December Weather in Brussels, Belgium

Last updated: August 21, 2025

December in Brussels, Belgium ushers in a chill as temperatures fluctuate, with a maximum reaching a mild 15°C (59°F) and an average hovering around 5°C (42°F). As the month progresses, the mercury can dip to a frosty -5°C (24°F), making warm attire essential for visitors and locals alike. With 93 mm (3.7 in) of precipitation falling over 17 days, expect a damp atmosphere accentuated by a high humidity level of 92%. This combination of cool temperatures and frequent rain creates a quintessential winter ambiance, perfect for exploring the festive charm of the city.

December Temperature in Brussels

As December settles in Brussels, the chill of winter becomes palpable, with temperatures ranging from a brisk minimum of -5°C (24°F) to a mild maximum of 15°C (59°F). The average temperature hovers around a chilly 5°C (42°F), signaling a shift toward colder days. Notably, this month marks a departure from the late autumn temperatures, dipping down compared to November’s milder conditions. Despite the cold, December brings a charm to the city, as festive lights and holiday markets sparkle against the crisp air, inviting both locals and visitors to embrace the season. As winter approaches, layers and warm beverages become essential companions for exploring Brussels’ cozy streets and seasonal festivities.

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 ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec394245505664666660544542
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 December, Brussels experiences its wettest month of the year, with an average precipitation of 93 mm (3.7 in) over 17 days. This trend marks a significant increase compared to the preceding months, as the city transitions into the cold season. The rainiest period sees December outpacing November's 57 mm and averaging over 30 mm more than the drier month of April. With persistent drizzles and occasional downpours, the culmination of the fall and early winter in Brussels often translates to a lively, albeit damp, atmosphere, perfect for cozy indoor activities or festive holiday markets. This wetter weather is a key characteristic that defines December in the Belgian capital, adding to its unique charm.

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 {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec656971375866718055765793
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Brussels

In December, Brussels experiences a notable crescendo in humidity, with levels reaching 92%—a figure that ties with November for the year's highest. As we transition from autumn to winter, the trend indicates a general rise in humidity during these final months, contrasting sharply with the summer's drier conditions, which see the lowest humidity at 76% in August. The colder months are marked by consistently elevated humidity, peaking in late autumn and early winter, creating a damp yet cozy atmosphere that envelops the city. This seasonal shift highlights how Brussels, with its chilly, moist December, offers a captivatingly different ambiance compared to its warmer months, inviting residents and visitors alike to embrace the unique charm of winter in the heart of Europe.

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 {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%85%82%82%80%76%82%89%92%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Brussels

In Brussels, Belgium, December ushers in a notably low UV Index of 1, indicating minimal sun exposure risks for residents and visitors alike. Following a gradual ascent from winter through to summer months, where the UV Index peaks at 8 in both June and July, there's a robust decline as the year ends. With a burn time of 45 minutes, December's sunlight poses little threat, similar to the preceding months of January and November. This consistent low exposure provides a welcome respite from the higher UV levels encountered during the sunnier spring and summer periods. For more detailed information on UV levels, explore the Brussels UV Index.

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 {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
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.

December Sunshine in Brussels

Brussels experiences a notable shift in daylight as the year winds down, with December bringing 143 hours of sunshine. While this is a drop compared to previous months, it continues a gradual decline from the sunniest summer months, peaking in July with 406 hours. As the days grow shorter amidst the winter chill, December’s sunlight contributes a cozy glow to the festive spirit in the city. This decline is part of a larger trend, with monthly sunshine hours tapering off from the vibrancy of spring and early summer. Despite the cloudier days, December still offers a unique charm, allowing residents and visitors alike to enjoy the warm ambiance of the holiday season, even in the muted winter light.

Monthly Sunshine Duration in Brussels: December Highlighted

The December sunshine duration represents the total number of hours Brussels experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec121h200h266h346h394h398h406h379h319h240h190h143h
Data source: Brussels December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Brussels During December

In Brussels, Belgium, December tends to be one of the cloudier months, with a chance of sunny weather hovering around a modest 15%. This figure reflects a notable trend seen as the year progresses, with sunny days gradually increasing from the depths of winter towards spring. After a scant 11% in January, the likelihood of sunshine climbs steadily, peaking at a cheerful 50% in April before tapering off again in the late summer months. Thus, while December may offer limited opportunities for sunlight, the contrast with earlier and later months highlights a seasonal rhythm that many locals and visitors alike appreciate.

