Last updated: August 27, 2025
In Union de San Antonio, Mexico, the average temperature in December is a mild 15°C (60°F). Expect a minimum of 0°C (33°F) and a maximum of 29°C (84°F), providing a pleasant range for outdoor activities. With an average precipitation of just 6 mm (0.2 in) over 1 day, the month is generally dry, though the average humidity lingers at a comfortable 81%. Enjoy the balance of warmth and refreshing breezes!
In December in Union de San Antonio, the average temperature is 15°C (60°F). The maximum can reach 29°C (84°F) and the minimum can be as low as 0°C (33°F). This varied climate makes it essential to pack layers for your travels to Union de San Antonio.
In Union de San Antonio in December, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.
In Union de San Antonio in December, humidity is 81%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sluggish and draining, which can challenge even the best-prepared traveler.
In Union de San Antonio in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Union de San Antonio.
UV Risk Categories
Weather in Union de San Antonio varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Union de San Antonio, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 15°C (60°F) | 7 mm (0.3 inches) | 74% | very high |
| February Weather | 18°C (64°F) | 9 mm (0.4 inches) | 65% | extreme |
| March Weather | 21°C (70°F) | 4 mm (0.2 inches) | 58% | extreme |
| April Weather | 23°C (73°F) | 1 mm (0.1 inches) | 58% | extreme |
| May Weather | 24°C (75°F) | 29 mm (1.2 inches) | 67% | extreme |
| June Weather | 23°C (73°F) | 152 mm (6.0 inches) | 76% | extreme |
| July Weather | 20°C (69°F) | 173 mm (6.8 inches) | 67% | extreme |
| August Weather | 21°C (69°F) | 137 mm (5.4 inches) | 68% | extreme |
| September Weather | 20°C (68°F) | 139 mm (5.5 inches) | 81% | extreme |
| October Weather | 20°C (68°F) | 48 mm (1.9 inches) | 83% | extreme |
| November Weather | 18°C (64°F) | 14 mm (0.6 inches) | 84% | very high |
| December Weather | 15°C (60°F) | 6 mm (0.2 inches) | 81% | very high |