September Weather in Mechelen, Belgium

Last updated: August 21, 2025

September in Mechelen, Belgium offers a delightful blend of mild temperatures and occasional rainfall. The month experiences a maximum temperature soaring up to 33°C (93°F), while averaging around a comfortable 16°C (60°F), and dipping to a refreshing 4°C (39°F) at night. With 50 mm (2.0 in) of precipitation spread across 9 rainy days, the humidity hovers at a notable 82%, creating a refreshing atmosphere. Whether you're exploring the city's charming streets or enjoying the lush surroundings, September serves as a perfect time to experience Mechelen's transitional beauty from summer to autumn.

September Temperature in Mechelen

In September, the weather in Mechelen, Belgium, reflects a beautiful transition from summer to autumn. With daily temperatures ranging from a minimum of 4°C (39°F) to a maximum of 33°C (93°F), the month showcases a pleasant average of 16°C (60°F). This indicates a gradual cooling trend compared to the sweltering peak summer months of July and August, which frequently saw maximums nearing 39°C (103°F). As September unfolds, the refreshing air invites outdoor explorations and the shifting foliage hints at the beauty of the upcoming fall. Overall, the temperatures in September provide a comfortable backdrop for both locals and visitors to enjoy the charming landscapes of Mechelen.

September Weather in Mechelen: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mechelen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mechelen, September 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).
JanFebMarAprMayJunJulAugSepOctNovDec404245505765666660554542
Data source: Temperature data for Mechelen 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.

September Precipitation in Mechelen

In September, Mechelen experiences a notable shift in precipitation patterns, receiving an average of 50 mm (2.0 in) of rain over 9 days. This marks a decrease compared to the heavier showers of the preceding months, particularly August, which boasted 74 mm (2.9 in) of rain across 13 rainy days. As summer transitions to autumn, September’s cooler temperatures and reduced rainfall signal a gradual shift in the region’s climate. Interestingly, while the month remains relatively damp, it sets the stage for the much wetter October, which typically brings about 77 mm (3.0 in), highlighting a seasonal trend of increasing precipitation as the year progresses toward winter.

September Precipitation Trends in Mechelen

The chart displays monthly precipitation patterns in Mechelen, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Mechelen, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec626768355764717450775388
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mechelen

In Mechelen, Belgium, September marks a slight uptick in humidity, returning to 82% after the drier summer months. Following a gradual decline from 91% in January to a low of 76% in August, September's humidity levels suggest a transitional phase as the city braces for the cooler autumn months. This increase serves as a reminder of the region's characteristic maritime climate, with typical late-summer warmth giving way to the more humid conditions of fall. As the year progresses, humidity will continue to rise through October, indicating a return to the higher moisture levels typical of late autumn and winter.

September Average Humidity in Mechelen

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

September UV Index in Mechelen

In September, Mechelen, Belgium, experiences a moderate UV Index of 5, which reduces the burn time to approximately 30 minutes. This signals a shift from the peak summer months, where the UV Index reached a striking 8 in both June and July, indicating very high exposure. As we transition into autumn, the UV intensity declines, down to 7 in August, suggesting it's the perfect time to enjoy outdoor activities while staying mindful of sun safety. For those venturing out, a moderate exposure category still calls for caution, reminding us that even in fall, UV rays can pose a risk. For more detailed information, visit Mechelen UV Index.

Maximum UV Index Levels in Mechelen for September

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

September Sunshine in Mechelen

As summer transitions into autumn, September in Mechelen, Belgium offers a delightful balance of warmth and light, basking in 320 hours of sunshine. This marks a slight decline from the peak of 411 hours in July, yet it still reflects a robust continuation of bright days. With the sunlight gradually receding from a vibrant 397 hours in May to more tempered October days, September stands as a golden bridge, where lingering warmth invites outdoor activities while the crispness of fall begins to creep in. This month not only showcases a noteworthy abundance of sunshine compared to the darker months ahead, but also serves as a gentle reminder of summer’s lingering embrace before embracing autumn's charm.

Monthly Sunshine Duration in Mechelen: September Highlighted

The September sunshine duration represents the total number of hours Mechelen experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec120h203h272h348h397h400h411h383h320h241h191h143h
Data source: Mechelen September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mechelen During September

In Mechelen, Belgium, the chance of experiencing sunny weather in September is moderately promising, standing at 34%. This figure is consistent with the summer months, where July and August also share the same likelihood of sunshine. As autumn approaches, September remains one of the more favorable months for sunshine, especially when compared to the darker winter months that follow. Notably, the trend shows a gradual decline in sunny days as the year progresses, peaking in April (47%) before tapering off. Thus, while September may not guarantee endless sunshine, it offers a solid opportunity to enjoy pleasant weather before the chill of October sets in.

