May Weather in Waterloo, Belgium

Last updated: August 21, 2025

Experience the dynamic weather of Waterloo, Belgium in May, where temperatures can soar to a maximum of 31°C (87°F) and dip to a refreshing minimum of 0°C (33°F), averaging around 13°C (57°F). This month is characterized by a mix of sunshine and rain, with 60 mm (2.4 in) of precipitation recorded over 13 days, leading to a humidity level of 82% that adds a touch of moisture to the spring air. Whether you’re enjoying the sunny spells or navigating the rainy days, May in Waterloo offers a unique blend of weather to suit all preferences.

May Temperature in Waterloo

In May, Waterloo, Belgium, experiences a delightful transition into warmer weather, showcasing temperatures that embrace both freshness and warmth. The month starts with minimums around 0°C (33°F), gradually rising to an impressive maximum of 31°C (87°F). This range highlights a significant leap from the chill of earlier months, reflecting an upward trend as spring unfolds into early summer. On average, temperatures rest comfortably at 13°C (57°F), making May an ideal time for outdoor activities and appreciating the blooming landscapes. As daylight hours increase and nature flourishes, residents and visitors alike relish in the pleasant warmth that marks this vibrant month in Waterloo.

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

The chart illustrates May temperature patterns in Waterloo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Waterloo, 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).
JanFebMarAprMayJunJulAugSepOctNovDec394145505664666660544542
Data source: Temperature data for Waterloo 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 Waterloo

In May, Waterloo, Belgium experiences a moderate amount of precipitation, with 60 mm (2.4 in) falling over approximately 13 days. This marks a slight uptick from April’s relatively dry spell of 36 mm (1.4 in) across 8 days, indicating a shift towards wetter conditions as spring progresses into early summer. The pattern aligns with a general trend of increasing precipitation leading into the warmer months, reflected in June's higher average of 72 mm (2.8 in) despite having fewer rainy days. This indicates that while May brings its fair share of rain, it also sets the stage for the more substantial rainfall that characterizes the upcoming summer.

May Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, 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 Waterloo, May typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec657071376072748458785892
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Waterloo

In Waterloo, Belgium, the month of May marks a notable shift in humidity levels, dropping to 82%. This decrease follows a gradual decline from the winter months, where humidity begins at a high of 91% in January and steadily decreases to 85% by April. As spring unfolds, May maintains the same level of humidity as June, suggesting a consistent climatic pattern during early summertime. Following this, the humidity further decreases to 80% in July and a more comfortable 76% in August, indicating a trend towards drier conditions. This improving trend in humidity enhances the appeal of May as a pleasant time for outdoor activities, making it a delightful month to explore the charming landscapes of Waterloo.

May Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, 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 Waterloo 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 Waterloo

As May arrives in Waterloo, Belgium, the UV Index sees a noticeable rise, reaching 7, which falls into the high exposure category. This increase indicates a shift from the moderate levels of previous months, such as April’s 5 and March’s 4, prompting residents and visitors alike to take more precautions while enjoying the outdoors. With a burn time of just 25 minutes, it's essential to ensure adequate sun protection, especially as the sun's intensity grows. This trend continues into June and July with even higher indices, making May a perfect time to enjoy the blossoming scenery while being mindful of UV exposure. For more detailed information, visit Waterloo UV Index.

Maximum UV Index Levels in Waterloo for May

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

In Waterloo, Belgium, the arrival of May brings a delightful peak in sunshine, with 394 hours of glorious daylight illuminating the landscape. This marks a significant increase from the 346 hours enjoyed in April, showcasing a vibrant transition into spring. As daylight continues to blossom, June follows closely behind with a mere 4-hour increase, suggesting that the region thrives under the warm embrace of the sun during these months. The sun-soaked days contrast sharply with the darker winter months, where January offers just 121 hours of light, gradually climbing to a modest 200 hours in February. Observing these trends, it's clear that the longer days of late spring and early summer not only enhance outdoor activities but also invigorate the community, celebrating the beauty of brighter days ahead.

Monthly Sunshine Duration in Waterloo: May Highlighted

The May sunshine duration represents the total number of hours Waterloo 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.
JanFebMarAprMayJunJulAugSepOctNovDec121h200h266h346h394h398h406h379h319h240h190h143h
Data source: Waterloo May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Waterloo During May

As spring unfolds into May, the likelihood of sunny weather in Waterloo, Belgium, sees a modest decrease, with chances of sunshine resting at 33%. This marks a notable dip from the higher probabilities experienced in April, where sunny days reached nearly 50%. While May shares the same statistical chance as the following summer months—June and July—it reflects a transitional period as the landscape shifts from the vibrant blooms of spring to the lush warmth of summer. The fluctuations in sunny weather from January to May illustrate a gradual increase as the year progresses, although May holds its own unique charm with a blend of occasional sunshine and refreshing spring showers.