Percentage of Sunny Days in December in Brussels

The chart illustrates the percentage of sunny days in Brussels throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Brussels experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec11%30%40%50%33%34%34%29%36%32%24%16%
Data source: Brussels December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Brussels in December

In Brussels, Belgium, December brings the shortest daylight duration of the year, with only 8 hours of sunlight. This pattern of diminishing daylight stretches from the previous month in November, maintaining a steady gloom that often lingers through winter. As the year progresses into March, residents can look forward to a gradual increase, with daylight stretching to 11 hours, peaking at 16 hours in the light-filled days of June. After the summer’s peak, daylight begins to wane again, dropping back to 10 hours by October and returning to a dimmer scene by December. This cyclical trend beautifully captures the rhythm of the seasons, oscillating between the long, sunlit days of summer and the shorter, cozy hours of winter.

Average Daylight Hours in Brussels for December

The chart illustrates the variation in daylight duration in Brussels throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 31m10h 2m11h 55m13h 50m15h 31m16h 23m15h 55m14h 25m12h 34m10h 39m8h 56m8h 2m
Data source: Brussels daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Brussels

As the year winds down, December in Brussels experiences an average wind speed of 4.2 m/s (9 mph), reflecting a slight uptick from the preceding months. This shift signifies a trend where winter months tend to showcase a resurgence in wind intensity, particularly following the calmer summer and early autumn breezes. Interestingly, December's wind speed is just shy of January and February's averages, which hover around 4.4 m/s (10 mph), suggesting that the city's gusts grow more frequent and assertive as the cold settles in. Overall, this seasonal fluctuation paints a picture of a city where the winds playfully dance through the streets, preparing Brussels for the cozy embrace of winter.

Average December Wind Speed in Brussels

The chart displays monthly wind speed patterns in Brussels, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.64.03.44.42.83.33.43.04.33.34.2 m/s
Data source: Brussels December wind data, generated using information from the Copernicus Climate Change Service.

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.

December tends to be slightly milder than January, with average temperatures ranging from a minimum of -5°C (24°F) to a maximum of 15°C (59°F). In comparison, January experiences cooler conditions, with minimum temperatures dropping to -7°C (20°F) and a maximum of 14°C (57°F). While December sees more precipitation at 93 mm (3.7 in) over 17 days, January has less precipitation at 65 mm (2.5 in) over 12 days, making it generally drier. Humidity levels remain relatively high in both months, with December at 92% and January slightly lower at 91%. For more detailed information, you can check Brussels weather in January.

In December, the weather is characterized by a minimum temperature of -5°C (24°F) and an average of 5°C (42°F), peaking at 15°C (59°F). The month experiences higher precipitation, with 93 mm (3.7 in) over 17 days, and maintains a high humidity level of 92%. In contrast, February tends to be a bit cooler, with a minimum of -8°C (17°F) and a slightly higher maximum of 19°C (66°F), while the average temperature remains the same at 5°C (42°F). Precipitation decreases to 69 mm (2.7 in) over 12 days, and humidity is slightly lower at 89%. For more detailed information on February weather, you can visit Brussels weather in February.

In December, the weather tends to be cooler with an average temperature around 5°C (42°F), ranging from a minimum of -5°C (24°F) to a maximum of 15°C (59°F). The month experiences significant precipitation, totaling 93 mm (3.7 in) over about 17 days, accompanied by high humidity levels at 92%. In contrast, March offers a gradual warming trend, with an average temperature of 7°C (45°F) and a wider maximum range reaching up to 23°C (74°F). Precipitation is lower in March at 70 mm (2.8 in) across 14 days, and humidity slightly decreases to 87%. For more details on the weather specifics in March, check out Brussels weather in March.

In December, the weather is characterized by colder temperatures, with a minimum of -5°C (24°F) and an average of 5°C (42°F), peaking at a maximum of 15°C (59°F). The month is also quite damp, receiving approximately 93 mm (3.7 in) of precipitation over 17 days and maintaining a high humidity level of 92%. In contrast, April sees a significant warming trend, with minimum temperatures around -4°C (26°F) and an average rising to 10°C (50°F), reaching maximums of 27°C (80°F). Precipitation in April drops to 37 mm (1.5 in) over just 8 days, accompanied by slightly lower humidity at 85%. For more details, check out Brussels weather in April.

In December, the weather is significantly colder, with temperatures ranging from a frigid -5°C (24°F) to a mild 15°C (59°F), averaging around 5°C (42°F). This month also experiences higher precipitation, with around 93 mm (3.7 in) falling over 17 days, and humidity levels are elevated at 92%. In contrast, May brings warmer temperatures, with a minimum of 1°C (33°F), an average of 13°C (57°F), and a maximum reaching up to 31°C (88°F). Precipitation during this month is lower, at 58 mm (2.3 in) over 12 days, accompanied by a more comfortable humidity level of 82%. For a more detailed look at the weather in May, you can visit Brussels weather in May.