Percentage of Sunny Days in September in Mechelen

The chart illustrates the percentage of sunny days in Mechelen throughout the year, with September 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 Mechelen experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec11%31%39%47%33%34%34%31%34%31%24%17%
Data source: Mechelen September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mechelen in September

As September rolls into Mechelen, Belgium, daylight begins to wane, reflecting the seasonal transition toward autumn. This month offers around 12 hours of daylight, marking a notable decrease from the 16 hours enjoyed in June and 15 hours in July. The gradual shift from summer to fall is evident as daylight hours decrease steadily from the vibrant 15 hours in May to a more subdued 12 hours. Despite this reduction, September still provides a pleasant balance of light, allowing residents to savor the lingering warmth of summer before the shorter days of October settle in, with only 10 hours of daylight expected. This rhythm of changing daylight embodies the charm of Mechelen’s seasons, inviting both reflection and the appreciation of nature's cycle.

Average Daylight Hours in Mechelen for September

The chart illustrates the variation in daylight duration in Mechelen throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 27m10h11h 55m13h 52m15h 34m16h 27m15h 59m14h 27m12h 34m10h 38m8h 53m7h 58m
Data source: Mechelen daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Mechelen

As September rolls into Mechelen, Belgium, the breezes begin to lighten, with an average wind speed of just 2.9 m/s (6 mph). This gentle shift signals a transition from the summer's warmer gusts to the more tranquil autumn air. Compared to earlier months, such as May and June, where the winds were notably stronger, September's calming zephyrs invite leisurely strolls through the city's picturesque streets. Interestingly, September's wind speed is the lowest of the year, hinting at the approach of the quieter months ahead. As the winds ease, the atmosphere becomes ripe for reflection and appreciation of Mechelen's enchanting charm, perfectly matched with the changing foliage of the season.

Average September Wind Speed in Mechelen

The chart displays monthly wind speed patterns in Mechelen, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.33.83.34.12.73.23.22.9 m/s4.13.23.9
Data source: Mechelen September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Mechelen Compares to Other Months

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

September and January present striking contrasts in weather. September enjoys a milder climate, with average temperatures ranging from a low of 4°C (39°F) to a high of 33°C (93°F), alongside relatively lower humidity at 82%. In this month, total precipitation is about 50 mm (2.0 in), typically occurring over 9 days. In stark contrast, January’s chilly weather hovers around an average of 4°C (40°F), with temperatures dipping to a minimum of -6°C (21°F) and peaking at 14°C (58°F). This month also sees a higher overall humidity of 91%, with increased rainfall—62 mm (2.4 in) spread over 11 days. For more details on January weather specifics, check out Mechelen weather in January.

September and February present strikingly different weather patterns. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 33°C (93°F), with an average of 16°C (60°F). This month typically experiences about 50 mm (2.0 in) of precipitation over 9 days and maintains a humidity level of 82%. In contrast, February is much cooler, with temperatures dipping as low as -9°C (16°F) and peaking at 19°C (66°F), averaging around 6°C (42°F). February sees slightly higher precipitation at 67 mm (2.6 in) over 12 days, accompanied by an increased humidity level of 89%. For more detailed insights, you can check Mechelen weather in February.

When comparing the weather in September and March, notable differences emerge in temperature and precipitation. September offers a warmer climate, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 33°C (93°F), while March is significantly cooler, with temperatures ranging from -7°C (19°F) to 23°C (74°F). Humidity levels are relatively high in both months, with September at 82% and March slightly higher at 87%. Additionally, March experiences more rainfall, accumulating 68 mm (2.7 in) over 13 days, compared to September's 50 mm (2.0 in) over 9 days. For more details on the specific weather conditions in March, visit Mechelen weather in March.

September and April present contrasting weather characteristics. In September, the temperatures range from a minimum of 4°C (39°F) to a maximum of 33°C (93°F), with an average of 16°C (60°F). This month sees approximately 50 mm (2.0 in) of precipitation across nine days, with humidity levels relatively high at 82%. On the other hand, April experiences cooler temperatures, with a minimum of -4°C (26°F) and a maximum of 28°C (82°F), averaging around 10°C (51°F). It also features lesser precipitation, about 35 mm (1.4 in) over seven days and slightly higher humidity at 85%. For more detailed weather insights, check out Mechelen weather in April.

