Average sea water temperature in May:
+64.1°F
| Minimum sea water temperature in May: | 75.0°F |
| Maximum sea water temperature in May: | 56.3°F |
Daily sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 65.4°F. The highest and lowest sea temperatures during the month were 75.0°F and 57.6°F.
Monthly sea water temperature in Koper, °F
Which Slovenia resorts have warmest sea in May?
| Place name | May 2026 | May 2025 |
|---|---|---|
| Portoroz | 65.5°F | 65.3°F |
| Piran | 65.5°F | 65.3°F |
| Strunjan | 65.5°F | 65.2°F |
| Koper | 65.4°F | 64.9°F |
| Isola | 65.4°F | 65.1°F |
| Cerkno | 64.3°F | 63.3°F |
| Bohinjsko Jezero | 64.3°F | 63.2°F |
| Dolenjske Toplice | 62.4°F | 62.3°F |
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 23:10
July 23, thursday
0000
63°F
W
4 mph
4 mph
0300
61°F
W
4 mph
4 mph
0600
61°F
W
4 mph
4 mph
0900
73°F
W
1 mph
1 mph
1200
79°F
E
3 mph
3 mph
1500
81°F
SE
6 mph
6 mph
1800
77°F
SE
5 mph
5 mph
2100
64°F
W
4 mph
4 mph
