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 55.8°F. The highest and lowest sea temperatures during the month were 59.5°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 | 56.6°F | 56.5°F |
| Piran | 56.6°F | 56.5°F |
| Strunjan | 56.3°F | 56.3°F |
| Dolenjske Toplice | 56.2°F | 56.6°F |
| Isola | 56.0°F | 56.2°F |
| Bohinjsko Jezero | 55.9°F | 56.2°F |
| Cerkno | 55.9°F | 56.1°F |
| Koper | 55.8°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: 01:09
April 28, tuesday
0300
54°F
W
5 mph
5 mph
0600
52°F
W
5 mph
5 mph
0900
64°F
SW
3 mph
3 mph
1200
73°F
E
3 mph
3 mph
1500
72°F
E
7 mph
7 mph
1800
64°F
SE
2 mph
2 mph
2100
55°F
W
4 mph
4 mph
April 29, wednesday
0000
54°F
W
5 mph
5 mph
