Last updated: August 22, 2025
In December, the average temperature in San Isidro, Argentina is a pleasant 23°C (73°F). Expect a temperature range from a cool 10°C (50°F) to a warm 34°C (94°F). The month brings about 66 mm (2.6 in) of precipitation over approximately 7 days, resulting in an average humidity of 56%.
In December in San Isidro, the average temperature is 23°C (73°F). Maximum temperatures can reach 34°C (94°F), while the minimum can drop as low as 10°C (50°F). Overall, it’s a great time for travelers to enjoy mild weather, making it ideal for outdoor activities and exploration.
In San Isidro in December, the precipitation amount is 66 mm (2.6 in) over a period of 7 days.
In San Isidro in December, humidity is 56%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that makes traveling feel slightly sticky, yet still comfortable enough to explore outdoors without feeling overwhelmed.
In San Isidro 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 Isidro, you can check here.
UV Risk Categories
Weather in San Isidro varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Isidro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 25°C (77°F) | 59 mm (2.3 inches) | 50% | extreme |
| February Weather | 23°C (75°F) | 72 mm (2.9 inches) | 61% | extreme |
| March Weather | 22°C (71°F) | 77 mm (3.0 inches) | 66% | extreme |
| April Weather | 19°C (66°F) | 82 mm (3.2 inches) | 80% | high |
| May Weather | 15°C (59°F) | 80 mm (3.2 inches) | 85% | moderate |
| June Weather | 12°C (54°F) | 66 mm (2.6 inches) | 80% | moderate |
| July Weather | 11°C (52°F) | 75 mm (3.0 inches) | 69% | moderate |
| August Weather | 12°C (55°F) | 51 mm (2.0 inches) | 66% | high |
| September Weather | 15°C (59°F) | 86 mm (3.4 inches) | 72% | very high |
| October Weather | 17°C (63°F) | 103 mm (4.1 inches) | 63% | very high |
| November Weather | 21°C (69°F) | 77 mm (3.0 inches) | 59% | extreme |
| December Weather | 23°C (73°F) | 66 mm (2.6 inches) | 56% | extreme |