Current Sea Water Temperature:
+58.0°F
| Maximum Sea Water Temperature in December: | 62.0°F |
| Minimum Sea Water Temperature in December: | 53.0°F |
| Average water temperature in December: | 57.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 13 | 58.0°F | December 08 | 59.2°F |
| December 12 | 58.2°F | December 07 | 58.8°F |
| December 11 | 58.2°F | December 06 | 58.8°F |
| December 10 | 58.4°F | December 05 | 58.6°F |
| December 09 | 59.0°F | December 04 | 58.8°F |
When is the Warmest Sea for Istria?
According to our data for the last three years for Istria 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 2025 for Istria was 79.4°F. The maximum and minimum values were 77.8°F and 81.6°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Istria was 81.0°F. The maximum and minimum values were 79.0°F and 83.4°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Istria was 77.6°F. The maximum and minimum values were 75.2°F and 79.4°F respectively.
Croatia Resorts:
NAME
F°
| Baska Voda |  |
+52 |
| Brela | |
+52 |
| Dubrovnik | |
+54 |
| Hvar | |
+56 |
| Istria | |
+48 |
| Klek | |
+46 |
| Makarska | |
+44 |
| Omis | |
+46 |
| Porec | |
+48 |
| Pula | |
+50 |
| Rijeka | |
+40 |
| Rovinj | |
+50 |
| Split | |
+46 |
| Zadar |  |
+52 |
| Zagreb | |
+38 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Istria
Local time: 00:29
14 dec, sunday
| 0300 |  |
48°F | W 4 mph |
| 0600 | |
48°F | W 4 mph |
| 0900 |  |
48°F | SW 4 mph |
| 1200 |  |
54°F | SW 1 mph |
| 1500 | |
54°F | E 2 mph |
| 1800 |  |
50°F | SW 2 mph |
| 2100 | |
48°F | W 3 mph |
15 dec, monday
| 0000 | |
48°F | W 3 mph |