Percentage of Sunny Days in May in Waterloo

The chart illustrates the percentage of sunny days in Waterloo 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 Waterloo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec10%31%39%49%33%33%33%29%36%31%24%16%
Data source: Waterloo May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Waterloo in May

As spring fully blossoms into summer in Waterloo, Belgium, the daylight duration experiences a significant shift, showcasing a pattern of gradual increase. Starting with 8 hours in January, residents see this number rise steadily, hitting 10 hours by February and reaching 11 hours in March. April ushers in a more pronounced change with 13 hours of daylight, setting the stage for May's generous 15 hours. This upward trend peaks in June, offering an impressive 16 hours of sunshine—a perfect time for outdoor activities. However, as summer wanes, the daylight begins to recede, descending back to 15 hours in July and then to 14 hours in August. By the time September rolls around, daylight diminishes to 12 hours, and the cycle gently closes as October brings 10 hours, echoing the earlier months of the year. Ultimately, this rhythmic ebb and flow of daylight not only marks the changing seasons but also enriches the vibrant life and activities in Waterloo.

Average Daylight Hours in Waterloo for May

The chart illustrates the variation in daylight duration in Waterloo throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 30m10h 2m11h 55m13h 50m15h 31m16h 23m15h 55m14h 25m12h 34m10h 39m8h 56m8h 1m
Data source: Waterloo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Waterloo

In May, Waterloo, Belgium experiences a refreshing revival in wind activity, with average speeds reaching 4.4 m/s (10 mph), matching the gusts of both January and October. This invigorating breeze contrasts sharply with the calmer winds of April, which dipped to 3.4 m/s (8 mph). As spring unfolds, May's winds provide a delightful backdrop for outdoor activities, reminiscent of the robust breezes felt earlier in the year. However, the month also marks a turning point, as the following months tend to experience a gradual decline in wind speeds, with June dropping to a gentle 2.8 m/s (6 mph). Thus, May stands out as a transitional period, where the brisk winds of winter begin to wane, paving the way for the stillness of summer.

Average May Wind Speed in Waterloo

The chart displays monthly wind speed patterns in Waterloo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.64.13.44.4 m/s2.83.43.43.04.43.44.2
Data source: Waterloo May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Waterloo Compares to Other Months

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

May and January present contrasting weather conditions. In May, temperatures range from a minimum of 0°C (33°F) to a maximum of 31°C (87°F), with an average of 13°C (57°F). The month typically experiences 60 mm (2.4 in) of precipitation over approximately 13 days, and humidity levels hover around 82%. In contrast, January is much colder, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 14°C (57°F), resulting in an average of only 4°C (39°F). This month receives slightly more precipitation at 65 mm (2.6 in) over about 12 days, accompanied by higher humidity at 91%. For more detailed information about January weather, you can visit Waterloo weather in January.

When comparing the weather in May and February, there are notable differences in temperature and overall climate conditions. May boasts a wider temperature range, with minimums around 0°C (33°F) and maximums reaching 31°C (87°F), resulting in an average of 13°C (57°F). In contrast, February temperatures are much lower, with minima of -9°C (17°F) and a maximum of 19°C (66°F), averaging only 5°C (42°F).

Precipitation levels are somewhat similar, with May receiving 60 mm (2.4 in) over 13 days and February slightly higher at 70 mm (2.7 in) across 12 days. Humidity is greater in February at 89% compared to May's 82%, contributing to a chillier feeling as spring approaches. For more details on February weather, you can refer to Waterloo weather in February.

When comparing the weather in May and March, it's evident that May generally brings warmer temperatures and a more pleasant climate. In May, temperatures vary from a minimum of 0°C (33°F) to a maximum of 31°C (87°F), averaging around 13°C (57°F), while March experiences much cooler conditions, with a range from -9°C (17°F) to 23°C (74°F) and an average of 7°C (45°F). Despite May having slightly less precipitation at 60 mm (2.4 in) compared to March's 71 mm (2.8 in), both months see a similar number of rainy days, with May at 13 days and March at 14 days. Additionally, humidity levels are slightly lower in May at 82%, compared to the higher 87% in March. For more detailed information, check out Waterloo weather in March.

In comparing the weather of May and April, May generally experiences warmer temperatures, with a minimum of 0°C (33°F), an average of 13°C (57°F), and a maximum of 31°C (87°F), whereas April's temperatures range from a minimum of -4°C (26°F) to a maximum of 27°C (81°F). Additionally, May sees increased precipitation at 60 mm (2.4 in) over 13 days, compared to April's 36 mm (1.4 in) over 8 days. Humidity levels remain relatively high in both months, with May at 82% and April slightly higher at 85%. For more details on the specific conditions in April, you can visit Waterloo weather in April.

