Current sea water temperature:
+77.0°F
| Minimum sea water temperature in September: | 80.4°F |
| Maximum sea water temperature in September: | 68.7°F |
| Average sea water temperature in September: | 73.8°F |
| more information | |
14 days
forecast
forecast
| Istria |
monthly
weather
weather
| Istria |
Sea water temperature for the last 10 days:
| September 14 | 77.0°F | September 9 | 79.5°F |
| September 13 | 77.4°F | September 8 | 79.2°F |
| September 12 | 77.7°F | September 7 | 79.3°F |
| September 11 | 78.8°F | September 6 | 79.7°F |
| September 10 | 78.8°F | September 5 | 79.7°F |
Monthly sea water temperature, °F
When is the warmest sea in Istria?
Based on the data about daily sea water temperature for the last three years the warmest sea in Istria was noticed in August, July and September.
Monthly Sea Temperatures in Istria, °F
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 80.5°F. The highest and lowest sea temperatures during the month were 82.4°F and 79.0°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 78.9°F. The highest and lowest sea temperatures during the month were 82.0°F and 77.4°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 74.8°F. The highest and lowest sea temperatures during the month were 76.5°F and 72.7°F.
current
weather
weather
| Istria |
weather in
September
September
| Istria |
Best time for vacation in Istria
Istria on a weather map
Places in Croatia:
Name
°F
24 Hours Forecast
Istria
Local time: 13:14
September 14, monday
1500
73°F
SE
7 mph
7 mph
1800
75°F
SE
5 mph
5 mph
2100
73°F
S
6 mph
6 mph
September 15, tuesday
0000
72°F
W
5 mph
5 mph
0300
72°F
NW
4 mph
4 mph
0600
70°F
SW
6 mph
6 mph
0900
70°F
SW
4 mph
4 mph
1200
73°F
E
5 mph
5 mph
