May Weather in Aalst, Belgium

Last updated: August 21, 2025

In May, Aalst, Belgium experiences a dynamic blend of weather conditions, marked by a maximum temperature reaching up to 30°C (87°F), an inviting contrast to the cooler average of 14°C (57°F). However, the month can vary significantly with a minimum temperature dropping to 1°C (34°F), creating interesting swings in daily temperatures. Rainfall is common, with precipitation amounting to 59 mm (2.3 in) over approximately 12 days, contributing to the region's characteristic humidity of 82%. This combination of warmth and moisture shapes a vibrant May, perfect for outdoor activities amid the lush spring scenery.

May Temperature in Aalst

In May, temperatures in Aalst, Belgium begin to showcase the warmth of late spring, with minimums around 1°C (34°F) and the average rising to a comfortable 14°C (57°F). As the month progresses, the maximum temperatures can soar up to 30°C (87°F), allowing residents and visitors to enjoy the outdoors and partake in various spring activities. This notable shift from the cooler April days marks a vibrant transition, laying the groundwork for the increasingly warm summer months ahead. Overall, May presents a delightful blend of crisp mornings and sunny afternoons, perfect for exploring the charming streets of Aalst.

May Weather in Aalst: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Aalst, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Aalst, May 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).
JanFebMarAprMayJunJulAugSepOctNovDec404245505765666660554642
Data source: Temperature data for Aalst 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.

May Precipitation in Aalst

In May, Aalst, Belgium experiences a moderate precipitation level of 59 mm (2.3 in), continuing the trend of relatively wet conditions observed since the start of the year. Although this month's rainfall is a slight decrease from April's 39 mm, it maintains a consistent frequency, with 12 precipitation days mirroring January and February. This consistency suggests that as spring transitions into summer, rainy days remain a fixture in the local climate. The overall pattern indicates a gradual increase in precipitation amounts up to August before the onset of the autumn rains, making May an essential month for nurturing the lush greenery that characterizes the region.

May Precipitation Trends in Aalst

The chart displays monthly precipitation patterns in Aalst, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Aalst, May typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec626569396063667352815389
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Aalst

As spring gives way to summer, May in Aalst, Belgium, experiences a notable dip in humidity, dropping to 82%. This change reflects a gradual trend of decreasing moisture levels from the start of the year, where January peaks at 91%. With each passing month, the humidity steadily lessens; April sees 85%, setting the stage for May's slight decline. Interestingly, this pattern continues into June, where humidity stabilizes at 82%, suggesting a consistent climate as warmer temperatures approach. As the seasons shift, it becomes clear that May serves as a pivotal transition point, marking the beginning of a trend towards drier conditions that characterizes the later summer months.

May Average Humidity in Aalst

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

May UV Index in Aalst

In May, the UV Index in Aalst, Belgium sees a notable increase, climbing to a high level of 7. This signifies a shift in exposure risks, as residents can expect a burn time of only 25 minutes under direct sunlight. This marks a significant transition from the moderate indices of April and the milder months preceding it, highlighting the need for more vigilant sun protection during outdoor activities. As summer approaches, the intensity continues to rise, with June bringing an even more critical very high reading of 8. It's a reminder for everyone to stay informed and take precautions as the days grow longer and sunnier. For detailed insights, check out the Aalst UV Index.

Maximum UV Index Levels in Aalst for May

The chart shows the monthly maximum UV Index (UVI) for Aalst in May, 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 May, the maximum UV index in Aalst typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Aalst May 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.

May Sunshine in Aalst

In Aalst, Belgium, May heralds the peak of sunshine, boasting an impressive 400 hours of bright blue skies, a delightful increase from the previous months. This upward trend in sunlight continues into June and July, with each month slightly surpassing its predecessor; June sees 407 hours and July reaches 415 hours. As the seasons shift towards autumn, the sunshine gradually tapers off, with August experiencing 386 hours and September dropping to 323 hours. Notably, the abundant light in May marks a significant climax in the year’s sunlit days, setting the stage for the vibrant outdoor activities that define the Belgian spring.

Monthly Sunshine Duration in Aalst: May Highlighted

The May sunshine duration represents the total number of hours Aalst experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec120h204h274h351h400h407h415h386h323h243h196h149h
Data source: Aalst May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Aalst During May

As spring unfolds in Aalst, Belgium, May offers a renewed promise of sunshine with a 33% chance of clear skies. This marks a slight dip from the previous month, April, which boasts nearly half of its days basking in sunlight at 48%. The trend suggests that while May might not deliver abundant sunny days, it still signifies a transition into warmer weather, as temperatures rise and nature flourishes. Following the cheerful burst of April, the outlook for sunny weather in May remains favorable, poised between the clear skies of spring and summer's warmth. Overall, May embodies the hope of sunshine, even as the clouds occasionally linger.

