The Slovenia resorts with the warmest sea water temperature in July are Portoroz, Piran and Strunjan.
Below you can see a list of all popular Slovenia resorts and information about sea water temperature in July for the last two years.
| Resort Name | July 2026 | July 2025 | July 2024 |
|---|---|---|---|
| Portoroz | 83.8°F | 82.2°F | 83.7°F |
| Piran | 83.8°F | 82.2°F | 83.7°F |
| Strunjan | 83.6°F | 82.1°F | 83.5°F |
| Isola | 83.5°F | 82.0°F | 83.3°F |
| Koper | 83.4°F | 81.9°F | 83.5°F |
| Bohinjsko Jezero | 82.4°F | 80.4°F | 80.7°F |
| Cerkno | 82.4°F | 80.4°F | 80.9°F |
| Dolenjske Toplice | 81.6°F | 79.3°F | 81.7°F |
Please see following sea water temperature averages charts for the warmest Slovenia resorts in July.
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 |  |
+50 |
| Bohinjsko Jezero | |
+50 |
| Bovec | |
+50 |
| Cerkno | |
+52 |
| Dolenjske Toplice | |
+56 |
| Isola | |
+64 |
| Koper | |
+72 |
| Kranjska Gora | |
+50 |
| Ljubljana | |
+52 |
| Maribor | |
+52 |
| Piran | |
+72 |
| Portoroz | |
+64 |
| Rogaska Slatina |  |
+54 |
| Smarjeske Toplice | |
+56 |
| Strunjan | |
+64 |
