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December Weather in Brussels, United States

Last updated: June 24, 2025

In Brussels, United States, the average temperature for December hovers around -2°C (29°F), with a chill that can plunge as low as -23°C (-9°F) and peak at a mild 15°C (59°F). Expect 56 mm (2.2 in) of precipitation spread over 8 days, coupled with a high average humidity of 87% that keeps the air feeling crisp. Stay warm!

December Temperature in Brussels

In December in Brussels, the average temperature is -2°C (29°F), with maximums reaching up to 15°C (59°F) and minimums dropping as low as -23°C (-9°F). Be prepared for a range of temperatures when traveling to Brussels during this time, ensuring you pack both warm and mild weather clothing.

December Weather in Brussels: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Brussels, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brussels, December typically has an average temperature of -2°C (29°F), with highs reaching up to 15°C (59°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec222232405264717063513729
Data source: Temperature data for Brussels generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Brussels

In Brussels in December, the precipitation amount is 56 mm (2.2 in) over the course of 8 days.

December Precipitation Trends in Brussels

The chart displays monthly precipitation patterns in Brussels, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Brussels, December typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4250589295101909666995356
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Brussels

In Brussels in December humidity is 87%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it challenging to enjoy outdoor activities.

December Average Humidity in Brussels

This chart illustrates the average monthly humidity levels in Brussels, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Brussels is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Brussels

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.

Maximum UV Index Levels in Brussels for December

The chart shows the monthly maximum UV Index (UVI) for Brussels in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Brussels typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Brussels December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Brussels Compares to Other Months

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.

This table compares monthly weather conditions in Brussels, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)42 mm (1.6 inches)89%low
February Weather-5°C (22°F)50 mm (2.0 inches)90%moderate
March Weather0°C (32°F)58 mm (2.3 inches)87%moderate
April Weather5°C (41°F)92 mm (3.6 inches)84%high
May Weather11°C (53°F)95 mm (3.8 inches)77%very high
June Weather18°C (64°F)101 mm (4.0 inches)75%very high
July Weather22°C (72°F)90 mm (3.6 inches)74%very high
August Weather21°C (70°F)96 mm (3.8 inches)73%very high
September Weather17°C (63°F)66 mm (2.6 inches)78%high
October Weather11°C (51°F)99 mm (3.9 inches)84%moderate
November Weather3°C (37°F)53 mm (2.1 inches)89%moderate
December Weather-2°C (29°F)56 mm (2.2 inches)87%low

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