Last updated: August 21, 2025
May in Brussels, Belgium offers a vibrant mix of weather experiences. With a maximum temperature soaring up to 31°C (88°F), the days can be quite warm, while the average temperature rests at a comfortable 13°C (57°F). However, nights can get quite chilly, dropping to a minimum of 1°C (33°F). Rainfall is not uncommon, with precipitation totaling 58 mm (2.3 in) over about 12 days throughout the month, contributing to the city's lush greenery. Coupled with a high humidity level of 82%, May in Brussels is characterized by a tapestry of warm days interspersed with refreshing showers, making it a month of dynamic contrasts.
In May, Brussels experiences a delightful transition towards warmer weather, with temperatures ranging from a minimum of 1°C (33°F) to a balmy 31°C (88°F) at the top end. This month showcases an average temperature of 13°C (57°F), marking a significant rise compared to the cooler months of early spring. As the city shakes off the chill of winter, residents and visitors alike are greeted by longer daylight hours and a vibrant atmosphere, perfect for exploring its beautiful parks and historic streets. The sharp increase in maximum temperatures signals a shift towards summer, making May an ideal time to enjoy outdoor festivities and the blooming charm of Brussels.
In May, Brussels experiences a moderate level of precipitation, with 58 mm (approximately 2.3 inches) falling over 12 days. This month reflects a slight increase from the notably dry April, which recorded only 37 mm. As spring transitions to summer, May sees a refreshing rise in rainfall compared to earlier months, though it remains lower than the rainy peaks of July and August. The balanced precipitation contributes to the lush greenery of the city, while the consistent rain days ensure that may flowers are in full bloom, enriching the picturesque urban landscape. Overall, May serves as a bridge, hinting at the wetter conditions ahead while still allowing for ample sunshine and pleasant days.
As spring transitions into summer, May in Brussels, Belgium, boasts a delightful drop in humidity to 82%, marking a notable change from the damp chill of winter months. This reduction reflects a steady trend observed since January, where humidity peaks at 91%, gradually declining each month. By May, the air feels more refreshing, enhancing outdoor experiences and inviting locals and tourists alike to explore the blossoming cityscape. Interestingly, this level of humidity remains constant into June, suggesting that the pleasant, slightly crisp atmosphere is characteristic of early summer in Brussels, before the heat of July and August.
As spring unfolds in Brussels, May marks a significant shift in UV Index levels, soaring to a high rating of 7, where sun exposure becomes more critical with a burn time of just 25 minutes. This trend is a notable departure from the preceding months, where the UV Index remained comfortably low to moderate, fluctuating between 1 and 5. As the days grow longer and sunnier, it’s essential to stay vigilant about sun protection, as the high levels may lead to quicker skin damage. Following May, the UV Index peaks again in June and July, emphasizing the need for awareness during these months. For those planning outdoor activities, it’s best to stay informed and prepared. For more details, check out the Brussels UV Index.
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In May, Brussels basks in a delightful 394 hours of sunshine, marking a beautiful transition into the warmer months. This peak in daylight hours follows a steady climb from January's modest 121 hours, reflecting a gradual awakening of spring. The city's sunny disposition continues to gather momentum through June and July, where it reaches its zenith with 398 and 406 hours respectively. Notably, this robust increase in sunlight correlates with the city's vibrant outdoor culture, beckoning locals and tourists alike to revel in the festivities. As summer wanes into August and September, the decline in sunshine is gentle yet palpable, hinting at the seasonal shift, yet May remains a standout month, celebrated for its abundant brightness and the picturesque charm it brings to the heart of Belgium.
As spring unfolds in Brussels, the likelihood of enjoying sunny weather reaches a peak in April at 50%, only to dip slightly to 33% by May, maintaining the trend of fluctuating sunshine. This notable decrease marks a transition as the warm days of summer approach, with June through August hovering around the same sunny probability. Interestingly, despite the shift in seasonal warmth, May's sunshine percentage remains robust compared to the chilly winter months, highlighting a trend toward more frequent sunny spells. While May brings the promise of blooming flowers and longer days, the variable weather still leaves room for some cloud cover, making each sunny day a cherished moment in Brussels.