Percentage of Sunny Days in May in Aalst

The chart illustrates the percentage of sunny days in Aalst throughout the year, with May 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 Aalst experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec12%30%39%48%34%34%34%31%34%30%22%15%
Data source: Aalst May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Aalst in May

In Aalst, Belgium, daylight duration experiences a beautiful transformation throughout the year. Beginning in winter, January and February each offer a modest 8 to 10 hours of light, slowly paving the way for spring's arrival. As March brings 11 hours, the days grow longer, culminating in April with a warm 13 hours of daylight that heralds the vibrant season ahead. By May, the days extend to an invigorating 15 hours, providing ample opportunities to embrace the blooming landscapes. The sunlight peaks in June at a striking 16 hours, before gradually retreating in the following months. July retains 15 hours, while August sees a gentle decline to 14 hours. As autumn approaches, daylight tapers off to 12 hours in September, and dwindles back to 10 hours in October, before settling back to 8 hours for the winter months of November and December. This natural rhythm of long summer days and shorter winter ones fosters a dynamic backdrop for the residents of Aalst, encouraging a close connection to the changing seasons.

Average Daylight Hours in Aalst for May

The chart illustrates the variation in daylight duration in Aalst throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 29m10h 1m11h 55m13h 51m15h 32m16h 25m15h 57m14h 26m12h 34m10h 38m8h 55m8h
Data source: Aalst daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Aalst

In Aalst, Belgium, May stands out as a month of refreshing winds, with an average speed of 4.2 m/s (9 mph), mirroring January and October for its briskness. As spring unfolds, wind speeds see a notable rebound from the 3.5 m/s (8 mph) recorded in April, marking a shift towards more invigorating breezes. This trend continues through the month, creating an ideal atmosphere for outdoor activities as nature blossoms. Interestingly, the lightest winds are typically seen in June and September, emphasizing May's vibrant energy before the summer months usher in more variable conditions. Overall, May's wind is a delightful reminder of the seasonal transition, balancing the gentle warmth of spring with refreshing gusts.

Average May Wind Speed in Aalst

The chart displays monthly wind speed patterns in Aalst, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.43.93.54.2 m/s2.83.23.43.04.23.24.0
Data source: Aalst May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Aalst Compares to Other Months

Weather in Aalst varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Aalst, focusing on differences in temperature, rainfall, humidity, and UV levels.

May and January present contrasting weather patterns. In January, temperatures generally range from a chilly -6°C (21°F) to a mild 14°C (58°F), with an average of 4°C (40°F). The humidity is higher at 91%, and precipitation is slightly more at 62 mm (2.5 in) over 12 days. In contrast, May experiences a broader temperature range, from a minimum of 1°C (34°F) to a maximum of 30°C (87°F), with an average temperature of 14°C (57°F). Despite having the same number of rainy days, May’s overall precipitation is lower at 59 mm (2.3 in) and the humidity is moderate at 82%. For more details about the January weather, visit Aalst weather in January.

May and February showcase distinctly different weather patterns. In May, temperatures range from a chilly 1°C (34°F) at night to a warm 30°C (87°F) during the day, with an average of 14°C (57°F). While there's some rainfall, totaling 59 mm (2.3 in) over about 12 days, the humidity averages 82%. In contrast, February is much colder, with nighttime lows plunging to -11°C (13°F) and daytime highs reaching only 18°C (65°F), averaging around 6°C (42°F). This month sees slightly more precipitation at 65 mm (2.6 in) also over 12 days, but it comes with a higher humidity of 89%. For a detailed look at February weather, you can visit Aalst weather in February.

When comparing the weather in May and March, it's clear that May offers significantly milder temperatures. In May, the minimum temperature rarely drops below 1°C (34°F), while the average reaches 14°C (57°F), peaking at a warm 30°C (87°F). In contrast, March sees colder conditions, with minimum temperatures plummeting to -7°C (19°F) and an average of only 7°C (46°F), though it can reach a maximum of 23°C (73°F). While both months experience notable precipitation, March has slightly higher rainfall at 68 mm (2.7 in) over 14 days compared to May's 59 mm (2.3 in) over 12 days. Humidity levels are relatively high in both months, with March at 87% and May slightly lower at 82%. To explore more about March weather specifics, you can check Aalst weather in March.

In comparing the weather between April and May, we observe a notable shift in temperatures and precipitation patterns. May experiences warmer average temperatures, ranging from a minimum of 1°C to a maximum of 30°C, with an overall average of 14°C. In contrast, April's temperatures are cooler, with a minimum of -3°C and a maximum of 27°C, averaging at 10°C. Additionally, May sees slightly higher precipitation levels at 59 mm over 12 days, while April has 39 mm spread over 9 days, indicating that May is both warmer and a bit wetter. For more details on April's weather patterns, you can check Aalst weather in April.

