Last updated: August 28, 2025
In December, the average temperature in San Antonio, Uruguay is a pleasant 22°C (72°F). However, temperatures can vary significantly, with minimums dropping to 8°C (46°F) and maximums soaring to 36°C (97°F). Expect some rain, as the area receives an average of 65 mm (2.5 in) of precipitation over the course of 7 days, accompanied by an average humidity level of around 65%.
In December in San Antonio, the average temperature is 22°C (72°F). Maximums can reach 36°C (97°F) and minimums can be as low as 8°C (46°F). It's a great time to visit for those who enjoy mild weather with occasional warm days.
In San Antonio in December, the precipitation amount is 65 mm (2.5 in) over a span of 7 days.
In San Antonio in December, humidity is 65%. With an average temperature of 22°C (72°F), this humidity feels like a warm, tropical embrace that can make outdoor activities quite sticky, yet still enjoyable if you stay hydrated and take breaks in the shade.
In San Antonio in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Antonio, you can check here.
UV Risk Categories
Weather in San Antonio varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Antonio, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 24°C (75°F) | 69 mm (2.7 inches) | 63% | extreme |
| February Weather | 23°C (73°F) | 97 mm (3.8 inches) | 69% | extreme |
| March Weather | 21°C (70°F) | 75 mm (2.9 inches) | 73% | extreme |
| April Weather | 18°C (65°F) | 75 mm (3.0 inches) | 79% | high |
| May Weather | 14°C (58°F) | 109 mm (4.3 inches) | 82% | moderate |
| June Weather | 12°C (54°F) | 106 mm (4.2 inches) | 80% | moderate |
| July Weather | 11°C (52°F) | 101 mm (4.0 inches) | 72% | moderate |
| August Weather | 12°C (54°F) | 90 mm (3.5 inches) | 72% | high |
| September Weather | 14°C (58°F) | 86 mm (3.4 inches) | 76% | very high |
| October Weather | 16°C (61°F) | 91 mm (3.6 inches) | 71% | extreme |
| November Weather | 19°C (67°F) | 67 mm (2.6 inches) | 68% | extreme |
| December Weather | 22°C (72°F) | 65 mm (2.5 inches) | 65% | extreme |