San Juan
December
Weather in San Juan for December 2025
Your guide to San Juan weather in December - trends and predictions
In general, the average temperature in San Juan at the beginning of December is 29.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 27.3 °C by the end of December.
San Juan in December brings notable rainfall, with an average of 17 rainy days and a total precipitation of 106.3 mm.
Temperatures
Rain 🌧️
14
Dry days
17
Rainy days
0
Snow days
28°/23°
Temperatures
22 km/h
Avg max wind
78 %
Avg humidity
San Juan in December average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  31° | 3 29° | 4 31° | 5 30° | 6  29° | 7  28° |
| 8 28° | 9 28° | 10 27° | 11 28° | 12  27° | 13 27° | 14 28° |
| 15 28° | 16 28° | 17 27° | 18 28° | 19 28° | 20 27° | 21 28° |
| 22 28° | 23 29° | 24 28° | 25  27° | 26 28° | 27 29° | 28 28° |
| 29 26° | 30 27° | 31 26° |
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Temperatures trend during December in San Juan
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. | Cloudy | 29° /25° | 3.7 mm | 6 | |
| 2 Dec. | Light rain shower | 31° /25° | 1.8 mm | 7 | |
| 3 Dec. | Light rain shower | 29° /25° | 1 mm | 7 | |
| 4 Dec. | Cloudy | 31° /24° | 0 mm | 7 | |
| 5 Dec. | Light rain shower | 30° /24° | 0.4 mm | 7 | |
| 6 Dec. | Partly cloudy | 29° /24° | 0 mm | 7 | |
| 7 Dec. | Fog | 28° /23° | 6.4 mm | 6 | |
| 8 Dec. | Light rain shower | 28° /24° | 0.5 mm | 7 | |
| 9 Dec. | Patchy rain possible | 28° /24° | 14 mm | 6 | |
| 10 Dec. | Light rain shower | 27° /24° | 22.8 mm | 6 | |
| 11 Dec. | Light rain shower | 28° /23° | 17.3 mm | 6 | |
| 12 Dec. | Patchy light drizzle | 27° /24° | 0.9 mm | 6 | |
| 13 Dec. | Light rain shower | 27° /24° | 33.8 mm | 6 | |
| 14 Dec. | Light rain shower | 28° /24° | 14.5 mm | 6 | |
| 15 Dec. | Light rain shower | 28° /23° | 23.5 mm | 6 | |
| 16 Dec. | Light rain shower | 28° /23° | 13.9 mm | 6 | |
| 17 Dec. | Light rain shower | 27° /24° | 21.8 mm | 6 | |
| 18 Dec. | Patchy rain possible | 28° /24° | 24.1 mm | 6 | |
| 19 Dec. | Partly cloudy | 28° /23° | 19.8 mm | 7 | |
| 20 Dec. | Patchy rain possible | 27° /23° | 1.7 mm | 6 | |
| 21 Dec. | Patchy rain possible | 28° /23° | 0.3 mm | 6 | |
| 22 Dec. | Cloudy | 28° /22° | 7.1 mm | 6 | |
| 23 Dec. | Cloudy | 29° /23° | 3.9 mm | 6 | |
| 24 Dec. | Patchy rain possible | 28° /22° | 0.3 mm | 6 | |
| 25 Dec. | Overcast | 27° /23° | 0.4 mm | 6 | |
| 26 Dec. | Patchy rain possible | 28° /22° | 2.1 mm | 6 | |
| 27 Dec. | Patchy rain possible | 29° /22° | 1.7 mm | 7 | |
| 28 Dec. | Patchy rain possible | 28° /22° | 3.9 mm | 7 | |
| 29 Dec. | Patchy rain possible | 26° /21° | 0.5 mm | 6 | |
| 30 Dec. | Patchy rain possible | 27° /22° | 0.8 mm | 6 | |
| 31 Dec. | Overcast | 26° /22° | 0.5 mm | 6 | |
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Important Notice
Our weather forecast for San Juan in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Juan forecast closer to your planned date for the most up-to-date weather information.
San Juan in December - FAQ
What are the expected maximum and minimum temperatures in San Juan during December?
During December, expect a variety of temperatures with highs around 28° and lows near 23°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Juan during December?
Significant rainfall exceeding 106.3 mm is expected in San Juan during December, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San Juan during December?
The average wind speed in San Juan during December is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in San Juan
Explore the daily rainfall trends and prepare for San Juans December weather 💧
UV exposure in San Juan during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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