August Weather in Brussels, Belgium

Last updated: August 21, 2025

August in Brussels, Belgium, offers a dynamic weather experience characterized by warm temperatures and moderate humidity levels averaging 76%. With maximum highs reaching a sweltering 36°C (97°F), the city can see delightful warmth, although it cools down significantly at night, with minimum temperatures dropping to 8°C (46°F). The average daily temperature sits comfortably at 19°C (66°F), making it a pleasant time for outdoor activities. However, visitors should be prepared for occasional rain, as 80 mm (3.2 in) of precipitation is spread over about 14 days throughout the month, adding a refreshing contrast to the summer heat.

August Temperature in Brussels

In August, Brussels experiences some of its warmest temperatures of the year, with a minimum of 8°C (46°F) and an average of 19°C (66°F), leading to a maximum that can soar up to 36°C (97°F). This peak reflects a notable trend of increasing warmth as summer reaches its zenith, particularly when compared to the cooler months preceding it. The warmth of August provides vibrant atmospheres for outdoor activities and local festivals, often drawing crowds eager to enjoy the city's sunny charm before the autumn chill sets in. With summertime temperatures remaining consistently high, August stands out as a highlight for both locals and visitors alike.

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

The chart illustrates August 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, August 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.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Brussels

In August, Brussels experiences a notable spike in precipitation, with an average of 80 mm (3.2 in) spread over 14 days. This marks a significant increase compared to the previous months, illustrating a trend of rising rainfall as summer nears its end. With its lush greenery and vibrant atmosphere, the city transforms under the slightly moody skies, encouraging locals and visitors to embrace the charm of the season's last hurrah. As the warm summer months transition into autumn, the combination of heightened humidity and increased rainfall prepares Belgium for the lush landscapes that autumn will bring, reminding everyone of nature's cyclical beauty.

August Precipitation Trends in Brussels

The chart displays monthly precipitation patterns in Brussels, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Brussels, August typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec656971375866718055765793
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

August Humidity in Brussels

In August, Brussels experiences a noticeable drop in humidity, with levels averaging around 76%—the lowest of the year. This decline marks a shift from the earlier months, where humidity remains consistently high, peaking at 91% in January. As summer transitions into autumn, humidity levels begin to rise again in September, returning to 82%. The overall trend reveals a gradual decrease in humidity from spring to summer, culminating in a more comfortable August, before the annual uptick resumes in fall. This seasonal fluctuation not only defines Brussels' climate but also enhances the city's appeal for outdoor activities during the summer months.

August Average Humidity in Brussels

This chart illustrates the average monthly humidity levels in Brussels, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Brussels

In August, Brussels experiences a UV Index of 7, classified as high, indicating a significant potential for skin damage with extended exposure. As summer reaches its zenith, the burn time stands at 25 minutes, urging residents and visitors alike to be more vigilant about sun protection. This slight decline from July's peak of 8 suggests a transition towards milder sunlight as the season begins to change. Comparatively, the earlier months display a steady increase in UV intensity, starting from a low risk in January and February to the more critical levels observed in June and July. As autumn approaches, it's wise to remain aware of the UV variations throughout the year. For more detailed information, refer to the Brussels UV Index.

Maximum UV Index Levels in Brussels for August

The chart shows the monthly maximum UV Index (UVI) for Brussels in August, 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 August, the maximum UV index in Brussels typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Brussels August 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.

August Sunshine in Brussels

In Brussels, the month of August sees a remarkable 379 hours of sunshine, contributing to the city's vibrant summer atmosphere. This period follows a peak in July, where 406 hours of sunshine creates a lively backdrop for outdoor activities and festivals. As the summer transitions into fall, August maintains a commendable level of sunshine, though a decline is observed heading into September with 319 hours. This trend highlights a clear pattern: as the year progresses, the amount of sunlight increases from the dreary winter months, with a peak in midsummer, before gradually waning into autumn. Overall, August stands out as a sunlit gem, offering a warm embrace before the cooler months set in.

Monthly Sunshine Duration in Brussels: August Highlighted

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

Chance of Sun in Brussels During August

In Brussels, the likelihood of sunny weather experiences notable fluctuations throughout the year, with August offering a 29% chance of sunshine. This is a slight dip compared to the preceding summer months of June and July, which hover around 33% and 34%, respectively. While August tends to signal the end of the sunniest periods, it still maintains a fair chance for bright days, particularly when viewed against the backdrop of Brussels' winter months, where sunshiny opportunities drop drastically to just 11% in January. As summer wanes, this trend highlights a gentle decline in sunlight, yet August remains a month where residents and visitors can still hope to bask in the sun before autumn sets in.

