September Weather in Namur, Belgium

Last updated: August 21, 2025

Experience the vibrant weather of Namur, Belgium in September, where temperatures fluctuate from a pleasant minimum of 2°C (37°F) to a sultry maximum of 33°C (92°F). The average temperature settles around 15°C (59°F), providing a comfortable backdrop for exploring this historic city. While you might enjoy the sunny days, be prepared for some rain, as the month sees approximately 65 mm (2.5 in) of precipitation spread over 11 days. With an 82% humidity level, the air feels rich and alive, enhancing the beauty of the autumn transition.

September Temperature in Namur

In Namur, Belgium, September heralds the transition from summer's warmth to the crispness of autumn, offering a pleasantly mild climate. With daily temperatures ranging from a chilly 2°C (37°F) at night to a balmy 33°C (92°F) during the day, this month presents a delightful mix of early autumn flavors. The average temperature settles around 15°C (59°F), creating a comfortable atmosphere for outdoor activities and exploration. As the month progresses, the warmth of summer starts to wane, foreshadowing the cooler temperatures of October, yet September still invites lingering moments of sunshine and early fall festivities. The shift in seasons is palpable, making it an ideal time to experience Namur’s beautiful landscapes in their transitional glory.

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

The chart illustrates September temperature patterns in Namur, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Namur, 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).
JanFebMarAprMayJunJulAugSepOctNovDec384144495664656559534441
Data source: Temperature data for Namur generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Namur

In September, Namur experiences a moderate amount of precipitation, with 65 mm (2.5 in) of rainfall spread across 11 days. This marks a slight decrease from the previous month, August, which recorded 89 mm (3.5 in) over 14 days, reflecting a transition toward the drier conditions typically seen in autumn. Throughout the year, June stands out with the highest rainfall at 78 mm (3.1 in), while April is the driest month at just 41 mm (1.6 in). As September draws closer to October, where rainfall increases to 86 mm (3.4 in) over 13 days, it's evident that Namur's weather is characterized by a dynamic balance of wet and dry spells, shaping its unique climate throughout the seasons.

September Precipitation Trends in Namur

The chart displays monthly precipitation patterns in Namur, 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 Namur, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec6973774267787789658660105
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Namur

As the summer months give way to September in Namur, Belgium, the humidity level returns to a more moderate 82%. This reflects a gradual change from the drier conditions of August, which experienced a low of 76% humidity. Notably, September experiences a uplift compared to the summer peak, hinting at the transition into the wetter fall season. This slight increase is part of a broader trend where humidity levels start to rise again, leading into the cooler months of October and November, which see readings climbing back to 89% and 92%, respectively. Thus, while September maintains a comfortable balance, it sets the stage for the inevitable increase in atmospheric moisture that characterizes the autumn months in Namur.

September Average Humidity in Namur

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

As summer fades into autumn, September in Namur, Belgium sees a noticeable dip in the UV Index, dropping to 5—signifying a moderate exposure risk with a burn time of 30 minutes for unprotected skin. This shift highlights a trend of decreasing UV intensity as the year progresses, following the peak summer months of June and July, which recorded a very high UV Index of 8. Even as the days become shorter and cooler, it's vital to remain aware of sun safety, as early autumn can still pose risks. For more insights on UV levels throughout the year, check out the Namur UV Index.

Maximum UV Index Levels in Namur for September

The chart shows the monthly maximum UV Index (UVI) for Namur 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 Namur typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234578875421
Data source: Namur 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 Namur

In September, Namur basked in a delightful 318 hours of sunshine, marking a graceful transition from the summer's peak brilliance. Following the sun-drenched months of July and June, which offered 401 and 400 hours respectively, September witnessed a soft decline in daylight, yet remained vibrant with more sunshine than the cooler months ahead. The gradual decrease in sunlight hours signals the approach of autumn, transitioning from the lush brightness of May and June to the crisp, golden days of fall. As sunlight ebbs, the beauty of Namur transforms, inviting locals and visitors alike to revel in the breathtaking scenery and warm hues of early autumn.

