Last updated: June 18, 2025
In December, the average temperature in Brussels, Canada hovers around -2°C (30°F), with minimum lows plummeting to -23°C (-10°F) and occasional highs reaching up to 15°C (60°F). Expect around 83 mm (3.3 in) of precipitation spread over 18 days, contributing to an average humidity level of 87%. Be prepared for chilly yet variable weather!
In December in Brussels, the average temperature is -2°C (30°F). Maximums can reach 15°C (60°F), while minimums can plunge as low as -23°C (-10°F). This climate fluctuation means travelers should prepare for a wide range of weather conditions.
In Brussels in December, the precipitation amount is 83 mm (3.3 in) over a duration of 18 days.
In Brussels in December, humidity is 87%. With an average temperature of -2°C (30°F), this humidity feels like an icy blanket wrapping around you, making travel uncomfortable and adding a biting chill to the air that seeps into your bones.
In Brussels 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 Brussels, you can visit Hourly UV Index in Brussels.
UV Risk Categories
Weather in Brussels varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Brussels, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 77 mm (3.0 inches) | 90% | low |
| February Weather | -5°C (24°F) | 87 mm (3.4 inches) | 90% | moderate |
| March Weather | 0°C (32°F) | 74 mm (2.9 inches) | 87% | moderate |
| April Weather | 5°C (42°F) | 105 mm (4.1 inches) | 87% | very high |
| May Weather | 13°C (55°F) | 102 mm (4.0 inches) | 82% | very high |
| June Weather | 18°C (65°F) | 98 mm (3.9 inches) | 81% | very high |
| July Weather | 21°C (70°F) | 86 mm (3.4 inches) | 79% | very high |
| August Weather | 20°C (68°F) | 126 mm (4.9 inches) | 80% | very high |
| September Weather | 16°C (61°F) | 98 mm (3.9 inches) | 81% | high |
| October Weather | 10°C (50°F) | 123 mm (4.8 inches) | 84% | moderate |
| November Weather | 2°C (36°F) | 103 mm (4.1 inches) | 88% | moderate |
| December Weather | -2°C (30°F) | 83 mm (3.3 inches) | 87% | low |