Last updated: August 22, 2025
In Rio Grande, Argentina, the average temperature for December hovers around 10°C (51°F). Expect a minimum of 3°C (37°F) and a pleasant maximum of 18°C (66°F). During this month, anticipate 39 mm (1.5 in) of precipitation spread over approximately 10 days and a notable average humidity of 79%.
In December in Rio Grande, the average temperature is 10°C (51°F). Maximums can reach 18°C (66°F) and minimums can be as low as 3°C (37°F). It's a great time to enjoy the mild weather and explore outdoor activities!
In Rio Grande in December, the precipitation amount is 39 mm (1.5 in) over a span of 10 days.
In Rio Grande in December, humidity is 79%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel somewhat uncomfortable unless you're properly layered.
In Rio Grande in December, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Rio Grande.
UV Risk Categories
Weather in Rio Grande varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rio Grande, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 11°C (51°F) | 49 mm (1.9 inches) | 79% | very high |
| February Weather | 11°C (52°F) | 38 mm (1.5 inches) | 80% | very high |
| March Weather | 10°C (50°F) | 59 mm (2.3 inches) | 82% | high |
| April Weather | 8°C (46°F) | 41 mm (1.6 inches) | 86% | moderate |
| May Weather | 6°C (43°F) | 51 mm (2.0 inches) | 88% | low |
| June Weather | 3°C (38°F) | 32 mm (1.3 inches) | 89% | low |
| July Weather | 3°C (37°F) | 30 mm (1.2 inches) | 89% | low |
| August Weather | 4°C (39°F) | 38 mm (1.5 inches) | 86% | moderate |
| September Weather | 5°C (41°F) | 23 mm (0.9 inches) | 83% | moderate |
| October Weather | 6°C (43°F) | 29 mm (1.1 inches) | 81% | very high |
| November Weather | 8°C (47°F) | 36 mm (1.4 inches) | 79% | extreme |
| December Weather | 10°C (51°F) | 39 mm (1.5 inches) | 79% | very high |