Current Sea Water Temperature:
+57.0°F
| Maximum Sea Water Temperature in December: | 62.2°F |
| Minimum Sea Water Temperature in December: | 53.2°F |
| Average water temperature in December: | 57.1°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 15 | 57.0°F | December 10 | 58.0°F |
| December 14 | 57.6°F | December 09 | 57.0°F |
| December 13 | 57.4°F | December 08 | 58.4°F |
| December 12 | 57.0°F | December 07 | 58.0°F |
| December 11 | 56.8°F | December 06 | 58.0°F |
When is the Warmest Sea for Opatija?
According to our data for the last three years for Opatija 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 Opatija was 76.4°F. The maximum and minimum values were 74.2°F and 80.0°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Opatija was 78.7°F. The maximum and minimum values were 76.2°F and 80.2°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Opatija was 74.9°F. The maximum and minimum values were 73.2°F and 76.2°F respectively.
Croatia Resorts:
NAME
F°
| Baska Voda |  |
+52 |
| Brela | |
+52 |
| Dubrovnik |  |
+52 |
| Hvar | |
+56 |
| Istria | |
+48 |
| Makarska |  |
+42 |
| Omis | |
+46 |
| Porec | |
+48 |
| Pula | |
+50 |
| Rijeka | |
+42 |
| Rovinj | |
+48 |
| Split | |
+46 |
| Trogir | |
+50 |
| Zadar | |
+52 |
| Zagreb | |
+38 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Opatija
Local time: 00:15
16 dec, tuesday
| 0300 |  |
38°F | SW 2 mph |
| 0600 |  |
42°F | SW 2 mph |
| 0900 |  |
46°F | SW 2 mph |
| 1200 | |
52°F | SW 2 mph |
| 1500 |  |
50°F | NW 1 mph |
| 1800 | |
48°F | W 2 mph |
| 2100 | |
48°F | SW 3 mph |
17 dec, wednesday
| 0000 | |
48°F | SW 2 mph |