Average sea water temperature in September:
+73.5°F
| Minimum sea water temperature in September: | 81.1°F |
| Maximum sea water temperature in September: | 67.3°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 76.8°F. The highest and lowest sea temperatures during the month were 79.7°F and 73.8°F.
Monthly sea water temperature in Cerkno, °F
Which Slovenia resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Portoroz | 78.9°F | 75.3°F |
| Piran | 78.9°F | 75.3°F |
| Strunjan | 78.6°F | 75.2°F |
| Koper | 78.5°F | 75.2°F |
| Isola | 78.4°F | 75.1°F |
| Cerkno | 76.8°F | 73.6°F |
| Bohinjsko Jezero | 76.6°F | 73.3°F |
| Dolenjske Toplice | 76.3°F | 71.7°F |
Best time for vacation in Cerkno
Cerkno on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Cerkno
Local time: 13:41
September 20, sunday
1500
70°F
NE
4 mph
4 mph
1800
64°F
NE
3 mph
3 mph
2100
57°F
S
3 mph
3 mph
September 21, monday
0000
57°F
S
4 mph
4 mph
0300
57°F
S
5 mph
5 mph
0600
55°F
SW
5 mph
5 mph
0900
61°F
SW
4 mph
4 mph
1200
63°F
W
6 mph
6 mph
