Climate averages 1991–2020
Weather in Puerto Rico in December
In December, average daytime highs across the 7 cities listed in Puerto Rico range from 27.4°C in Caguas to 29.0°C in Mayagüez. Monthly rainfall ranges from 18 mm in Mayagüez to 58 mm in Caguas.
Long-term climate patterns, not a forecast for a particular trip.
City by city
December in Puerto Rico
| City | Average highHigh / low | Average low | Rainfall mm | Rain days |
|---|---|---|---|---|
| San Juan | 28.1°C22.1°C | 22.1°C | 48 | 12.2 |
| Bayamón | 28.1°C22.2°C | 22.2°C | 45 | 12.0 |
| Carolina | 27.9°C22.4°C | 22.4°C | 48 | 12.2 |
| Ponce | 28.0°C22.3°C | 22.3°C | 28 | 7.5 |
| Arecibo | 28.3°C22.1°C | 22.1°C | 48 | 11.4 |
| Caguas | 27.4°C22.4°C | 22.4°C | 58 | 16.5 |
| Mayagüez | 29.0°C23.5°C | 23.5°C | 18 | 4.5 |
A rain day is a local calendar day with at least 1 mm of precipitation.