Last updated: August 22, 2025
In December, the average temperature in San Justo, Argentina is a pleasant 24°C (75°F). However, temperatures can range significantly, dipping to a minimum of 9°C (48°F) and soaring up to a maximum of 39°C (103°F). Expect moderate precipitation, with an average of 128 mm (5.0 in) over 5 days, while the average humidity holds steady at 63%.
In December in San Justo, the average temperature is 24°C (75°F). Maximum temperatures can reach 39°C (103°F), while minimums can drop to as low as 9°C (48°F). Be sure to pack accordingly for a range of weather conditions during your travels!
In San Justo in December, the total precipitation amount is 128 mm (5.0 in) over a span of 5 days.
In San Justo in December humidity is 63%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making travel both enjoyable and slightly sticky, encouraging visitors to explore the outdoors while seeking shade intermittently.
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 | 25°C (78°F) | 125 mm (4.9 inches) | 54% | extreme |
| February Weather | 24°C (75°F) | 103 mm (4.1 inches) | 61% | extreme |
| March Weather | 22°C (71°F) | 95 mm (3.7 inches) | 69% | extreme |
| April Weather | 19°C (67°F) | 94 mm (3.7 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 97 mm (3.8 inches) | 85% | moderate |
| June Weather | 12°C (55°F) | 72 mm (2.9 inches) | 82% | moderate |
| July Weather | 11°C (53°F) | 59 mm (2.3 inches) | 69% | moderate |
| August Weather | 13°C (56°F) | 81 mm (3.2 inches) | 65% | high |
| September Weather | 16°C (61°F) | 90 mm (3.5 inches) | 70% | very high |
| October Weather | 18°C (65°F) | 112 mm (4.4 inches) | 63% | extreme |
| November Weather | 22°C (72°F) | 71 mm (2.8 inches) | 60% | extreme |
| December Weather | 24°C (75°F) | 128 mm (5.0 inches) | 63% | extreme |