Last updated: August 27, 2025
In December, the average temperature in Castelo Branco, Portugal hovers around 10°C (50°F), offering a cool yet pleasant climate. Expect a minimum temperature of -3°C (28°F) and a maximum of 19°C (66°F), making it essential to layer your clothing. With 65 mm (2.6 in) of precipitation spread over 7 days, don’t forget your umbrella! Additionally, the average humidity is around 85%, adding a touch of moisture to the air.
In December in Castelo Branco, the average temperature is 10°C (50°F). Maximums can reach 19°C (66°F), and minimums can drop as low as -3°C (28°F). This variation makes Castelo Branco an ideal destination for travelers who enjoy moderate weather with the possibility of experiencing both mild and cooler conditions.
In Castelo Branco in December, the total precipitation amount is 65 mm (2.6 in) over a span of 7 days.
In Castelo Branco in December, humidity is 85%. With an average temperature of 10°C (50°F), this humidity feels like a heavy, damp blanket surrounding you, making travel feel sluggish and uncomfortable as you navigate through the thick, moist air.
In Castelo Branco in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Castelo Branco, you can check the information here.
UV Risk Categories
Weather in Castelo Branco varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Castelo Branco, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (47°F) | 33 mm (1.3 inches) | 85% | moderate |
| February Weather | 11°C (52°F) | 50 mm (2.0 inches) | 75% | moderate |
| March Weather | 12°C (54°F) | 78 mm (3.1 inches) | 72% | high |
| April Weather | 15°C (58°F) | 75 mm (2.9 inches) | 70% | very high |
| May Weather | 19°C (67°F) | 29 mm (1.2 inches) | 70% | very high |
| June Weather | 22°C (72°F) | 12 mm (0.5 inches) | 63% | extreme |
| July Weather | 25°C (77°F) | 3 mm (0.1 inches) | 60% | very high |
| August Weather | 25°C (78°F) | 3 mm (0.1 inches) | 60% | very high |
| September Weather | 23°C (73°F) | 33 mm (1.3 inches) | 67% | very high |
| October Weather | 18°C (65°F) | 53 mm (2.1 inches) | 74% | high |
| November Weather | 12°C (54°F) | 76 mm (3.0 inches) | 83% | moderate |
| December Weather | 10°C (50°F) | 65 mm (2.6 inches) | 85% | moderate |