As spring unfolds into summer, May heralds a delightful increase in daylight hours in Brussels, with an impressive 15 hours of sunlight. This month marks a notable transition, building on April's 13 hours and setting the stage for even longer days ahead in June. The trend shows a clear shift towards brighter days, encouraging residents and visitors alike to bask in the outdoor beauty of the city. This gradual elongation of daylight not only brightens the landscape but also invigorates the community, inviting everyone to savor the season's vibrant potential before the daylight begins its slow retreat in the latter months of the year.
In May, Brussels experiences a refreshing revival of breezy conditions with an average wind speed of 4.4 m/s (10 mph), mirroring the brisk winds of January and October. This resurgence comes after the calmer days of April, where the winds dipped to their lowest at 3.4 m/s (8 mph). As spring blossoms, the consistent wind speeds in May not only invigorate the city's atmosphere but also signal a delightful transition towards the warmer months ahead. This newfound breeze complements the lush greenery emerging in local parks, making it a perfect time for residents and visitors to embrace the outdoors.
Weather in Brussels varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Brussels, focusing on differences in temperature, rainfall, humidity, and UV levels.
In May, temperatures typically range from a minimum of 1°C (33°F) to a maximum of 31°C (88°F), resulting in a pleasant average of 13°C (57°F). The humidity level is relatively high at 82%, and with 58 mm (2.3 in) of precipitation spread over about 12 days, May generally feels more vibrant and lively. In contrast, January experiences much colder temperatures, with lows plummeting to -7°C (20°F) and an average of only 4°C (39°F), peaking at 14°C (57°F). The month sees slightly more precipitation at 65 mm (2.5 in) also over 12 days, while the humidity remains higher at 91%. For more details on conditions, visit Brussels weather in January.
When comparing the weather in May and February, notable differences emerge in temperature and overall climate. May typically enjoys a broader temperature range, with minimums around 1°C (33°F) and maximums reaching up to 31°C (88°F), resulting in an average of 13°C (57°F). In contrast, February experiences much colder temperatures, with lows dipping to -8°C (17°F) and highs only reaching 19°C (66°F), averaging just 5°C (42°F). Additionally, while May has a lower precipitation level of 58 mm (2.3 in) over 12 days, February sees slightly more rainfall at 69 mm (2.7 in), also spread over 12 days. Interestingly, February has a higher humidity level at 89%, compared to May’s 82%. For more detailed information on February weather, you can visit Brussels weather in February.
May and March present contrasting weather patterns. In May, temperatures range from a chilly 1°C (33°F) at night to a warm 31°C (88°F) during the day, with an average of 13°C (57°F). This month sees around 58 mm (2.3 in) of precipitation over approximately 12 days, while humidity sits at 82%. In contrast, March experiences colder conditions, with nighttime lows plunging to -8°C (17°F) and daytime highs reaching up to 23°C (74°F), averaging 7°C (45°F). Although March has slightly higher precipitation at 70 mm (2.8 in) over about 14 days, the humidity is marginally higher at 87%. For more details about March weather, you can visit Brussels weather in March.
In comparing the weather between April and May, we see a significant shift in temperatures and conditions. May experiences higher temperatures, ranging from a minimum of 1°C (33°F) to a maximum of 31°C (88°F), with an average temperature of 13°C (57°F). In contrast, April's temperatures are cooler, with a minimum of -4°C (26°F) and a maximum of 27°C (80°F), averaging around 10°C (50°F).
Additionally, May sees more precipitation at 58 mm (2.3 in) over 12 days, compared to April's 37 mm (1.5 in) over 8 days. Interestingly, the humidity levels are quite similar, with April at 85% and May slightly lower at 82%. For more details on April weather specifically, you can check Brussels weather in April.
In May, temperatures in Brussels range from a chilly 1°C (33°F) at night to a warm 31°C (88°F) during the day, with an average of 13°C (57°F). The month sees about 58 mm (2.3 in) of precipitation over 12 days, maintaining a consistently high humidity of 82%. In contrast, June brings milder nights with a minimum temperature of 7°C (44°F) and a daytime high of 32°C (91°F), resulting in an average of 18°C (65°F). While June has a slightly higher total precipitation of 66 mm (2.6 in), it occurs over just 9 days, keeping humidity at the same level of 82%. For more information on the weather in June, check out Brussels weather in June.
