Last updated: August 27, 2025
In December, the average temperature in San Antonio, Peru hovers around 25°C (78°F), creating a pleasantly warm atmosphere. However, temperatures can vary significantly, with minimums dropping to 18°C (65°F) and maximums soaring to 35°C (95°F). During this month, expect about 154 mm (6.1 in) of precipitation spread over 25 days, leading to an average humidity level of 89%—perfect for those who enjoy a tropical ambiance!
In December in San Antonio, the average temperature is 25°C (78°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop to as low as 18°C (65°F). This comfortable climate makes it an ideal time for travelers to explore and enjoy outdoor activities in San Antonio.
In San Antonio in December, the precipitation amount is 154 mm (6.1 in) over the course of 25 days.
In San Antonio in December, humidity is 89%. With an average temperature of 25°C (78°F), this humidity feels like a warm, dense blanket enveloping you, making travel slightly uncomfortable as you sweat and struggle to keep cool while exploring the local sights.
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 | 25°C (78°F) | 181 mm (7.1 inches) | 80% | extreme |
| February Weather | 25°C (78°F) | 171 mm (6.7 inches) | 76% | extreme |
| March Weather | 25°C (77°F) | 290 mm (11.4 inches) | 81% | extreme |
| April Weather | 25°C (77°F) | 235 mm (9.3 inches) | 86% | extreme |
| May Weather | 24°C (76°F) | 203 mm (8.0 inches) | 86% | extreme |
| June Weather | 24°C (76°F) | 121 mm (4.8 inches) | 70% | extreme |
| July Weather | 24°C (75°F) | 68 mm (2.7 inches) | 47% | extreme |
| August Weather | 25°C (77°F) | 60 mm (2.4 inches) | 37% | extreme |
| September Weather | 26°C (79°F) | 66 mm (2.6 inches) | 42% | extreme |
| October Weather | 26°C (78°F) | 141 mm (5.6 inches) | 62% | extreme |
| November Weather | 26°C (78°F) | 206 mm (8.1 inches) | 76% | extreme |
| December Weather | 25°C (78°F) | 154 mm (6.1 inches) | 89% | extreme |