The Costa Rica resorts with the warmest sea water temperature in December are Quepos, Cartago and San Jose.
Below you can see a list of all popular Costa Rica resorts and information about sea water temperature in December for the last two years.
| Resort Name | December 2025 | December 2024 | December 2023 |
|---|---|---|---|
| Quepos | 87.1°F | 87.1°F | 89.2°F |
| Cartago | 87.0°F | 87.0°F | 89.1°F |
| San Jose | 87.0°F | 87.0°F | 89.2°F |
| Heredia | 86.9°F | 86.8°F | 89.1°F |
| Jaco | 86.9°F | 86.7°F | 88.9°F |
| Santa Teresa | 86.9°F | 86.2°F | 88.5°F |
| Alajuela | 86.8°F | 86.4°F | 88.7°F |
| El Roble | 86.7°F | 85.6°F | 88.0°F |
| Samara | 86.7°F | 86.2°F | 88.2°F |
| Limon | 86.3°F | 86.1°F | 87.0°F |
| Puerto Limon | 86.3°F | 86.1°F | 87.0°F |
| Cahuita | 86.3°F | 86.1°F | 87.1°F |
| Puerto Viejo de Talamanca | 86.2°F | 86.2°F | 87.1°F |
| Tamarindo | 86.1°F | 85.4°F | 87.6°F |
| Tortuguero | 85.8°F | 85.5°F | 86.4°F |
| Playas del Coco | 85.5°F | 84.5°F | 86.6°F |
| Playa Flamingo | 85.4°F | 84.7°F | 86.4°F |
Please see following sea water temperature averages charts for the warmest Costa Rica 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.
Costa Rica Resorts:
NAME
F°
| Alajuela |  |
+58 |
| Cahuita | |
+76 |
| Cartago | |
+56 |
| Jaco |  |
+80 |
| Limon | |
+78 |
| Playa Flamingo |  |
+80 |
| Playas del Coco | |
+80 |
| Puerto Limon | |
+76 |
| Puerto Viejo de Talamanca | |
+74 |
| Quepos | |
+70 |
| Samara | |
+78 |
| San Jose | |
+56 |
| Santa Teresa | |
+82 |
| Tamarindo | |
+80 |
| Tortuguero | |
+76 |
