Current sea water temperature:
+54.3°F
| Minimum sea water temperature in December: | 60.1°F |
| Maximum sea water temperature in December: | 50.2°F |
| Average sea water temperature in December: | 55.2°F |
| more information | |
14 days
forecast
forecast
| Koper |
monthly
weather
weather
| Koper |
Sea water temperature for the last 10 days:
| December 29 | 54.3°F | December 24 | 55.0°F |
| December 28 | 54.3°F | December 23 | 55.4°F |
| December 27 | 54.5°F | December 22 | 56.1°F |
| December 26 | 54.9°F | December 21 | 55.4°F |
| December 25 | 55.6°F | December 20 | 54.7°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
January
January
| Koper |
Best time for vacation in Koper
Koper on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Koper
Local time: 13:45
December 29, monday
1500
48°F
SE
2 mph
2 mph
1800
41°F
W
1 mph
1 mph
2100
36°F
NW
2 mph
2 mph
December 30, tuesday
0000
34°F
NW
3 mph
3 mph
0300
34°F
NW
4 mph
4 mph
0600
34°F
W
5 mph
5 mph
0900
36°F
W
5 mph
5 mph
1200
46°F
SW
12 mph
12 mph
