Average sea water temperature in August:
+78.5°F
| Minimum sea water temperature in August: | 84.9°F |
| Maximum sea water temperature in August: | 73.9°F |
Daily sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 81.3°F. The highest and lowest sea temperatures during the month were 83.8°F and 79.7°F.
Monthly sea water temperature in Koper, °F
Which Slovenia resorts have warmest sea in August?
| Place name | August 2026 | August 2025 |
|---|---|---|
| Portoroz | 81.7°F | 77.2°F |
| Piran | 81.7°F | 77.2°F |
| Strunjan | 81.5°F | 77.1°F |
| Koper | 81.3°F | 76.7°F |
| Isola | 81.2°F | 76.9°F |
| Cerkno | 79.6°F | 76.1°F |
| Bohinjsko Jezero | 79.4°F | 76.2°F |
| Dolenjske Toplice | 78.2°F | 74.0°F |
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 10:45
September 11, friday
1200
70°F
W
4 mph
4 mph
1500
72°F
W
6 mph
6 mph
1800
68°F
SW
6 mph
6 mph
2100
61°F
W
7 mph
7 mph
September 12, saturday
0000
61°F
W
7 mph
7 mph
0300
59°F
W
6 mph
6 mph
0600
55°F
W
6 mph
6 mph
0900
64°F
SW
7 mph
7 mph
