Average sea water temperature in May:
+64.3°F
| Minimum sea water temperature in May: | 74.3°F |
| Maximum sea water temperature in May: | 57.2°F |
Daily sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 65.5°F. The highest and lowest sea temperatures during the month were 74.3°F and 59.2°F.
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| Portoroz |
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Monthly sea water temperature in Portoroz, °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 Portoroz
Portoroz on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Portoroz
Local time: 05:38
August 22, saturday
0600
64°F
NW
4 mph
4 mph
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
