Last updated: August 23, 2025
In December, the average temperature in San Giacomo, Italy is a cool 7°C (44°F). Expect temperatures to swing from a chilly -2°C (29°F) at night to a mild 17°C (63°F) during the day. With about 80 mm (3.1 in) of precipitation spread over 13 days, be prepared for some wet weather. Don't forget your umbrella, as the average humidity hovers around 78%!
In December in San Giacomo, the average temperature is 7°C (44°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -2°C (29°F). This varied climate makes it advisable for travelers to pack layers to stay comfortable during their visit.
In San Giacomo in December, the precipitation amount is 80 mm (3.1 in) spread over the course of 13 days.
In San Giacomo in December, humidity is 78%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and prompting travelers to seek cozy indoor spaces or warm beverages for comfort.
In San Giacomo 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 Giacomo, you can visit Hourly UV Index in San Giacomo.
UV Risk Categories
Weather in San Giacomo varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Giacomo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 75 mm (2.9 inches) | 78% | moderate |
| February Weather | 6°C (44°F) | 92 mm (3.6 inches) | 71% | moderate |
| March Weather | 7°C (46°F) | 103 mm (4.1 inches) | 70% | high |
| April Weather | 11°C (52°F) | 73 mm (2.9 inches) | 73% | very high |
| May Weather | 15°C (60°F) | 53 mm (2.1 inches) | 72% | very high |
| June Weather | 20°C (68°F) | 39 mm (1.5 inches) | 67% | very high |
| July Weather | 23°C (73°F) | 19 mm (0.7 inches) | 64% | very high |
| August Weather | 24°C (75°F) | 30 mm (1.2 inches) | 61% | very high |
| September Weather | 19°C (67°F) | 84 mm (3.3 inches) | 68% | very high |
| October Weather | 14°C (58°F) | 112 mm (4.4 inches) | 73% | high |
| November Weather | 11°C (52°F) | 171 mm (6.7 inches) | 77% | moderate |
| December Weather | 7°C (44°F) | 80 mm (3.1 inches) | 78% | low |