Last updated: August 22, 2025
In December, the average temperature in St. Sebastian, Austria hovers around -1°C (30°F). Expect chilly conditions with a minimum drop to -17°C (2°F) and an occasional warm maximum of 10°C (50°F). Rain may grace the area, bringing 118 mm (4.6 in) of precipitation over approximately 18 days. Add to that an average humidity of 89%, making it a notably crisp and damp time of year.
In December in St. Sebastian, the average temperature is -1°C (30°F), with maximums reaching 10°C (50°F) and minimums dropping as low as -17°C (2°F). Travelers should be prepared for cold weather and dress in layers to stay comfortable during their visit.
In St. Sebastian in December, the total precipitation amount reaches 118 mm (4.6 in) over the course of 18 days.
In St. Sebastian in December humidity is 89%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that wraps around you, making outdoor travel uncomfortable and brisk, as the cold air sharpens the dampness, leaving you feeling colder than the thermometer suggests.
In St. Sebastian 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 St. Sebastian, you can visit Hourly UV Index in St. Sebastian.
UV Risk Categories
Weather in St. Sebastian varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in St. Sebastian, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 92 mm (3.6 inches) | 90% | low |
| February Weather | -1°C (31°F) | 68 mm (2.7 inches) | 84% | moderate |
| March Weather | 2°C (35°F) | 76 mm (3.0 inches) | 78% | high |
| April Weather | 6°C (43°F) | 82 mm (3.2 inches) | 73% | high |
| May Weather | 10°C (51°F) | 177 mm (7.0 inches) | 71% | very high |
| June Weather | 16°C (61°F) | 140 mm (5.5 inches) | 73% | very high |
| July Weather | 16°C (62°F) | 168 mm (6.6 inches) | 70% | very high |
| August Weather | 17°C (62°F) | 178 mm (7.0 inches) | 60% | very high |
| September Weather | 12°C (54°F) | 131 mm (5.2 inches) | 65% | high |
| October Weather | 8°C (46°F) | 100 mm (3.9 inches) | 84% | moderate |
| November Weather | 3°C (37°F) | 73 mm (2.9 inches) | 89% | moderate |
| December Weather | -1°C (30°F) | 118 mm (4.6 inches) | 89% | low |