Last updated: August 27, 2025
In December, the average temperature in San Justo, Spain is a cool 5°C (41°F), with temperatures ranging from a chilly -4°C (25°F) to a mild 16°C (61°F). Expect about 107 mm (4.2 in) of precipitation spread over 13 days, contributing to an average humidity of 87%. Be prepared for damp conditions as you explore this stunning locale!
In December in San Justo, the average temperature is 5°C (41°F), with maximums reaching 16°C (61°F) and minimums dropping as low as -4°C (25°F). Travelers should prepare for chilly weather and pack accordingly for both mild and cold conditions.
In San Justo in December, the total precipitation amount is 107 mm (4.2 in) distributed over a span of 13 days.
In San Justo in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.
In San Justo in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in San Justo, you can visit Hourly UV Index in San Justo.
UV Risk Categories
Weather in San Justo varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Justo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (38°F) | 44 mm (1.7 inches) | 87% | low |
| February Weather | 5°C (41°F) | 79 mm (3.1 inches) | 85% | moderate |
| March Weather | 6°C (43°F) | 86 mm (3.4 inches) | 83% | high |
| April Weather | 9°C (48°F) | 100 mm (3.9 inches) | 83% | very high |
| May Weather | 13°C (55°F) | 74 mm (2.9 inches) | 84% | very high |
| June Weather | 15°C (60°F) | 92 mm (3.6 inches) | 84% | extreme |
| July Weather | 19°C (66°F) | 37 mm (1.5 inches) | 86% | very high |
| August Weather | 19°C (66°F) | 29 mm (1.1 inches) | 78% | very high |
| September Weather | 15°C (60°F) | 61 mm (2.4 inches) | 77% | very high |
| October Weather | 11°C (53°F) | 67 mm (2.7 inches) | 82% | high |
| November Weather | 6°C (43°F) | 88 mm (3.5 inches) | 86% | moderate |
| December Weather | 5°C (41°F) | 107 mm (4.2 inches) | 87% | low |