The Puerto Rico resorts with the warmest sea water temperature in October are Mayaguez, Ponce and Isabella.
Below you can see a list of all popular Puerto Rico resorts and information about sea water temperature in October for the last two years.
| Resort Name | October 2026 | October 2025 | October 2024 |
|---|---|---|---|
| Mayaguez | 89.9°F | 89.8°F | 91.1°F |
| Ponce | 89.8°F | 89.7°F | 91.2°F |
| Isabella | 89.7°F | 89.4°F | 90.7°F |
| Aguadilla | 89.7°F | 89.8°F | 91.1°F |
| Arecibo | 89.6°F | 89.3°F | 90.6°F |
| San Juan | 89.6°F | 89.5°F | 91.1°F |
Please see following sea water temperature averages charts for the warmest Puerto Rico resorts in October.
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.