Percentage of Sunny Days in August in Brussels

The chart illustrates the percentage of sunny days in Brussels throughout the year, with August 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 August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Brussels in August

In August, daylight in Brussels begins to gently wane, offering about 14 hours of sunlight each day. This follows the peak of summer in June, when the city enjoys a glorious 16 hours of daylight. As the seasons transition, August reflects a gradual shift towards the shorter days of autumn. The increase in daylight from January's mere 8 hours to October's 10 hours paints a vivid picture of Brussels basking in the vibrant summer months, with each progressive month heralding longer and sunnier days. As September approaches, the daylight slips to 12 hours, signaling the inevitable return to the cozier, darker months that follow. This ebb and flow of daylight beautifully captures the rhythm of the seasons in this charming city.

Average Daylight Hours in Brussels for August

The chart illustrates the variation in daylight duration in Brussels throughout the year, with August 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.

August Winds in Brussels

In August, Brussels experiences a gentle shift in its breezy character, with an average wind speed of 3.4 m/s (8 mph). This marks a slight increase compared to the calmer winds of June and July, but it remains modest overall. Interestingly, while August does not offer the swiftest gusts seen earlier in the year, such as those in January and October, it serves as a transitional period leading into the crisp autumn months. As the summer heat begins to wane, the soft winds contribute to the city's charming outdoor atmosphere, encouraging locals and tourists alike to enjoy the picturesque parks and streets of Brussels.

Average August Wind Speed in Brussels

The chart displays monthly wind speed patterns in Brussels, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.64.03.44.42.83.33.4 m/s3.04.33.34.2
Data source: Brussels August wind data, generated using information from the Copernicus Climate Change Service.

How August 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 August’s weather to other months in Brussels, focusing on differences in temperature, rainfall, humidity, and UV levels.

August and January in Brussels present a striking contrast in weather conditions. August boasts a much warmer climate, with average temperatures around 19°C (66°F), peaking at highs of 36°C (97°F), and a humidity level of 76%. However, it also experiences a fair amount of rainfall, totaling 80 mm (3.2 in) over about 14 days. In contrast, January is markedly cooler, with average temperatures of only 4°C (39°F) and a maximum of 14°C (57°F). The winter month is characterized by lower precipitation levels at 65 mm (2.5 in) across 12 days, yet a higher humidity of 91%. For a more detailed look at January weather in Brussels, visit Brussels weather in January.

August and February present strikingly contrasting weather patterns. August boasts a much warmer average temperature of 19°C (66°F), with high peaks of up to 36°C (97°F), making it a stark contrast to February's chill, where the temperature hovers around a much cooler average of 5°C (42°F) and can drop to as low as -8°C (17°F). Precipitation levels are also notable, with August receiving 80 mm (3.2 in) over approximately 14 days, while February sees slightly less at 69 mm (2.7 in) over 12 days. Additionally, February tends to be a more humid month, with humidity levels at 89% compared to August's 76%. For more insights on February weather, check out Brussels weather in February.

August and March present distinctly different weather experiences. August tends to be much warmer, with temperatures ranging from a minimum of 8°C (46°F) to a maximum of 36°C (97°F), while March sees much cooler conditions, with temperatures ranging from -8°C (17°F) to 23°C (74°F). Despite both months experiencing precipitation on approximately 14 days, August receives more rainfall at 80 mm (3.2 in) compared to March's 70 mm (2.8 in). Additionally, August’s humidity is slightly lower at 76%, whereas March's humidity is higher at 87%, contributing to a more brisk feel during that month. For more specific details on March weather, visit Brussels weather in March.

When comparing the weather in April and August, there is a notable contrast in temperature and precipitation. April experiences cooler temperatures with a minimum of -4°C and an average of 10°C, while August boasts hotter conditions, with temperatures ranging from a minimum of 8°C to a scorching maximum of 36°C. Precipitation is also higher in August, totaling 80 mm over 14 days, compared to April's 37 mm over just 8 days. Humidity levels are relatively high in both months, with April at 85% and August slightly lower at 76%. For more details on April's weather, you can visit Brussels weather in April.

August and May present distinct contrasts in weather. In August, the temperature range is notably wider, with a minimum of 8°C (46°F) and a maximum soaring to 36°C (97°F), averaging at a warm 19°C (66°F). In comparison, May features cooler conditions, with temperatures ranging from a chilly 1°C (33°F) to a maximum of 31°C (88°F), and an average of 13°C (57°F). Precipitation in August is slightly higher at 80 mm (3.2 in) over 14 days, compared to May's 58 mm (2.3 in) across 12 days, while humidity remains high in both months, with August at 76% and May at 82%. For a more detailed look at May weather, you can visit Brussels weather in May.