May and June showcase a transition in weather, with June generally offering warmer temperatures. In May, the temperatures range from a chilly minimum of 1°C (34°F) to a more comfortable average of 14°C (57°F), peaking at a maximum of 30°C (87°F). The month also experiences 59 mm (2.3 in) of precipitation over 12 days, with humidity at a notable 82%. In contrast, June sees a higher minimum temperature of 8°C (46°F) and an average of 18°C (65°F), with maximums reaching 32°C (91°F). Although June has slightly more precipitation at 63 mm (2.5 in) over 9 days, the humidity remains the same at 82%. For more details on the weather patterns in June, you can visit Aalst weather in June.

In comparing the weather between May and July, it’s evident that July tends to be warmer and slightly more humid. In May, temperatures range from a chilly minimum of 1°C (34°F) to a comfortable average of 14°C (57°F) and can peak at 30°C (87°F). July, however, sees a minimum of 8°C (47°F) and an average of 19°C (66°F), with maximum temperatures soaring up to 39°C (102°F). Additionally, while both months experience precipitation, July records slightly higher rainfall at 66 mm (2.6 in) over 11 days, compared to May’s 59 mm (2.3 in) over 12 days. This slight increase in precipitation is accompanied by a marginally lower humidity level in July at 80%, compared to May’s 82%. For more specific details about July weather, you can check Aalst weather in July.

In May, temperatures in Aalst typically range from a cool 1°C (34°F) to a warm 30°C (87°F), with an average of 14°C (57°F). The month experiences approximately 59 mm (2.3 in) of precipitation over 12 days, accompanied by relatively high humidity levels of 82%. In contrast, August offers milder conditions, with minimum temperatures around 8°C (47°F) and a maximum of 35°C (96°F), averaging 19°C (66°F). Precipitation increases slightly to 73 mm (2.9 in) over 13 days, while humidity drops to 76%. For more details on weather fluctuations during this month, check out Aalst weather in August.

May and September both exhibit mild weather, yet they reveal distinct characteristics throughout the month. In May, temperatures range from a minimum of 1°C (34°F) to a pleasant average of 14°C (57°F), peaking at 30°C (87°F). This month receives around 59 mm (2.3 in) of precipitation over approximately 12 days, maintaining a high humidity level of 82%. In contrast, September experiences slightly warmer temperatures, with a minimum of 4°C (40°F) and an average of 16°C (60°F), reaching a maximum of 32°C (90°F). Precipitation in September is slightly lower at 52 mm (2.1 in), occurring across 9 days, while humidity remains consistent at 82%. Thus, while both months share a similar humidity level, September offers a warmer average and maximum temperature, making it a more appealing time for outdoor activities. For more details, check Aalst weather in September.

In May, temperatures typically range from a cool 1°C (34°F) to a warm 30°C (87°F), with an average of 14°C (57°F). The month sees about 59 mm (2.3 inches) of precipitation over approximately 12 days, accompanied by a humidity level of 82%. In contrast, October presents milder conditions, with temperatures ranging from 2°C (36°F) to a maximum of 25°C (77°F) and an average of 13°C (55°F). This month experiences slightly higher precipitation at 81 mm (3.2 inches) over 13 days, and humidity rises to 89%. For more detailed insights into October's weather, check out Aalst weather in October.

In May, temperatures range from a cool 1°C (34°F) to a warm 30°C (87°F), with an average of 14°C (57°F), making it a month of spring warmth and blooming nature. While the humidity stands at 82% and precipitation is 59 mm (2.3 in) over about 12 days, the weather is generally pleasant and inviting. In contrast, November brings much cooler temperatures, with a minimum of -2°C (29°F), an average of 8°C (46°F), and a maximum of 19°C (66°F). The humidity increases slightly to 92%, with precipitation at 53 mm (2.1 in) also spread over 12 days, indicating a shift towards the chillier, wetter months. For those interested in understanding more about the weather patterns, you can check the details here: Aalst weather in November.

May and December present contrasting weather patterns. In May, temperatures range from a chilly 1°C (34°F) at night to a warm 30°C (87°F) during the day, with an average of 14°C (57°F). The month sees a moderate amount of precipitation, totaling 59 mm (2.3 in) over approximately 12 days, and the humidity remains high at 82%. In contrast, December brings cooler conditions with temperatures dipping to a minimum of -4°C (25°F) and an average of just 6°C (43°F), peaking at 15°C (59°F). It tends to be wetter as well, with 89 mm (3.5 in) of precipitation over 16 days and an increase in humidity to 92%. For more details on December weather, check out Aalst weather in December.

Compare Aalst's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Aalst

As May unfolds in Aalst, the weather presents a delightful transition from the lingering coolness of early spring to the warmth of summer. Visitors can expect a mix of sunny days and occasional showers, with humidity levels peaking, making the air feel quite refreshing. Unlike the chillier months, May offers a significant rise in temperature, creating a vibrant atmosphere ideal for outdoor activities. While some rain is to be anticipated, the scenic beauty of blossoming landscapes makes it a charming time to visit. For a deeper look into the climate nuances throughout the year, explore Aalst Climate.