In October 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 October for the last three years.
| Place name | October 2026 | October 2025 | October 2024 |
|---|---|---|---|
| Portoroz | 71.3°F | 67.1°F | 67.1°F |
| Piran | 71.3°F | 67.1°F | 67.1°F |
| Strunjan | 71.1°F | 67.0°F | 67.0°F |
| Isola | 70.9°F | 66.9°F | 67.0°F |
| Koper | 70.8°F | 66.9°F | 66.8°F |
| Cerkno | 69.2°F | 65.6°F | 65.6°F |
| Bohinjsko Jezero | 69.0°F | 65.4°F | 65.5°F |
| Dolenjske Toplice | 67.0°F | 65.4°F | 65.2°F |
Charts below show average sea water temperature for Slovenia resorts with the warmest sea in October.
You can also check other months of the year to see sea temperature of Slovenia resorts at that time.
Places in Slovenia:
Name
°F
