Average sea water temperature in May:
+64.0°F
| Minimum sea water temperature in May: | 72.5°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 62.0°F. The highest and lowest sea temperatures during the month were 65.3°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 | 62.5°F | 65.3°F |
| Piran | 62.5°F | 65.3°F |
| Strunjan | 62.3°F | 65.2°F |
| Isola | 62.1°F | 65.1°F |
| Koper | 62.0°F | 64.9°F |
| Cerkno | 61.3°F | 63.3°F |
| Bohinjsko Jezero | 61.3°F | 63.2°F |
| Dolenjske Toplice | 60.8°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: 03:33
May 18, monday
0600
46°F
W
5 mph
5 mph
0900
61°F
NW
1 mph
1 mph
1200
66°F
E
5 mph
5 mph
1500
66°F
E
7 mph
7 mph
1800
64°F
NE
5 mph
5 mph
2100
52°F
W
3 mph
3 mph
May 19, tuesday
0000
50°F
W
5 mph
5 mph
0300
48°F
W
5 mph
5 mph