When comparing the weather in August to that of June, we can see distinct differences in temperature and precipitation. August typically features a wider temperature range with a minimum of 8°C (46°F) and a maximum of 36°C (97°F), while June has slightly cooler temperatures, ranging from 7°C (44°F) to 32°C (91°F). The average temperatures are also a bit higher in August, sitting around 19°C (66°F) compared to June's average of 18°C (65°F). Additionally, August sees more precipitation, totaling around 80 mm (3.2 in) over 14 days, compared to June’s 66 mm (2.6 in) over just 9 days. Interestingly, the humidity levels are relatively similar, with August at 76% and June slightly higher at 82%. For further details about June's weather specifically, check out Brussels weather in June.

When comparing the weather in August and July, both months share similar minimum and average temperatures, with lows of 8°C (46°F) and averages of 19°C (66°F). However, July boasts a slightly higher maximum temperature of 39°C (102°F) compared to August's peak of 36°C (97°F). In terms of precipitation, August experiences a bit more rainfall with 80 mm (3.2 in) over 14 days, whereas July sees 71 mm (2.8 in) across 11 days, suggesting that August may be wetter overall. Humidity levels remain relatively high in both months, with July at 80% and August slightly lower at 76%. For more details on July's weather, you can visit Brussels weather in July.

August typically experiences warmer weather with temperatures ranging from a minimum of 8°C to a maximum of 36°C and an average of 19°C. It tends to be more humid at 76%, with a higher prevalence of precipitation, totaling 80 mm over 14 days. Conversely, September sees cooler temperatures, with a minimum of 4°C and a maximum of 33°C, and an average of 15°C. The month is also drier, receiving only 55 mm of rain over 9 days, and features slightly higher humidity at 82%. For more detailed information, you can visit Brussels weather in September.

In August, the weather can be quite warm, with temperatures ranging from a minimum of 8°C (46°F) to a scorching maximum of 36°C (97°F), and an average temperature of 19°C (66°F). The month experiences significant humidity at 76% and about 80 mm (3.2 in) of rainfall over 14 days. In contrast, October brings much cooler temperatures, with a minimum of 1°C (34°F), an average of 12°C (54°F), and a maximum of 25°C (77°F). Although October has slightly less precipitation at 76 mm (3.0 in) over 13 days, the humidity increases to 89%, making the air feel even more damp. For more detailed information on the October weather, you can check out Brussels weather in October.

August and November present notably different weather patterns. In August, temperatures range from a comfortable 19°C (66°F) on average, peaking at a hot 36°C (97°F), which invites outdoor activities amidst higher humidity levels at 76%. However, it also sees considerable precipitation, with rain occurring on 14 days and totaling around 80 mm (3.2 in). In contrast, November experiences much cooler temperatures, with an average of only 7°C (45°F) and nighttime lows dipping to -2°C (28°F). The month also features a higher humidity level at 92%, while precipitation is lighter at 57 mm (2.2 in) and falls on 11 days. For more detailed insights about the weather during this month, you can check Brussels weather in November.

August and December present contrasting weather patterns. August features temperatures ranging from a minimum of 8°C (46°F) to a scorching maximum of 36°C (97°F), with an average of 19°C (66°F). Though it experiences significant warmth, August is also marked by humidity levels at 76% and 80 mm (3.2 in) of precipitation spread over 14 days. In stark contrast, December's temperatures drop considerably, with a minimum of -5°C (24°F) and an average of just 5°C (42°F), peaking at 15°C (59°F). The month sees higher humidity levels at 92% and slightly more precipitation at 93 mm (3.7 in), occurring over 17 days. For more details on December weather, check out Brussels weather in December.

Compare Brussels's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in Brussels

August in Brussels uniquely blends the warmth of summer with the onset of the cooler autumn season, making it distinct within the year's climate spectrum. With peak temperatures reaching a sweltering 36°C (97°F), this month offers some of the hottest days before the gradual drop in temperature. The average sits pleasantly at 19°C (66°F), allowing for comfortable evenings after the day’s heat. However, humidity levels at 76% can create a muggy atmosphere, while 14 days of rainfall leading to a total of 80 mm of precipitation can introduce a refreshing, albeit unpredictable, twist to outdoor plans. As August transitions to September, the city’s weather becomes increasingly variable, making it essential for visitors and residents alike to prepare for both sunshine and sudden showers. For a deeper dive into Brussels' weather patterns throughout the year, check out the complete guide at Brussels Climate.