In September warmest sea in Saint Lucia is usually observed in the following locations: Castries, Vieux Fort.
Table below shows the average sea water temperature for marine resorts of Saint Lucia in September for the last three years.
| Place name | September 2026 | September 2025 | September 2024 |
|---|---|---|---|
| Castries | 84.9°F | 85.5°F | 86.3°F |
| Vieux Fort | 84.9°F | 85.6°F | 86.5°F |
Charts below show average sea water temperature for Saint Lucia resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of Saint Lucia resorts at that time.
