The Romania resorts with the warmest sea water temperature in December are Eforie Nord, Mangalia and Konstanta.
Below you can see a list of all popular Romania resorts and information about sea water temperature in December for the last two years.
| Resort Name | December 2025 | December 2024 | December 2023 |
|---|---|---|---|
| Eforie Nord | 53.9°F | 50.7°F | 49.8°F |
| Mangalia | 53.5°F | 50.6°F | 49.6°F |
| Konstanta | 52.7°F | 49.7°F | 49.1°F |
| Mamaia | 52.7°F | 49.7°F | 49.2°F |
Please see following sea water temperature averages charts for the warmest Romania resorts in December.
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
Romania Resorts:
NAME
F°
| Baile Olanesti |  |
+52 |
| Baile Tusnad |  |
+46 |
| Brasov | |
+44 |
| Bucharest | |
+48 |
| Cluj Napoca |  |
+42 |
| Eforie Nord | |
+50 |
| Galati | |
+46 |
| Konstanta | |
+50 |
| Lasi | |
+48 |
| Mamaia | |
+50 |
| Mangalia | |
+54 |
| Poiana Brasov | |
+44 |
| Sinaia | |
+48 |
| Slanic Moldova | |
+52 |
| Sovata | |
+42 |
