Current sea water temperature:
+59.5°F
| Minimum sea water temperature in April: | 63.5°F |
| Maximum sea water temperature in April: | 49.6°F |
| Average sea water temperature in April: | 55.7°F |
| more information | |
14 days
forecast
forecast
| Koper |
monthly
weather
weather
| Koper |
Sea water temperature for the last 10 days:
| April 27 | 59.5°F | April 22 | 57.7°F |
| April 26 | 59.0°F | April 21 | 58.5°F |
| April 25 | 58.5°F | April 20 | 58.6°F |
| April 24 | 57.2°F | April 19 | 58.6°F |
| April 23 | 57.2°F | April 18 | 56.8°F |
Monthly sea water temperature, °F
When is the warmest sea in Koper?
Based on the data about daily sea water temperature for the last three years the warmest sea in Koper was noticed in August, July and September.
Monthly Sea Temperatures in Koper, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 76.7°F. The highest and lowest sea temperatures during the month were 79.2°F and 74.1°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 78.7°F. The highest and lowest sea temperatures during the month were 81.9°F and 76.5°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 75.2°F. The highest and lowest sea temperatures during the month were 77.5°F and 73.0°F.
current
weather
weather
| Koper |
weather in
May
May
| Koper |
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 23:42
April 28, tuesday
0000
55°F
W
4 mph
4 mph
0300
54°F
W
5 mph
5 mph
0600
52°F
W
5 mph
5 mph
0900
64°F
SW
3 mph
3 mph
1200
73°F
E
3 mph
3 mph
1500
72°F
E
7 mph
7 mph
1800
64°F
SE
2 mph
2 mph
2100
55°F
W
4 mph
4 mph
