Last updated: August 22, 2025
In December, the average temperature in San Juan, Bolivia hovers around 15°C (60°F), making it a pleasant time to visit. Visitors can expect a delightful range, with minimums dipping to 7°C (44°F) and maximums reaching up to 30°C (85°F). However, be prepared for some rain, as the region experiences an average precipitation of 116 mm (4.6 in) over approximately 23 days. With an average humidity of 79%, it's advisable to enjoy the warmth while staying hydrated!
In December in San Juan, the average temperature is 15°C (60°F). Maximums can reach 30°C (85°F), while minimums can drop to as low as 7°C (44°F). It's a great time to visit, as you can enjoy mild weather with the possibility of warm days ideal for outdoor activities.
In San Juan in December, the precipitation amount is 116 mm (4.6 in) over the course of 23 days.
In San Juan in December, humidity is 79%. With an average temperature of 15°C (60°F), this humidity feels like a warm, enveloping blanket that can make traveling feel muggy and a bit stifling, requiring frequent breaks to stay refreshed and hydrated.
In San Juan in December, the maximum UV index is 18, which corresponds to an extreme exposure category. This means that the time to burn is just 10 minutes. For more detailed information, you can check the hourly UV index in San Juan.
UV Risk Categories
Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 15°C (60°F) | 98 mm (3.9 inches) | 87% | extreme |
| February Weather | 15°C (59°F) | 117 mm (4.6 inches) | 88% | extreme |
| March Weather | 14°C (58°F) | 93 mm (3.7 inches) | 89% | extreme |
| April Weather | 14°C (57°F) | 36 mm (1.4 inches) | 87% | extreme |
| May Weather | 13°C (55°F) | 11 mm (0.4 inches) | 82% | extreme |
| June Weather | 11°C (52°F) | 4 mm (0.2 inches) | 59% | very high |
| July Weather | 11°C (51°F) | 8 mm (0.3 inches) | 47% | very high |
| August Weather | 12°C (53°F) | 7 mm (0.3 inches) | 43% | extreme |
| September Weather | 14°C (58°F) | 28 mm (1.1 inches) | 60% | extreme |
| October Weather | 16°C (60°F) | 48 mm (1.9 inches) | 67% | extreme |
| November Weather | 16°C (61°F) | 60 mm (2.4 inches) | 71% | extreme |
| December Weather | 15°C (60°F) | 116 mm (4.6 inches) | 79% | extreme |