Last updated: August 31, 2025
In December, the average temperature in San Antonio, Paraguay is a warm 27°C (81°F), making it an inviting destination. However, temperatures can vary widely, with minimums dipping to 15°C (59°F) and maximums soaring up to 38°C (101°F). Expect to experience a bit of rain, as precipitation averages 110 mm (4.3 in) over about 9 days, accompanied by an average humidity of 82%.
In December, in San Antonio, the average temperature is 27°C (81°F). The maximum can reach 38°C (101°F), while the minimum can drop as low as 15°C (59°F). This range makes San Antonio an ideal destination for travelers seeking warm weather with the option for cooler evenings.
In San Antonio in December, the precipitation amount is 110 mm (4.3 in) over the course of 9 days.
In San Antonio in December humidity is 82%. With an average temperature of 27°C (81°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel more exhausting, and leaving you longing for the relief of air-conditioned spaces during your travels.
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 | 28°C (83°F) | 130 mm (5.1 inches) | 80% | extreme |
| February Weather | 27°C (81°F) | 90 mm (3.6 inches) | 74% | extreme |
| March Weather | 26°C (79°F) | 107 mm (4.2 inches) | 75% | extreme |
| April Weather | 23°C (74°F) | 129 mm (5.1 inches) | 80% | very high |
| May Weather | 20°C (68°F) | 135 mm (5.3 inches) | 80% | high |
| June Weather | 18°C (65°F) | 78 mm (3.1 inches) | 67% | moderate |
| July Weather | 17°C (63°F) | 49 mm (1.9 inches) | 61% | high |
| August Weather | 19°C (67°F) | 54 mm (2.1 inches) | 40% | very high |
| September Weather | 22°C (73°F) | 78 mm (3.1 inches) | 46% | very high |
| October Weather | 24°C (76°F) | 199 mm (7.8 inches) | 49% | extreme |
| November Weather | 26°C (79°F) | 160 mm (6.3 inches) | 72% | extreme |
| December Weather | 27°C (81°F) | 110 mm (4.3 inches) | 82% | extreme |