Last updated: August 22, 2025
In Rio Grande, Brazil, the average temperature in December hovers around 22°C (71°F), offering a pleasant climate for outdoor activities. You can expect temperatures to range from a comfortable 15°C (59°F) at their coolest to a warm 28°C (82°F) at their peak. However, be prepared for some moisture, as the area receives an average precipitation of 77 mm (3.0 in) spread over 8 days, contributing to a rather high average humidity of 82%.
In December in Rio Grande, the average temperature is 22°C (71°F). Maximums can reach 28°C (82°F), while minimums can dip to as low as 15°C (59°F). This pleasant climate makes it an ideal destination for travelers seeking mild weather and outdoor activities.
In Rio Grande in December, the precipitation amount is 77 mm (3.0 in) distributed over 8 days.
In Rio Grande in December, humidity is 82%. With an average temperature of 22°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and sweat-dripping, urging travelers to stay hydrated and seek the shade more often.
In Rio Grande 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 Rio Grande, you can check here.
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 | 24°C (75°F) | 85 mm (3.3 inches) | 79% | extreme |
| February Weather | 24°C (75°F) | 75 mm (2.9 inches) | 81% | extreme |
| March Weather | 23°C (73°F) | 87 mm (3.4 inches) | 81% | extreme |
| April Weather | 21°C (70°F) | 65 mm (2.6 inches) | 80% | very high |
| May Weather | 18°C (64°F) | 97 mm (3.8 inches) | 82% | moderate |
| June Weather | 15°C (60°F) | 99 mm (3.9 inches) | 81% | moderate |
| July Weather | 14°C (57°F) | 111 mm (4.4 inches) | 78% | moderate |
| August Weather | 14°C (58°F) | 100 mm (3.9 inches) | 80% | high |
| September Weather | 16°C (61°F) | 144 mm (5.7 inches) | 84% | very high |
| October Weather | 18°C (65°F) | 131 mm (5.2 inches) | 84% | extreme |
| November Weather | 20°C (68°F) | 78 mm (3.1 inches) | 82% | extreme |
| December Weather | 22°C (71°F) | 77 mm (3.0 inches) | 82% | extreme |