Average temperature in December is 25.7 °C
Average daytime temperature is 27.4 °C
Average night temperature is 23.9 °C
Absolute maximum temperature: 29.5 °C
Absolute minimum temperature: 21.5 °C
Number of sunny days: 7
Number of rainy days: 24
Number of snow days:
Precipitation sum: 68 mm
* Weather data for San Juan Puerto Rico is based on climate observations for 2023 year
| December (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 28.4 | 28.5 | 27.5 | 29.4 | 28.3 | 29.5 | 27.8 | 28.3 | 28.4 | 27.4 | 28.1 | 27.7 | 27.6 | 27.5 | 27.3 | 27 | 27.6 | 28.4 | 27.6 | 26.4 | 26.1 | 25.9 | 26.3 | 26.4 | 26.2 | 26.2 | 26.5 | 26.4 | 27.4 | 26.7 | 27.1 |
| Apparent max temperature | 30.6 | 30.7 | 30.2 | 32.2 | 30.5 | 32.5 | 32.2 | 31.7 | 29.7 | 29.1 | 29.3 | 28.3 | 26.6 | 27 | 27.6 | 28.9 | 28.5 | 30.1 | 29.4 | 29.2 | 29.6 | 28.2 | 30 | 29.9 | 29.3 | 29.2 | 29.7 | 29.9 | 30.2 | 29.4 | 30.8 |
| Mean temperature | 27.1 | 27.7 | 26.8 | 26.5 | 26.7 | 27 | 26 | 26.1 | 27.3 | 26.2 | 26.2 | 26.7 | 26.7 | 26.3 | 25.3 | 25 | 26 | 26.3 | 25.9 | 24.6 | 25.1 | 24 | 24.2 | 24.3 | 24.3 | 24.7 | 24.7 | 24.3 | 24.7 | 24.9 | 25.6 |
| Apparent mean temperature | 28.3 | 28.5 | 28 | 28.8 | 28.2 | 28.7 | 28.3 | 28.8 | 27.8 | 25.7 | 26.8 | 25.9 | 24.1 | 24.6 | 25 | 25.1 | 25.9 | 27.2 | 26.9 | 26.2 | 26.1 | 25.4 | 25 | 26.1 | 25.1 | 26.8 | 26 | 26 | 25.1 | 26.3 | 27.1 |
| Minimum temperature | 25.7 | 27.2 | 25.9 | 24.3 | 24.6 | 25.2 | 23.4 | 23.8 | 25.7 | 24.8 | 24 | 25.9 | 25.1 | 25.1 | 23.7 | 23.2 | 24.3 | 25 | 24.6 | 22.2 | 23.1 | 22.4 | 21.7 | 22.2 | 21.9 | 22.9 | 22.1 | 22 | 21.5 | 22.8 | 23.2 |
| Apparent min temperature | 29 | 29.3 | 28.9 | 30.1 | 29.3 | 30.4 | 30.3 | 29.7 | 28.7 | 27.2 | 28.3 | 27.5 | 25.8 | 26 | 26.3 | 26.8 | 27.2 | 28 | 28.3 | 28.2 | 28.5 | 26.9 | 27.3 | 27.8 | 27.7 | 27.8 | 28.4 | 28 | 27.7 | 27.8 | 28.2 |
| December | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Sunshine duration (h) | 10.3 | 10.3 | 10.2 | 10.2 | 10.3 | 10.3 | 10.3 | 10.3 | 10.3 | 9.7 | 10.2 | 10.3 | 10.2 | 10 | 7.4 | 9.4 | 10.3 | 9.8 | 9.2 | 10.2 | 9.9 | 9.5 | 10.2 | 10.2 | 9.7 | 10.2 | 10.3 | 10.1 | 10.3 | 10.3 | 9.9 |
| Precipitation (mm) | 1.4 | 0 | 1 | 0.2 | 0 | 0 | 0.4 | 1.8 | 0.3 | 5.4 | 2.3 | 1.7 | 3.5 | 1.6 | 7 | 12.7 | 2.5 | 0 | 0 | 0.8 | 3.8 | 8 | 8.4 | 0.2 | 0.7 | 2.5 | 0.5 | 0.1 | 0 | 0 | 1.2 |
| Precipitation hours | 6 | 0 | 7 | 2 | 0 | 0 | 2 | 5 | 3 | 19 | 8 | 11 | 11 | 10 | 17 | 17 | 18 | 0 | 0 | 3 | 14 | 23 | 10 | 2 | 5 | 12 | 4 | 1 | 0 | 0 | 6 |
| Wind speed (m/s) | 28.4 | 24.7 | 23.8 | 23.2 | 27.8 | 22.1 | 15.1 | 27.2 | 31.4 | 37.1 | 33 | 36 | 38.3 | 37.7 | 28.4 | 29.6 | 32.1 | 30.7 | 26.8 | 14.8 | 18 | 18.9 | 14.5 | 16.9 | 13.5 | 16.1 | 13.3 | 18.2 | 24.7 | 24.1 | 18.9 |
In December 2023, the highest daytime temperature in San Juan was 29.5°C.
While the minimum temperature at night dropped to 21.5°C.
The average nighttime and daytime temperatures during December in San Juan are 23.9°C and 27.4°C respectively.
The precipitation sum in December is about 68 mm.