Last updated: August 21, 2025
September in Ixelles, Belgium offers a delightful blend of weather characteristics that reflect the transition from summer to autumn. With maximum temperatures reaching 33°C (91°F), residents can appreciate a few warm days, while the average temperature settles around 15°C (60°F), providing a pleasant comfort level. Morning chill is not uncommon, as minimum temperatures drop to 4°C (39°F). While the month sees 9 days of precipitation, accumulating to around 55 mm (2.2 in), the humidity level remains relatively high at 82%, giving the air a crispness that is characteristic of early fall. Overall, September in Ixelles showcases a charming mix of warmth and coolness, perfect for enjoying the changing seasons.
In September, Ixelles, Belgium experiences a delightful transition from summer's warmth to the crispness of autumn. The temperatures showcase a wide range, with lows around 4°C (39°F) and highs soaring to a remarkable 33°C (91°F). This month stands out with an average of 15°C (60°F), offering comfortable weather that encourages outdoor activities. As the sweltering summer days begin to wane, September provides a perfect balance, making it an ideal time to explore the charming streets of Ixelles while enjoying the softening sunlight and vibrant fall colors.
September in Ixelles, Belgium, marked a moderate transition in precipitation, as the month brought 55 mm (2.2 in) of rainfall over just 9 days. This decline from the 80 mm (3.2 in) recorded in August signals the gradual shift toward autumn, characterized by less frequent but still significant rain. The overall trend showcases a steady tapering off of summer deluges, with September typically receiving less precipitation than its preceding months, yet still managing to contribute to the overall annual rainfall. As the crispness of early autumn settles in, the diminishing rain lays the foundation for the more robust October, which often sees an uptick in precipitation.
In September, Ixelles experiences a slight uptick in humidity, with levels reaching 82% after the drier months of summer. This marks a return to more humid conditions similar to those seen in late spring. As the seasons transition, the humidity levels begin to rise again, signaling the approach of autumn. Throughout the year, September's humidity is notably lower than the winter peaks in November and December, which hover around 92%. This trend showcases the region's shift from the warmth and relative dryness of summer, allowing residents to enjoy the mild early fall before the wetter months set in.
In September, Ixelles, Belgium experiences a moderate UV Index of 5, indicating a shift as summer fades into fall. This month brings a burn time of approximately 30 minutes, urging sun-seekers to balance their enjoyment of the outdoors with skin protection. Following the very high levels of July and June, where exposure was critically brief at just 15 minutes, September's UV levels offer a more tolerant environment for outdoor activities. However, as the sun begins to lower in the sky, maintaining awareness of UV exposure remains essential for both skin health and safety. For more detailed information on the UV Index throughout the year, visit Ixelles UV Index.
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As September unfolds in Ixelles, Belgium, the city basks in a generous 319 hours of sunlight, marking a pleasant transition into autumn. Following the sun-drenched peak of summer, where July shines brightest with 406 hours, September still retains a significant amount of golden rays, although it sees a notable decrease compared to the sun-filled months preceding it. This gentle decline is a prelude to the more subdued light of the coming months, with October dipping down to 240 hours, and further into the winter, where daylight shrinks to just 143 hours by December. The trend highlights September as a beautiful bridge between summer’s warmth and winter's approach, offering residents and visitors alike a chance to relish the lingering sunlight before the darker days set in.
In Ixelles, Belgium, September brings a moderate 36% chance of sunny weather, marking a slight uptick from the summer months of July and August, which hover around 29% to 34%. This historically positive trend indicates that as the days begin to cool, there's still a decent opportunity to bask in the sun before the autumn chill sets in. The likelihood of sunshine in September is also notably higher than the dreary winter months, offering residents and visitors alike a refreshing farewell to summer. With clear skies becoming increasingly elusive in the following months, September can be a delightful time to enjoy outdoor activities amid the crisp fall air.
