In August warmest sea in Slovenia is usually observed in the following locations: Portoroz, Piran, Strunjan.
Table below shows the average sea water temperature for marine resorts of Slovenia in August for the last three years.
| Place name | August 2025 | August 2024 | August 2023 |
|---|---|---|---|
| Portoroz | 77.2°F | 81.9°F | 79.0°F |
| Piran | 77.2°F | 81.9°F | 79.0°F |
| Strunjan | 77.1°F | 81.7°F | 79.0°F |
| Isola | 76.9°F | 81.4°F | 79.0°F |
| Koper | 76.7°F | 81.3°F | 79.1°F |
| Bohinjsko Jezero | 76.2°F | 78.6°F | 77.5°F |
| Cerkno | 76.1°F | 78.9°F | 77.6°F |
| Dolenjske Toplice | 74.0°F | 78.8°F | 77.7°F |
Charts below show average sea water temperature for Slovenia resorts with the warmest sea in August.
You can also check other months of the year to see sea temperature of Slovenia resorts at that time.
Places in Slovenia:
Name
°F