In May, temperatures in Waterloo range from a chilly 0°C (33°F) at night to a warm 31°C (87°F) during the day, averaging around 13°C (57°F). The month sees about 60 mm (2.4 in) of precipitation over 13 days, with humidity levels hovering at 82%. In contrast, June brings slightly warmer temperatures, with minimums of 7°C (45°F) and maximums reaching 33°C (91°F), resulting in an average temperature of 18°C (65°F). Precipitation increases to 72 mm (2.8 in) over just 11 days, while humidity remains consistent at 82%. For a more detailed look at June weather in Waterloo, check out Waterloo weather in June.

When comparing the weather in May and July, there are notable differences in temperature and precipitation. May experiences a wider range of temperatures, with a minimum of 0°C (33°F) and a maximum reaching up to 31°C (87°F), averaging around 13°C (57°F). In contrast, July has milder minimum temperatures at 8°C (46°F), with an average of 19°C (66°F) and a maximum soaring to 39°C (102°F). While May receives about 60 mm (2.4 in) of precipitation over 13 days, July sees slightly higher rainfall totals at 74 mm (2.9 in) across 11 days, with humidity levels remaining fairly consistent at around 82% in May and 80% in July. For more insights on the weather specifics, you can check Waterloo weather in July.

May and August present quite a contrast in weather patterns. In May, temperatures range from a chilly 0°C (33°F) at night to a warm 31°C (87°F) during the day, with an average of 13°C (57°F). The month sees around 60 mm (2.4 in) of precipitation spread over 13 days, coupled with high humidity at 82%. In comparison, August enjoys milder temperatures with a minimum of 7°C (46°F) and a maximum of 36°C (97°F), while the average temperature rises to 19°C (66°F). Precipitation increases slightly to 84 mm (3.3 in) over 14 days, and humidity decreases to 76%. For more detailed information on summer weather, check out Waterloo weather in August.

In May, temperatures can range from a chilly 0°C (33°F) to a warm 31°C (87°F), with an average of 13°C (57°F). The month typically experiences about 60 mm (2.4 in) of precipitation over 13 days, and maintains a high humidity level of 82%.

In contrast, September sees a slightly warmer minimum temperature of 4°C (39°F) and an average of 15°C (60°F), with a maximum reaching 33°C (91°F). Precipitation levels are a bit lower at 58 mm (2.3 in) over approximately 10 days, while humidity remains the same at 82%.

For a more detailed look at the weather patterns in September, you can check out Waterloo weather in September.

May and October exhibit distinct differences in weather patterns, reflecting the transition from spring to autumn. In May, temperatures range from a minimum of 0°C (33°F) to a maximum of 31°C (87°F), with an average of 13°C (57°F). The month experiences relatively low precipitation at 60 mm (2.4 in) over 13 days, coupled with 82% humidity. In contrast, October sees slightly cooler temperatures, with a minimum of 1°C (35°F), an average of 12°C (54°F), and a maximum of 25°C (77°F). Rainfall increases to 78 mm (3.1 in) also over 13 days, and humidity rises to 89%. For more detailed information, you can check Waterloo weather in October.

In May, temperatures range from a chilly 0°C (33°F) at their lowest to a warm 31°C (87°F) at their peak, with an average temperature of 13°C (57°F). The month experiences approximately 60 mm (2.4 in) of rainfall over 13 days, and humidity levels are relatively high at 82%. In contrast, November sees cooler temperatures, with a minimum of -3°C (28°F) and a maximum of 18°C (65°F), resulting in an average of 7°C (45°F). Precipitation slightly decreases to 57 mm (2.3 in) over 11 days, but humidity rises to 92%, making the air feel more damp. For more detailed information, check out Waterloo weather in November.

May and December showcase contrasting weather patterns. In May, temperatures range from a chilly 0°C (33°F) at night to a warm 31°C (87°F) during the day, with an average of 13°C (57°F). The month sees about 60 mm (2.4 in) of precipitation over 13 days, and humidity hovers around 82%. Conversely, December presents cooler conditions, with temperatures dipping as low as -4°C (24°F) and peaking at 15°C (59°F), averaging at a brisk 5°C (42°F). This month experiences more rainfall, totaling 92 mm (3.6 in) across 17 days, along with higher humidity levels at 92%. For more detailed information, visit Waterloo weather in December.

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Conclusion: What to Expect From May Weather in Waterloo

May in Waterloo marks a distinct transition as temperatures begin to rise, offering a reprieve from the cooler months of spring. With an average of 13°C, it contrasts sharply with the colder winter and early spring temperatures, allowing residents and visitors to fully enjoy the blossoming nature. While the maximum can soar to 31°C, the month also experiences a fair share of rain, averaging 60 mm over 13 days. Coupled with elevated humidity levels of 82%, it creates a lush atmosphere that greatly differs from the dry, colder months preceding it. To learn more about how May fits into the annual cycle of Waterloo's weather, visit Waterloo Climate.