F |
| Isola | 56.8°F | 59.1°F | 54.5°F |
| Koper | 56.8°F | 58.8°F | 54.4°F |
| Cerkno | 56.7°F | 57.9°F | 54.7°F |
Please see following sea water temperature averages charts for the warmest Slovenia resorts in April.
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.
Slovenia Resorts:
NAME
F°
| Bled |  |
+52 |
| Bohinjsko Jezero | |
+52 |
| Cerkno |  |
+60 |
| Dolenjske Toplice | |
+52 |
| Isola | |
+70 |
| Koper | |
+70 |
| Kranjska Gora | |
+52 |
| Ljubljana | |
+58 |
| Maribor | |
+58 |
| Piran | |
+70 |
| Portoroz | |
+70 |
| Postojna | |
+58 |
| Rogaska Slatina | |
+54 |
| Smarjeske Toplice | |
+52 |
| Strunjan | |
+70 |