When comparing the weather in September and May, both months exhibit mild to warm conditions, but with distinct differences. In September, the average temperature reaches 16°C (60°F), peaking at 33°C (93°F), while May’s average temperature is slightly lower at 14°C (57°F), with a maximum of 32°C (89°F). Interestingly, September sees a minimum temperature of 4°C (39°F), compared to May’s cooler minimum of 1°C (34°F). Precipitation levels are relatively similar, with September averaging 50 mm (2.0 in) over 9 days and May slightly higher at 57 mm (2.3 in) over 12 days. Humidity remains constant in both months at 82%, contributing to an overall pleasant yet occasionally damp atmosphere. For more detailed information, you can explore Mechelen weather in May.

In comparing the weather between September and June, both months display a maximum temperature of 33°C (92°F), indicating similar peak warmth during late spring and early fall. However, September tends to be cooler overall, with an average temperature of 16°C (60°F) compared to June's average of 18°C (65°F). Rainfall is slightly higher in June, with 64 mm (2.5 in) of precipitation over 9 days, while September sees 50 mm (2.0 in) over the same number of days. Interestingly, humidity levels remain consistent throughout both months at 82%, contributing to the overall muggy feel. For more insights on June weather specifically, you can explore Mechelen weather in June.

In comparing the weather of September and July, notable differences emerge. September experiences a broader temperature range, with minimums of 4°C (39°F) and maximums reaching 33°C (93°F), averaging around 16°C (60°F). In contrast, July maintains a warmer profile, with minimums at 8°C (47°F) and maximums soaring up to 39°C (103°F), averaging 19°C (67°F). While September records about 50 mm (2.0 in) of precipitation over 9 days, July has slightly higher precipitation levels at 71 mm (2.8 in) across 10 days, albeit with similar humidity levels of around 80-82%. For more detailed information on July weather in Mechelen, visit Mechelen weather in July.

In comparing the weather of September and August, September experiences cooler temperatures, with a minimum of 4°C (39°F) and an average of 16°C (60°F), contrasting with August's slightly warmer temperatures, which range from a minimum of 8°C (47°F) to an average of 19°C (67°F). August also boasts higher maximum temperatures, reaching up to 36°C (96°F), while September's highest is 33°C (93°F). In terms of precipitation, August is wetter, receiving 74 mm (2.9 in) over 13 days compared to September's 50 mm (2.0 in) over 9 days. Additionally, September exhibits higher humidity levels at 82%, compared to August's 76%. For a detailed look at August weather, check out Mechelen weather in August.

September weather in Mechelen showcases a wide range of temperatures, with lows around 4°C (39°F) and highs reaching up to 33°C (93°F), averaging 16°C (60°F). The month experiences about 50 mm (2.0 in) of precipitation over nine days, and the humidity sits at a relatively comfortable 82%. In contrast, October brings cooler temperatures, with minimums dropping to 2°C (35°F) and maximums capping at 26°C (79°F), resulting in an average of 13°C (55°F). This month is slightly wetter, accumulating 77 mm (3.0 in) of rain over 12 days and a notable increase in humidity at 89%. For more details, you can check Mechelen weather in October.

September and November present contrasting weather patterns. September typically boasts warmer temperatures, with averages around 16°C (60°F) and highs reaching up to 33°C (93°F), while November cools down significantly, featuring average highs of just 7°C (46°F) and even dipping to a minimum of -3°C (28°F). Although both months experience precipitation, November records slightly more, with 53 mm (2.1 in) over 10 days compared to September’s 50 mm (2.0 in) over 9 days. The humidity also rises in November to 92%, making the air feel colder despite the similar amount of moisture. For more detailed information about November weather specifics, check out Mechelen weather in November.

September and December present stark contrasts in weather characteristics. In September, temperatures range significantly from a cool 4°C (39°F) to a warm 33°C (93°F), with an average of 16°C (60°F). The month experiences moderate rainfall, totaling 50 mm (2.0 in) over about 9 days, and a humidity level of 82%. In contrast, December brings a much chillier climate, with temperatures dipping from a minimum of -5°C (23°F) to a maximum of 15°C (60°F), averaging only 6°C (42°F). This month sees more frequent precipitation, accumulating 88 mm (3.5 in) across approximately 16 days, and higher humidity at 92%. For more details, you can check Mechelen weather in December.

Compare Mechelen's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Mechelen

As September rolls in, Mechelen experiences a notable shift in weather, embracing the transition from summer's warmth to autumn's coolness. The maximum temperatures can reach a sweltering 33°C (93°F), while the average hovers around a comfortable 16°C (60°F), much cooler than the height of summer. The crisp mornings, with lows dipping to 4°C (39°F), signal the onset of fall. With occasional rain bringing about 50 mm (2.0 in) of precipitation over 9 days and humidity levels at 82%, September offers a refreshing change that can be both invigorating and unpredictable. For a detailed understanding of the monthly weather patterns, check out Mechelen Climate.