In Ixelles, Belgium, September marks a transition as the summer days begin to wane, offering 12 hours of daylight. This month showcases a noticeable decline from the sun-drenched heights of 16 hours in June and 15 hours in July, gradually flowing into the softer glow of autumn. As September progresses, the days continue to shrink, preparing the landscape for a more subdued light that characterizes the upcoming months. The rhythm of nature is evident, with the gradual reduction in daylight hinting at the cozy ambiance of the cooler seasons that lie ahead, inviting residents to savor the last warm days before autumn fully settles in.
As the summer days wane, September in Ixelles brings a gentle shift in the wind, with average speeds settling at 3.0 m/s (7 mph). This marks a notable decrease from the summer months, where breezes danced more vigorously around 3.3 m/s (7 mph) in July and 3.4 m/s (8 mph) in August. The transition into autumn signals a calming of the air, reflecting the dipping temperatures as nature prepares for the cooler months ahead. With winds lower than those in spring, which peaked at 4.6 m/s (10 mph) in February, September offers a tranquil atmosphere, perfect for leisurely strolls through the picturesque streets of Ixelles. As the wind whispers through the trees, it invites residents and visitors alike to embrace the charm of the season.
Weather in Ixelles varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ixelles, focusing on differences in temperature, rainfall, humidity, and UV levels.
September's weather is characterized by a wider temperature range, with minimums around 4°C (39°F) and maximums reaching up to 33°C (91°F), making it a generally warmer month with an average temperature of 15°C (60°F). In contrast, January brings a stark shift in conditions; temperatures drop significantly, with minimums plummeting to -7°C (20°F) and maximums only reaching 14°C (57°F), resulting in a cooler average of 4°C (39°F). Additionally, while September has a relatively lower precipitation level of 55 mm (2.2 in) over 9 rainy days, January sees slightly more precipitation at 65 mm (2.5 in) over 12 days, accompanied by higher humidity at 91%. For more details on the specific conditions you can expect in January, visit Ixelles weather in January.
In comparing the weather of September and February, we see distinct differences that reflect the transition from summer to winter. September typically boasts a wider temperature range, with daily averages reaching up to 15°C (60°F) and maximums soaring to 33°C (91°F), while February's temperatures are much cooler, averaging around 5°C (42°F) and peaking at 19°C (66°F). Precipitation levels are also notable; while September experiences 55 mm (2.2 in) over 9 days, February sees slightly more rain at 69 mm (2.7 in) across 12 days. Additionally, humidity levels are higher in February at 89%, compared to 82% in September. For a more detailed look at February weather, you can explore Ixelles weather in February.
When comparing the weather in September and March, we see notable differences in temperature and precipitation patterns. September features a much warmer range, with minimum temperatures around 4°C (39°F) and averages peaking at 15°C (60°F), while March is significantly colder, starting from a minimum of -8°C (17°F) and averaging 7°C (45°F). In terms of maximum temperatures, September can soar to 33°C (91°F), contrasting starkly with March's mild peak of 23°C (74°F).
Precipitation is slightly higher in March, with 70 mm (2.8 in) over 14 days compared to September's 55 mm (2.2 in) across 9 days, and humidity levels are also elevated in March at 87% versus September’s 82%. For more detailed insights about the weather in March, you can visit Ixelles weather in March.
In comparing the weather of September and April, it is clear that both months present a range of temperatures, but with distinct characteristics. September typically enjoys warmer weather, with average temperatures around 15°C (60°F) and highs reaching up to 33°C (91°F), whereas April's average stands at a cooler 10°C (50°F), peaking at 27°C (80°F). Precipitation is slightly higher in September, totaling 55 mm (2.2 in) over 9 days compared to April's 37 mm (1.5 in) over 8 days. Additionally, September tends to have a bit more humidity at 82%, compared to April's 85%. For those interested in more specific details about April weather, you can check Ixelles weather in April.
September and May present similar humidity levels at 82%, but their temperature ranges exhibit notable differences. In September, the temperatures can reach a maximum of 33°C (91°F) and an average of 15°C (60°F), while May sees a slightly cooler maximum of 31°C (88°F) and an average of 13°C (57°F). Both months experience comparable rainfall, with September receiving 55 mm (2.2 in) over 9 days, and May slightly higher at 58 mm (2.3 in) over 12 days. For more details on the weather in this spring month, check out Ixelles weather in May.
