At this moment warmest sea in Slovenia was observed in the following locations: Portoroz, Piran, Strunjan.
You can find the full list of Slovenia marine locations in the table below. It shows current sea temperature values and averages for current and upcoming months.
| Place name | Current sea temp |
October 2025 | November 2025 |
|---|---|---|---|
| Portoroz | 72.7°F | 67.1°F | 61.6°F |
| Piran | 72.7°F | 67.1°F | 61.6°F |
| Strunjan | 72.7°F | 67.0°F | 61.3°F |
| Koper | 72.5°F | 66.9°F | 60.9°F |
| Isola | 72.5°F | 66.9°F | 61.0°F |
| Bohinjsko Jezero | 70.7°F | 65.4°F | 59.2°F |
| Cerkno | 70.7°F | 65.6°F | 59.4°F |
| Dolenjske Toplice | 67.6°F | 65.4°F | 60.5°F |
Charts below show average sea water temperature for Slovenia resorts with the warmest sea.
You can also check other months of the year to see sea temperature of Slovenia resorts at that time.
Places in Slovenia:
Name
°F
