The Costa Rica resorts with the warmest sea water temperature in September are Puerto Viejo de Talamanca, Limon and Puerto Limon.
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 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Puerto Viejo de Talamanca | 88.5°F | 89.6°F | 89.7°F |
| Limon | 88.5°F | 90.0°F | 89.8°F |
| Puerto Limon | 88.5°F | 90.0°F | 89.8°F |
| Cahuita | 88.5°F | 89.6°F | 89.6°F |
| Tortuguero | 88.2°F | 89.7°F | 89.5°F |
| Quepos | 87.7°F | 87.9°F | 89.6°F |
| Cartago | 87.6°F | 87.9°F | 89.7°F |
| Playas del Coco | 87.6°F | 88.8°F | 90.2°F |
| Santa Teresa | 87.6°F | 87.8°F | 89.7°F |
| Tamarindo | 87.6°F | 88.2°F | 90.3°F |
| San Jose | 87.6°F | 88.0°F | 89.7°F |
| Playa Flamingo | 87.5°F | 88.5°F | 89.9°F |
| Jaco | 87.5°F | 87.9°F | 89.7°F |
| Alajuela | 87.5°F | 87.8°F | 89.6°F |
| El Roble | 87.5°F | 87.9°F | 89.6°F |
| Heredia | 87.4°F | 87.9°F | 89.6°F |
| Samara | 87.4°F | 88.0°F | 90.3°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.
Sea Water
Temperature
Temperature
| Puerto Viejo de Talamanca |
Sea Water
Temperature
Temperature
| Limon |
Sea Water
Temperature
Temperature
| Puerto Limon |
Costa Rica Resorts:
NAME
F°
| Alajuela |  |
+54 |
| Cahuita |  |
+76 |
| Heredia | |
+56 |
| Jaco | |
+78 |
| Limon | |
+76 |
| Playa Flamingo |  |
+76 |
| Playas del Coco | |
+76 |
| Puerto Limon | |
+76 |
| Puerto Viejo de Talamanca | |
+72 |
| Quepos | |
+70 |
| Samara | |
+76 |
| San Jose | |
+54 |
| Santa Teresa |  |
+80 |
| Tamarindo | |
+76 |
| Tortuguero | |
+74 |
