In September warmest sea in Costa Rica is usually observed in the following locations: Santa Teresa, Samara, San Jose.
Table below shows the average sea water temperature for marine resorts of Costa Rica in September for the last three years.
| Place name | September 2026 | September 2025 | September 2024 |
|---|---|---|---|
| Santa Teresa | 86.6°F | 83.8°F | 84.0°F |
| Samara | 86.6°F | 83.7°F | 84.2°F |
| San Jose | 86.5°F | 83.8°F | 84.2°F |
| Cartago | 86.5°F | 83.9°F | 84.1°F |
| Tamarindo | 86.4°F | 83.8°F | 84.4°F |
| Quepos | 86.4°F | 83.9°F | 84.1°F |
| Heredia | 86.4°F | 83.7°F | 84.1°F |
| Jaco | 86.3°F | 83.7°F | 84.1°F |
| El Roble | 86.3°F | 83.7°F | 84.1°F |
| Alajuela | 86.3°F | 83.7°F | 84.0°F |
| Playa Flamingo | 86.2°F | 83.8°F | 84.7°F |
| Playas del Coco | 86.0°F | 83.8°F | 84.9°F |
| Limon | 84.3°F | 84.6°F | 86.0°F |
| Puerto Limon | 84.3°F | 84.6°F | 86.0°F |
| Puerto Viejo de Talamanca | 84.2°F | 84.7°F | 85.7°F |
| Cahuita | 84.1°F | 84.6°F | 85.7°F |
| Tortuguero | 84.0°F | 84.4°F | 85.8°F |
Charts below show average sea water temperature for Costa Rica resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of Costa Rica resorts at that time.
Places in Costa Rica:
Name
°F
