Average sea water temperature in September:
+74.1°F
| Minimum sea water temperature in September: | 82.2°F |
| Maximum sea water temperature in September: | 68.9°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 77.1°F. The highest and lowest sea temperatures during the month were 81.3°F and 73.4°F.
Monthly sea water temperature in Isola, °F
Which Slovenia resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Portoroz | 77.6°F | 75.3°F |
| Piran | 77.6°F | 75.3°F |
| Strunjan | 77.4°F | 75.2°F |
| Koper | 77.1°F | 75.2°F |
| Isola | 77.1°F | 75.1°F |
| Cerkno | 75.2°F | 73.6°F |
| Bohinjsko Jezero | 75.0°F | 73.3°F |
| Dolenjske Toplice | 74.6°F | 71.7°F |
Best time for vacation in Isola
Isola on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Isola
Local time: 12:01
November 01, sunday
1500
50°F
SW
14 mph
14 mph
1800
50°F
SW
14 mph
14 mph
2100
46°F
SW
14 mph
14 mph
November 02, monday
0000
46°F
SW
14 mph
14 mph
0300
48°F
SW
18 mph
18 mph
0600
48°F
SW
15 mph
15 mph
0900
50°F
SW
16 mph
16 mph
1200
54°F
SW
16 mph
16 mph
