Last updated: August 22, 2025
In San Justo, Argentina, the average temperature in December hovers around 25°C (77°F). However, you can expect a range, with minimums dipping to 11°C (52°F) and maximums soaring to 39°C (102°F). During this month, average precipitation is about 82 mm (3.2 in) over the course of 5 days, and the average humidity sits comfortably at 57%.
In December in San Justo, the average temperature is 25°C (77°F), with maximums often reaching 39°C (102°F) and minimums dropping to as low as 11°C (52°F). This variability makes it essential for travelers to pack for both warm days and cooler evenings.
In San Justo in December, the precipitation amount is 82 mm (3.2 in) over a span of 5 days.
In San Justo in December, humidity is 57%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls and outdoor adventures, though it's advisable to stay hydrated and take breaks in the shade.
In San Justo 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 Justo, you can check here.
UV Risk Categories
Weather in San Justo varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Justo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 26°C (79°F) | 130 mm (5.1 inches) | 51% | extreme |
| February Weather | 24°C (76°F) | 123 mm (4.8 inches) | 57% | extreme |
| March Weather | 22°C (72°F) | 105 mm (4.1 inches) | 65% | extreme |
| April Weather | 20°C (68°F) | 97 mm (3.8 inches) | 76% | very high |
| May Weather | 16°C (60°F) | 117 mm (4.6 inches) | 83% | high |
| June Weather | 13°C (55°F) | 60 mm (2.4 inches) | 78% | moderate |
| July Weather | 12°C (54°F) | 44 mm (1.7 inches) | 58% | moderate |
| August Weather | 14°C (57°F) | 62 mm (2.5 inches) | 54% | high |
| September Weather | 17°C (63°F) | 59 mm (2.3 inches) | 59% | very high |
| October Weather | 20°C (67°F) | 111 mm (4.4 inches) | 50% | extreme |
| November Weather | 23°C (73°F) | 86 mm (3.4 inches) | 53% | extreme |
| December Weather | 25°C (77°F) | 82 mm (3.2 inches) | 57% | extreme |