Last updated: August 22, 2025
In Arroio Grande, Brazil, the average temperature in December hovers around 22°C (72°F), offering a pleasant climate for outdoor activities. Expect temperatures to fluctuate between a comfortable 10°C (51°F) and a warm 34°C (94°F). Be prepared for some rain, as the region sees approximately 72 mm (2.9 in) of precipitation across 8 days. With an average humidity of 77%, it’s a great time to enjoy the lush surroundings while staying hydrated!
In December in Arroio Grande, the average temperature is 22°C (72°F), with maximums reaching up to 34°C (94°F) and minimums dipping as low as 10°C (51°F). This pleasant temperature range makes Arroio Grande an ideal destination for travelers seeking comfortable weather to explore outdoor activities and attractions.
In Arroio Grande in December, the precipitation amount is 72 mm (2.9 in) over a period of 8 days.
In Arroio Grande in December humidity is 77%. With average temperature 22°C (72°F), this humidity feels like walking through a warm, damp embrace, making outdoor activities both refreshing and slightly uncomfortable for travelers unaccustomed to such conditions.
In Arroio 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 Arroio Grande, you can check here.
UV Risk Categories
Weather in Arroio Grande varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Arroio Grande, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 24°C (76°F) | 135 mm (5.3 inches) | 71% | extreme |
| February Weather | 23°C (74°F) | 98 mm (3.9 inches) | 74% | extreme |
| March Weather | 22°C (72°F) | 74 mm (2.9 inches) | 76% | extreme |
| April Weather | 20°C (68°F) | 79 mm (3.1 inches) | 81% | very high |
| May Weather | 16°C (61°F) | 88 mm (3.5 inches) | 87% | moderate |
| June Weather | 14°C (57°F) | 101 mm (4.0 inches) | 86% | moderate |
| July Weather | 13°C (55°F) | 112 mm (4.4 inches) | 81% | moderate |
| August Weather | 14°C (57°F) | 119 mm (4.7 inches) | 78% | high |
| September Weather | 16°C (61°F) | 153 mm (6.0 inches) | 82% | very high |
| October Weather | 18°C (64°F) | 135 mm (5.3 inches) | 82% | extreme |
| November Weather | 20°C (69°F) | 80 mm (3.1 inches) | 79% | extreme |
| December Weather | 22°C (72°F) | 72 mm (2.9 inches) | 77% | extreme |