Average sea water temperature in April:
+55.7°F
| Minimum sea water temperature in April: | 63.5°F |
| Maximum sea water temperature in April: | 49.6°F |
Daily sea water temperature in April, °F
Show year:
2026
2025
2024
The average sea water temperature in April of 2026 was 56.3°F. The highest and lowest sea temperatures during the month were 61.3°F and 52.0°F.
Monthly sea water temperature in Koper, °F
Which Slovenia resorts have warmest sea in April?
| Place name | April 2026 | April 2025 |
|---|---|---|
| Portoroz | 57.0°F | 56.5°F |
| Piran | 57.0°F | 56.5°F |
| Strunjan | 56.8°F | 56.3°F |
| Dolenjske Toplice | 56.7°F | 56.6°F |
| Isola | 56.5°F | 56.2°F |
| Bohinjsko Jezero | 56.3°F | 56.2°F |
| Koper | 56.3°F | 56.1°F |
| Cerkno | 56.2°F | 56.1°F |
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 08:20
August 22, saturday
0900
72°F
N
4 mph
4 mph
1200
75°F
NE
2 mph
2 mph
1500
77°F
SW
2 mph
2 mph
1800
75°F
SW
6 mph
6 mph
2100
66°F
SW
6 mph
6 mph
August 23, sunday
0000
63°F
W
6 mph
6 mph
0300
61°F
W
6 mph
6 mph
0600
63°F
W
6 mph
6 mph
