Sea temperature and swimming season in Puerto Rico
When the sea is warm enough to swim in 15 coastal cities in Puerto Rico.
| City | Warmest | Coldest | Swimming season |
|---|---|---|---|
| San Juan | 29.6°C Sep | 26.7°C Mar | all year |
| Ponce | 29.9°C Sep | 27.0°C Feb | all year |
| Arecibo | 29.7°C Sep | 26.8°C Mar | all year |
| Mayagüez | 29.9°C Sep | 27.2°C Feb | all year |
| Fajardo | 29.7°C Sep | 26.8°C Feb | all year |
| Vega Baja | 29.7°C Sep | 26.8°C Mar | all year |
| Barceloneta | 29.7°C Sep | 26.8°C Mar | all year |
| Guayama | 29.9°C Sep | 27.0°C Feb | all year |
| Aguadilla | 29.8°C Sep | 26.9°C Mar | all year |
| Río Grande | 29.7°C Sep | 26.8°C Feb | all year |
| Isabel Segunda | 29.7°C Sep | 26.8°C Feb | all year |
| Guánica | 29.9°C Sep | 27.1°C Feb | all year |
| Salinas | 29.9°C Sep | 27.0°C Feb | all year |
| Quebradillas | 29.7°C Sep | 26.9°C Mar | all year |
| Lajas | 29.9°C Sep | 27.2°C Feb | all year |
Knowing the temperature is only half of it. What to wear, and why cold shock is the real risk →
Season uses 19°C. Why that number, and where the data comes from