In comparing the weather between September and June, we see that both months have similar humidity levels at 82%, creating a consistent level of moisture in the air. However, September experiences a wider temperature range with a minimum of 4°C (39°F) and an average of 15°C (60°F), while June's temperatures are generally milder, starting at a minimum of 7°C (44°F) and averaging 18°C (65°F). Precipitation is slightly higher in June at 66 mm (2.6 in) compared to September's 55 mm (2.2 in), with both months featuring rainfall on 9 days. For a more detailed look at weather patterns during this time, you can visit Ixelles weather in June.
When comparing the weather in September and July, it's clear that July tends to be warmer overall. In July, temperatures range from a minimum of 8°C (46°F) to a maximum of 39°C (102°F), with an average of 19°C (66°F). In contrast, September experiences a broader temperature range, with minimums reaching 4°C (39°F) and maximums hitting 33°C (91°F), averaging around 15°C (60°F). Both months see a notable amount of precipitation, with July receiving 71 mm (2.8 in) over 11 days and September experiencing 55 mm (2.2 in) over 9 days. Humidity levels are relatively similar, with September at 82% and July slightly lower at 80%. For more details on the specifics of July weather, visit Ixelles weather in July.
In comparing the weather of September and August, it is evident that September experiences a cooler overall climate, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 33°C (91°F), while August sees higher figures, with a minimum of 8°C (46°F), an average of 19°C (66°F), and a peak of 36°C (97°F). Additionally, September has slightly less precipitation at 55 mm (2.2 in) over 9 days compared to August’s 80 mm (3.2 in) spread across 14 days. Despite the warmer temperatures in August, it also boasts lower humidity at 76%, compared to September's higher humidity levels of 82%. For more details on August weather specifics, check out Ixelles weather in August.
September typically offers a wider temperature range, with minimums of 4°C (39°F) and maximums reaching up to 33°C (91°F), while the average sits at a comfortable 15°C (60°F). In contrast, October sees cooler temperatures throughout, with minimums dropping to 1°C (34°F) and a maximum of only 25°C (77°F), resulting in a lower average of 12°C (54°F). Additionally, October experiences more precipitation, totaling 76 mm (3.0 in) over 13 rainy days, compared to September's 55 mm (2.2 in) across 9 days. Humidity also rises in October, reaching 89% compared to September's 82%. For more detailed insights on October's weather, check out Ixelles weather in October.
September and November present distinctly different weather patterns. In September, temperatures range from a mild 4°C (39°F) at night to a warm 33°C (91°F) during the day, with an average of 15°C (60°F). The weather is relatively humid, with an average humidity of 82% and about 55 mm (2.2 in) of precipitation over 9 days. In contrast, November brings chillier conditions, with a minimum temperature dropping to -2°C (28°F) and a maximum of 18°C (65°F), averaging just 7°C (45°F). The month is also wetter, receiving around 57 mm (2.2 in) of precipitation spread over 11 days, coupled with a higher humidity level of 92%. For more details on November conditions, you can check Ixelles weather in November.
September and December present stark contrasts in weather conditions. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 33°C (91°F), with an average of 15°C (60°F), making it a warm month. With 55 mm (2.2 inches) of precipitation over 9 days, the humidity sits at a comfortable 82%. In contrast, December sees colder temperatures, with a minimum of -5°C (24°F), an average of 5°C (42°F), and a maximum of 15°C (59°F). This month experiences more rainfall, totaling 93 mm (3.7 inches) spread over 17 days, and a higher humidity level of 92%. To learn more about the specifics, visit Ixelles weather in December.
As September unfolds in Ixelles, the weather presents a striking transition from the sweltering heat of summer to the refreshing coolness of autumn. While temperatures can still reach a toasty 33°C, the average dips to a mild 15°C, and the crisp nights may remind you of the approaching fall. Precipitation is more frequent this month, with about nine days of rain adding to the already elevated humidity of 82%. This blend of warm days and cooler evenings creates a unique atmosphere, making September a distinctive time to experience Ixelles. For a deeper dive into the area's climate nuances, visit Ixelles Climate.