Last updated: August 22, 2025
In December, the average temperature in San Isidro, Argentina is a pleasant 21°C (69°F). You'll experience a comfortable range, with minimums dipping to 8°C (47°F) and maximums soaring up to 34°C (93°F). Expect 117 mm (4.6 in) of precipitation spread over 12 days, while average humidity hovers around 61%.
In December in San Isidro, the average temperature is 21°C (69°F), with maximums reaching 34°C (93°F) and minimums dipping as low as 8°C (47°F). Overall, visitors can expect a warm climate with some variability, making it ideal for exploring diverse outdoor activities.
In San Isidro in December, the total precipitation amount is 117 mm (4.6 in), occurring over a span of 12 days.
In San Isidro in December, humidity is 61%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace, making outdoor exploration enjoyable but slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade.
In San Isidro in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Isidro.
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 | 22°C (71°F) | 100 mm (3.9 inches) | 63% | extreme |
| February Weather | 20°C (68°F) | 133 mm (5.2 inches) | 66% | extreme |
| March Weather | 18°C (65°F) | 87 mm (3.4 inches) | 68% | extreme |
| April Weather | 16°C (61°F) | 63 mm (2.5 inches) | 83% | very high |
| May Weather | 12°C (54°F) | 34 mm (1.3 inches) | 82% | high |
| June Weather | 9°C (48°F) | 14 mm (0.6 inches) | 72% | moderate |
| July Weather | 9°C (48°F) | 6 mm (0.3 inches) | 57% | high |
| August Weather | 11°C (53°F) | 6 mm (0.2 inches) | 42% | high |
| September Weather | 14°C (58°F) | 28 mm (1.1 inches) | 51% | very high |
| October Weather | 17°C (63°F) | 49 mm (1.9 inches) | 47% | extreme |
| November Weather | 19°C (67°F) | 84 mm (3.3 inches) | 58% | extreme |
| December Weather | 21°C (69°F) | 117 mm (4.6 inches) | 61% | extreme |