December and June present a stark contrast in weather. In December, temperatures can drop to a chilly -5°C (24°F) at night, with an average of 5°C (42°F) and daytime highs reaching only 15°C (59°F). This month experiences significant humidity at 92% and frequent precipitation, with rain falling on 17 days and totaling 93 mm (3.7 in). In contrast, June brings milder and more pleasant weather, with nighttime lows around 7°C (44°F) and average highs of 18°C (65°F), soaring up to 32°C (91°F) on warmer days. Additionally, June boasts lower humidity at 82% and less rainfall, accumulating only 66 mm (2.6 in) over 9 days. For more details on June's conditions, you can visit Brussels weather in June.

In December, Brussels experiences considerably colder weather, with temperatures ranging from a chilly -5°C (24°F) to a milder 15°C (59°F) and an average of around 5°C (42°F). The month is characterized by high humidity at 92% and frequent precipitation, with rain occurring on 17 days and totaling 93 mm (3.7 inches). In contrast, July boasts significantly warmer temperatures, with a minimum of 8°C (46°F) and a maximum of 39°C (102°F), reaching an average of 19°C (66°F). Precipitation is lower in July, with 71 mm (2.8 inches) over 11 days and a more comfortable humidity level of 80%. For more specifics on the warm summer months, you can check out Brussels weather in July.

In December, the weather is characterized by much colder temperatures, with a minimum of -5°C (24°F) and an average of 5°C (42°F), peaking at a maximum of 15°C (59°F). The month sees substantial precipitation, totaling 93 mm (3.7 in) across 17 days, combined with high humidity levels of 92%. In contrast, August offers a much milder climate, featuring a minimum temperature of 8°C (46°F) and an average of 19°C (66°F), reaching highs of 36°C (97°F). With a total precipitation of 80 mm (3.2 in) over 14 days, August also boasts a lower humidity level of 76%. For more details on this month, visit Brussels weather in August.

The weather significantly differs between December and September. In December, temperatures can drop to a chilly -5°C (24°F) at night, with daily averages around 5°C (42°F) and highs reaching 15°C (59°F). The month is characterized by higher precipitation, totaling 93 mm (3.7 in) over 17 days, contributing to the overall humidity level of 92%. In contrast, September enjoys more moderate temperatures, with lows around 4°C (39°F) and pleasant highs up to 33°C (91°F). It also experiences less rainfall, averaging 55 mm (2.2 in) over just 9 days, and a slightly lower humidity level of 82%. For more insights on September weather, you can visit Brussels weather in September.

In comparing the weather of December and October, one can observe significant differences in temperature and precipitation. December tends to be much colder, with minimum temperatures dropping to -5°C (24°F), while October has milder nights with a minimum of 1°C (34°F). The average temperatures also reflect this shift; October boasts a comfortable average of 12°C (54°F), in stark contrast to December's cooler average of 5°C (42°F). Precipitation levels are relatively similar, with December receiving 93 mm (3.7 in) over 17 days, compared to October's 76 mm (3.0 in) over 13 days. Moreover, humidity levels remain high in both months, but December slightly edges higher at 92%, compared to October's 89%. For a more detailed look at October's weather, you can check Brussels weather in October.

In comparing the weather of December and November, December tends to be colder overall, with a minimum temperature of -5°C (24°F) compared to November's minimum of -2°C (28°F). The average temperature also drops slightly, from 7°C (45°F) in November to 5°C (42°F) in December, while the maximum temperature sees a decrease from 18°C (65°F) to 15°C (59°F). December experiences significantly more precipitation, with 93 mm (3.7 in) over 17 days, compared to November's 57 mm (2.2 in) across 11 days. Despite the increased precipitation, both months maintain a high humidity level of 92%. For more detailed information, you can check Brussels weather in November.

Compare Brussels's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Brussels

As December unfolds in Brussels, the weather takes a notable turn, showcasing the city’s characteristic winter chill. With average temperatures dipping to a brisk 5°C (42°F) and the possibility of frosty days reaching as low as -5°C (24°F), residents and visitors alike should brace for a stark contrast to the milder autumn months. While this month brings festive cheer, it also introduces increased precipitation, with rain gracing roughly half the days, contributing to the city’s humid atmosphere that hovers around a notable 92%. For those seeking to understand Brussels' seasonal changes in detail, exploring the full spectrum of Brussels Climate is highly recommended.