Last updated: August 27, 2025
In December, the average temperature in Sao Juliao, Portugal hovers around 10°C (50°F), with daytime highs reaching up to 19°C (66°F) and nighttime lows dipping as low as -2°C (29°F). Expect approximately 69 mm (2.7 in) of precipitation over 8 days, contributing to an average humidity of 87%—perfect for cozy indoor activities or exploring the local sights!
In December in Sao Juliao, the average temperature is 10°C (50°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -2°C (29°F). It's a time when travelers can enjoy moderate weather, but it's wise to pack layers to accommodate the temperature fluctuations.
In Sao Juliao in December, the precipitation amount is 69 mm (2.7 in) that falls over a period of 8 days.
In Sao Juliao in December humidity is 87%. With an average temperature of 10°C (50°F), this humidity feels like a heavy cloak wrapping around you, making every step feel laborious and the air thick with moisture, challenging your comfort while traveling.
In Sao Juliao 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 Sao Juliao, you can check the information here.
UV Risk Categories
Weather in Sao Juliao varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sao Juliao, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (47°F) | 32 mm (1.3 inches) | 87% | moderate |
| February Weather | 11°C (51°F) | 47 mm (1.9 inches) | 76% | moderate |
| March Weather | 12°C (54°F) | 87 mm (3.4 inches) | 68% | high |
| April Weather | 14°C (58°F) | 81 mm (3.2 inches) | 64% | very high |
| May Weather | 19°C (66°F) | 41 mm (1.6 inches) | 62% | very high |
| June Weather | 22°C (71°F) | 13 mm (0.5 inches) | 47% | extreme |
| July Weather | 25°C (77°F) | 4 mm (0.2 inches) | 46% | very high |
| August Weather | 25°C (78°F) | 7 mm (0.3 inches) | 42% | very high |
| September Weather | 23°C (73°F) | 31 mm (1.2 inches) | 53% | very high |
| October Weather | 18°C (65°F) | 51 mm (2.0 inches) | 69% | high |
| November Weather | 12°C (54°F) | 72 mm (2.9 inches) | 85% | moderate |
| December Weather | 10°C (50°F) | 69 mm (2.7 inches) | 87% | moderate |