Current Sea Water Temperature:
+54.4°F
| Maximum Sea Water Temperature in April: | 65.4°F |
| Minimum Sea Water Temperature in April: | 49.6°F |
| Average water temperature in April: | 56.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| April 01 | 54.4°F | March 27 | 54.8°F |
| March 31 | 54.2°F | March 26 | 55.6°F |
| March 30 | 54.4°F | March 25 | 54.8°F |
| March 29 | 54.6°F | March 24 | 54.4°F |
| March 28 | 55.0°F | March 23 | 54.0°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 |  |
+56 |
| Hvar | |
+54 |
| Istria | |
+54 |
| Klek | |
+50 |
| Makarska |  |
+44 |
| Omis | |
+52 |
| Porec | |
+54 |
| Pula |  |
+52 |
| Rijeka | |
+48 |
| Rovinj | |
+54 |
| Split | |
+52 |
| Zadar | |
+50 |
| Zagreb | |
+50 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Opatija
Local time: 16:42
01 apr, wednesday
| 1800 |  |
48°F | SW 21 mph |
| 2100 |  |
46°F | SW 22 mph |
02 apr, thursday
| 0000 |  |
44°F | SW 22 mph |
| 0300 | |
44°F | SW 22 mph |
| 0600 | |
44°F | SW 19 mph |
| 0900 | |
44°F | SW 17 mph |
| 1200 | |
48°F | SW 18 mph |
| 1500 | |
52°F | SW 17 mph |