Climate averages 1991–2020
Weather in Puerto Rico in September
In September, average daytime highs across the 7 cities listed in Puerto Rico range from 29.7°C in Ponce to 31.2°C in Arecibo. Monthly rainfall ranges from 98 mm in Mayagüez to 168 mm in Caguas.
Long-term climate patterns, not a forecast for a particular trip.
City by city
September in Puerto Rico
| City | Average highHigh / low | Average low | Rainfall mm | Rain days |
|---|---|---|---|---|
| San Juan | 31.2°C24.5°C | 24.5°C | 131 | 20.8 |
| Bayamón | 31.1°C24.6°C | 24.6°C | 122 | 20.2 |
| Carolina | 30.9°C24.6°C | 24.6°C | 131 | 20.8 |
| Ponce | 29.7°C24.5°C | 24.5°C | 124 | 18.9 |
| Arecibo | 31.2°C24.4°C | 24.4°C | 154 | 22.3 |
| Caguas | 30.1°C24.6°C | 24.6°C | 168 | 25.2 |
| Mayagüez | 30.6°C25.6°C | 25.6°C | 98 | 17.4 |
A rain day is a local calendar day with at least 1 mm of precipitation.