Last updated: August 23, 2025
In December, the average temperature in San Sebastiano al Vesuvio, Italy hovers around 13°C (56°F). Temperatures can dip to a chilly 7°C (44°F) or rise to a pleasant 18°C (64°F). Be prepared for some rain, as the area receives approximately 206 mm (8.1 in) of precipitation over 16 days. With an average humidity of 84%, expect a somewhat damp atmosphere.
In December in San Sebastiano al Vesuvio, the average temperature is 13°C (56°F). Maximums can reach 18°C (64°F), while minimums can drop to as low as 7°C (44°F). Be sure to pack layers to stay comfortable during your travels!
In San Sebastiano al Vesuvio in December, the precipitation amount is 206 mm (8.1 in) spread over 16 days.
In San Sebastiano al Vesuvio in December, humidity is 84%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel cooler and more uncomfortable for traveling, as the air clings to your skin and weighs you down with a sense of heaviness.
In San Sebastiano al Vesuvio 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 Sebastiano al Vesuvio, you can visit Hourly UV Index in San Sebastiano al Vesuvio.
UV Risk Categories
Weather in San Sebastiano al Vesuvio varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Sebastiano al Vesuvio, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 11°C (52°F) | 116 mm (4.6 inches) | 84% | moderate |
| February Weather | 12°C (53°F) | 113 mm (4.5 inches) | 76% | moderate |
| March Weather | 12°C (54°F) | 88 mm (3.4 inches) | 69% | high |
| April Weather | 14°C (58°F) | 51 mm (2.0 inches) | 70% | high |
| May Weather | 18°C (65°F) | 57 mm (2.2 inches) | 70% | very high |
| June Weather | 22°C (73°F) | 21 mm (0.8 inches) | 61% | very high |
| July Weather | 25°C (77°F) | 12 mm (0.5 inches) | 57% | very high |
| August Weather | 26°C (79°F) | 12 mm (0.5 inches) | 53% | very high |
| September Weather | 23°C (74°F) | 96 mm (3.8 inches) | 65% | very high |
| October Weather | 19°C (67°F) | 100 mm (3.9 inches) | 75% | high |
| November Weather | 16°C (62°F) | 285 mm (11.2 inches) | 81% | moderate |
| December Weather | 13°C (56°F) | 206 mm (8.1 inches) | 84% | low |