Current Sea Water Temperature:
+76.2°F
| Maximum Sea Water Temperature in September: | 86.2°F |
| Minimum Sea Water Temperature in September: | 71.0°F |
| Average water temperature in September: | 76.7°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| September 28 | 76.2°F | September 23 | 77.6°F |
| September 27 | 75.8°F | September 22 | 78.4°F |
| September 26 | 76.2°F | September 21 | 78.8°F |
| September 25 | 77.4°F | September 20 | 78.0°F |
| September 24 | 76.6°F | September 19 | 78.4°F |
When is the Warmest Sea for Koper?
According to our data for the last three years for Koper the highest average sea water temperature was in August, July and September.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2026 for Koper was 84.8°F. The maximum and minimum values were 83.0°F and 87.6°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Koper was 82.8°F. The maximum and minimum values were 79.8°F and 87.6°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2026 for Koper was 80.4°F. The maximum and minimum values were 75.8°F and 85.0°F respectively.
Slovenia Resorts:
NAME
F°
| Bled |  |
+46 |
| Bohinjsko Jezero | |
+46 |
| Cerkno | |
+50 |
| Dolenjske Toplice | |
+54 |
| Isola | |
+60 |
| Koper | |
+60 |
| Kranjska Gora | |
+46 |
| Ljubljana | |
+52 |
| Maribor | |
+56 |
| Moravske Toplice | |
+58 |
| Piran | |
+60 |
| Portoroz | |
+60 |
| Rogaska Slatina | |
+54 |
| Smarjeske Toplice | |
+54 |
| Strunjan | |
+60 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Koper
Local time: 23:15
29 sep, tuesday
| 0000 |  |
60°F | W 5 mph |
| 0300 | |
58°F | W 5 mph |
| 0600 | |
58°F | W 5 mph |
| 0900 |  |
64°F | W 4 mph |
| 1200 | |
78°F | SW 2 mph |
| 1500 | |
80°F | SE 6 mph |
| 1800 | |
70°F | E 2 mph |
| 2100 | |
62°F | W 4 mph |