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:
2025
2024
2023
The average sea water temperature in April of 2025 was 56.1°F. The highest and lowest sea temperatures during the month were 61.9°F and 52.2°F.
Monthly sea water temperature in Koper, °F
Which Slovenia resorts have warmest sea in April?
| Place name | April 2025 | April 2024 |
|---|---|---|
| Dolenjske Toplice | 56.6°F | 58.4°F |
| Portoroz | 56.5°F | 58.7°F |
| Piran | 56.5°F | 58.7°F |
| Strunjan | 56.3°F | 58.4°F |
| Bohinjsko Jezero | 56.2°F | 57.1°F |
| Isola | 56.2°F | 58.2°F |
| Koper | 56.1°F | 58.0°F |
| Cerkno | 56.1°F | 57.1°F |
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 15:07
December 16, tuesday
1800
50°F
W
4 mph
4 mph
2100
45°F
W
5 mph
5 mph
December 17, wednesday
0000
45°F
W
4 mph
4 mph
0300
46°F
W
4 mph
4 mph
0600
45°F
W
4 mph
4 mph
0900
45°F
W
3 mph
3 mph
1200
52°F
NW
3 mph
3 mph
1500
52°F
W
3 mph
3 mph
