The Costa Rica resorts with the warmest sea water temperature in September are Santa Teresa, Samara and San Jose.
Below you can see a list of all popular Costa Rica resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2026 | September 2025 | September 2024 |
|---|---|---|---|
| Santa Teresa | 90.7°F | 87.6°F | 87.8°F |
| Samara | 90.7°F | 87.4°F | 88.0°F |
| San Jose | 90.5°F | 87.6°F | 88.0°F |
| Tamarindo | 90.5°F | 87.6°F | 88.2°F |
| Cartago | 90.5°F | 87.6°F | 87.9°F |
| Heredia | 90.4°F | 87.4°F | 87.9°F |
| Jaco | 90.4°F | 87.5°F | 87.9°F |
| Quepos | 90.4°F | 87.7°F | 87.9°F |
| El Roble | 90.4°F | 87.5°F | 87.9°F |
| Alajuela | 90.3°F | 87.5°F | 87.8°F |
| Playa Flamingo | 90.2°F | 87.5°F | 88.5°F |
| Playas del Coco | 89.9°F | 87.6°F | 88.8°F |
| Limon | 88.0°F | 88.5°F | 90.0°F |
| Puerto Limon | 88.0°F | 88.5°F | 90.0°F |
| Puerto Viejo de Talamanca | 87.9°F | 88.5°F | 89.6°F |
| Cahuita | 87.8°F | 88.5°F | 89.6°F |
| Tortuguero | 87.6°F | 88.2°F | 89.7°F |
Please see following sea water temperature averages charts for the warmest Costa Rica resorts in September.
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 |  |
+74 |
| Cahuita |  |
+88 |
| El Roble | |
+86 |
| Heredia | |
+68 |
| Jaco |  |
+86 |
| Limon | |
+88 |
| Playas del Coco | |
+86 |
| Puerto Limon | |
+88 |
| Puerto Viejo de Talamanca | |
+88 |
| Quepos | |
+86 |
| Samara | |
+82 |
| San Jose | |
+68 |
| Santa Teresa | |
+86 |
| Tamarindo | |
+86 |
| Tortuguero | |
+88 |
