Last updated: August 22, 2025
In December, the average temperature in Castro, Brazil is a pleasant 21°C (69°F). Expect a minimum of 10°C (51°F) and a maximum of 32°C (89°F), offering a wide range of comfort. However, be prepared for 176 mm (6.9 in) of precipitation over 19 days, resulting in an average humidity of 86%. Perfect for those who enjoy lush, vibrant surroundings!
In December in Castro, the average temperature is 21°C (69°F). The maximum can reach 32°C (89°F), and the minimum can be as low as 10°C (51°F). This pleasant range makes it an ideal time for travelers to explore the outdoors while enjoying comfortable weather.
In Castro in December, the precipitation amount is 176 mm (6.9 in) occurring over a period of 19 days.
In Castro in December humidity is 86%. With an average temperature of 21°C (69°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and more deliberate while traveling. The air clings to your skin, creating a sticky sensation that might slow you down, but the vibrant sights and sounds around you encourage exploration despite the sultry atmosphere.
In Castro in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Castro.
UV Risk Categories
Weather in Castro varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Castro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 21°C (70°F) | 193 mm (7.6 inches) | 85% | extreme |
| February Weather | 21°C (70°F) | 136 mm (5.3 inches) | 80% | extreme |
| March Weather | 20°C (69°F) | 132 mm (5.2 inches) | 80% | extreme |
| April Weather | 18°C (65°F) | 49 mm (1.9 inches) | 77% | extreme |
| May Weather | 16°C (61°F) | 74 mm (2.9 inches) | 76% | very high |
| June Weather | 15°C (59°F) | 102 mm (4.0 inches) | 74% | high |
| July Weather | 14°C (57°F) | 28 mm (1.1 inches) | 66% | high |
| August Weather | 15°C (59°F) | 74 mm (2.9 inches) | 57% | very high |
| September Weather | 18°C (65°F) | 65 mm (2.6 inches) | 58% | extreme |
| October Weather | 19°C (66°F) | 166 mm (6.5 inches) | 60% | extreme |
| November Weather | 19°C (67°F) | 106 mm (4.2 inches) | 78% | extreme |
| December Weather | 21°C (69°F) | 176 mm (6.9 inches) | 86% | extreme |