Last updated: August 22, 2025
In December, the average temperature in San Antonio, Chile is a pleasant 16°C (61°F), with a minimum of 9°C (49°F) and a maximum reaching 26°C (78°F). The region experiences minimal precipitation, with only 1 mm (0.0 in) over 0 days, ensuring plenty of dry weather. Additionally, the average humidity is comfortably low at 39%, making it an ideal time to enjoy the outdoors!
In December in San Antonio, the average temperature is 16°C (61°F). Maximums can reach 26°C (78°F), while minimums can drop to as low as 9°C (49°F). This weather makes San Antonio an ideal destination for travelers seeking mild temperatures and pleasant outdoor activities.
In San Antonio in December, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.
In San Antonio in December humidity is 39%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing breeze that enhances the overall comfort of traveling, making it easy to explore without feeling weighed down.
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 | 17°C (62°F) | 6 mm (0.2 inches) | 41% | extreme |
| February Weather | 17°C (62°F) | 3 mm (0.1 inches) | 41% | extreme |
| March Weather | 16°C (60°F) | 3 mm (0.1 inches) | 46% | extreme |
| April Weather | 14°C (57°F) | 9 mm (0.4 inches) | 52% | very high |
| May Weather | 12°C (54°F) | 43 mm (1.7 inches) | 64% | moderate |
| June Weather | 11°C (51°F) | 107 mm (4.2 inches) | 71% | moderate |
| July Weather | 10°C (50°F) | 47 mm (1.9 inches) | 75% | moderate |
| August Weather | 10°C (51°F) | 38 mm (1.5 inches) | 73% | high |
| September Weather | 11°C (53°F) | 16 mm (0.6 inches) | 56% | very high |
| October Weather | 13°C (55°F) | 14 mm (0.6 inches) | 61% | extreme |
| November Weather | 15°C (59°F) | 3 mm (0.1 inches) | 52% | extreme |
| December Weather | 16°C (61°F) | 1 mm (0.0 inches) | 39% | extreme |