May and July present contrasting weather patterns, reflecting the transition from spring to summer. In May, temperatures range from a cool 1°C (33°F) at night to a warm 31°C (88°F) during the day, with an average of 13°C (57°F). The month experiences about 58 mm (2.3 in) of precipitation over 12 days, accompanied by high humidity levels at 82%. In comparison, July is generally warmer, with minimum temperatures starting at 8°C (46°F) and reaching a scorching 39°C (102°F), averaging 19°C (66°F). While it sees slightly higher rainfall at 71 mm (2.8 in) over 11 days, humidity remains relatively stable at 80%. For a detailed look at July's weather, you can check Brussels weather in July.
Compared to May, August features significantly warmer temperatures, with a minimum of 8°C (46°F) and an average of 19°C (66°F), while May starts with a chillier minimum of 1°C (33°F) and an average of 13°C (57°F). August can reach maximum temperatures of 36°C (97°F), offering a stark contrast to May's warmer days, which peak at 31°C (88°F). Precipitation is slightly higher in August, with 80 mm (3.2 in) over 14 days compared to May's 58 mm (2.3 in) over 12 days, though the humidity is a bit lower in August at 76% compared to May's 82%. For more information about August's weather, visit Brussels weather in August.
When comparing the weather in May and September, both months showcase mild temperatures, although September tends to be slightly warmer on average. In May, temperatures range from a minimum of 1°C to a maximum of 31°C, while September sees a minimum of 4°C and a maximum of 33°C. Precipitation levels are quite similar, with May receiving 58 mm across 12 days and September having 55 mm over just 9 days. Both months maintain a consistent humidity level of 82%. For more details on September weather, you can check out this link: Brussels weather in September.
May and October present contrasting weather experiences. In May, temperatures range from a chilly 1°C (33°F) to a warm 31°C (88°F), with an average of 13°C (57°F). The month sees around 58 mm (2.3 in) of rainfall over approximately 12 days, accompanied by relatively high humidity at 82%. On the other hand, October features a cooler temperature spectrum, with a minimum of 1°C (34°F) and a maximum of 25°C (77°F), averaging slightly lower at 12°C (54°F). Rainfall increases to 76 mm (3.0 in) over about 13 days, and humidity rises to 89%. For more details on October weather, you can visit Brussels weather in October.
In May, the weather shows a wide range of temperatures, with minimums around 1°C (33°F) and maximums reaching up to 31°C (88°F), resulting in a pleasant average of 13°C (57°F). The month experiences about 58 mm (2.3 in) of precipitation over approximately 12 days, with humidity levels hovering at 82%. In contrast, November presents a cooler climate, characterized by minimum temperatures dipping to -2°C (28°F) and maximums capping at 18°C (65°F), averaging around 7°C (45°F). Precipitation remains similar at 57 mm (2.2 in), falling over roughly 11 days, but with a higher humidity level of 92%. For more detailed information, visit Brussels weather in November.
May and December present quite contrasting weather patterns. In May, temperatures range from a refreshing 1°C (33°F) to a warm 31°C (88°F), with an average of 13°C (57°F), making it a pleasant month as spring blossoms. However, December brings cooler temperatures, with lows plummeting to -5°C (24°F) and highs only reaching up to 15°C (59°F), averaging around 5°C (42°F). Additionally, May experiences 58 mm (2.3 in) of precipitation over 12 days, while December sees more substantial rainfall at 93 mm (3.7 in) over 17 days. The humidity is slightly higher in December at 92%, compared to 82% in May. For more details on the chillier month, check out Brussels weather in December.
As spring transitions to summer, May in Brussels brings a delightful blend of warmer temperatures and increased humidity, setting it apart from the cooler months of the year. With the average temperature climbing significantly, visitors can experience the city's vibrant outdoor life, despite occasional rain that graces the region about 12 days throughout the month. The 82% humidity can make the warmer days feel a bit muggy, but it's a refreshing change from the colder, drier months. For a detailed overview of what to expect throughout the year, check out Brussels Climate.