Monthly Sunshine Duration in Namur: September Highlighted

The September sunshine duration represents the total number of hours Namur 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.
JanFebMarAprMayJunJulAugSepOctNovDec115h196h262h342h392h400h401h379h318h239h183h129h
Data source: Namur September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Namur During September

In Namur, Belgium, September offers a notable increase in sunny weather compared to the earlier months, with a 36% chance of sunshine. This marks a subtle uptick from the summer months, reflecting a transition from the warmer season while still benefiting from the residual heat. As the autumn sets in, the likelihood of sunny days begins to dip compared to the peak of spring, where the chance of sun reaches 49% in April. Overall, September stands as a balancing act, providing a solid opportunity for sun-seekers before the clouds of autumn fully take over, making it an enticing time to explore the beauty of Namur.

Percentage of Sunny Days in September in Namur

The chart illustrates the percentage of sunny days in Namur 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 Namur experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec9%30%39%49%33%31%32%28%36%31%23%15%
Data source: Namur September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Namur in September

As summer transitions into autumn, Namur, Belgium experiences a shift in daylight duration that reflects nature's rhythm. In September, the city enjoys around 12 hours of daylight, providing a gentle decline from the sun-drenched days of summer, where the peak was 16 hours in June. This gradual decrease continues into October, reminiscent of March's early hints of spring, which also saw 11 hours of daylight. The progression underscores a seasonal pattern, with daylight fluctuating between 8 and 16 hours throughout the year. The mellow sunlight of September invites residents to savor the warmth before the shorter days of winter settle in, making it a perfect time for outdoor activities and enjoying the vibrant hues of autumn.

Average Daylight Hours in Namur for September

The chart illustrates the variation in daylight duration in Namur throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 32m10h 3m11h 55m13h 50m15h 29m16h 21m15h 54m14h 24m12h 33m10h 39m8h 57m8h 3m
Data source: Namur daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Namur

As September rolls into Namur, Belgium, the breezy ambiance is marked by an average wind speed of 2.9 m/s (7 mph), which represents a gentle decline from the warmer months of July and August. While summer often brings moderate gusts, September's winds tend to whisper rather than roar, making it a perfect time for pleasant strolls along the Meuse River. This lull in windspeed also hints at a transition towards the crisper conditions of autumn, with the coming months expected to pick up, returning to the norm of 4.4 m/s (10 mph) by October. Overall, the month serves as a bridge between the vibrant energy of summer and the tranquil embrace of fall, inviting locals and visitors alike to enjoy the changing scenery at a leisurely pace.

Average September Wind Speed in Namur

The chart displays monthly wind speed patterns in Namur, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.64.13.44.52.83.53.42.9 m/s4.43.44.2
Data source: Namur September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Namur Compares to Other Months

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

September and January present striking contrasts in weather. In September, temperatures range from a cool 2°C (37°F) at night to a warm 33°C (92°F) during the day, with an average of 15°C (59°F). The month experiences a moderate level of precipitation at 65 mm (2.5 in) over about 11 days, accompanied by relatively high humidity at 82%. Conversely, January is much colder, with minimum temperatures dropping to -8°C (18°F) and maximums reaching only 13°C (56°F), resulting in an average of just 3°C (38°F). This month has slightly higher precipitation at 69 mm (2.7 in) across approximately 12 days, along with even higher humidity levels at 91%. For more detailed insights, you can visit Namur weather in January.

September and February present contrasting weather patterns. In September, temperatures range from a mild 2°C (37°F) at night to a warm 33°C (92°F) during the day, with an average of 15°C (59°F). The humidity is relatively high at 82%, and rainfall occurs on about 11 days, totaling 65 mm (2.5 in). In contrast, February is considerably colder, with temperatures dipping as low as -11°C (12°F) at night and reaching a maximum of 19°C (66°F), averaging around 5°C (41°F). This month also sees heightened humidity at 89%, and slightly higher precipitation levels, with rain occurring on 12 days and accumulating to 73 mm (2.9 in). For a more detailed look at February weather, check out Namur weather in February.

September and March present significantly different weather patterns. In September, temperatures range from a cool minimum of 2°C (37°F) to a warm maximum of 33°C (92°F), with an average of 15°C (59°F). Precipitation levels are relatively moderate at 65 mm (2.5 in), falling over about 11 days, while humidity sits at 82%. In contrast, March experiences colder conditions, with a minimum of -10°C (15°F) and an average temperature of 7°C (45°F). The month typically sees a maximum of 23°C (74°F), but it also brings higher precipitation at 77 mm (3.0 in) over approximately 15 days, coupled with even higher humidity at 87%. For those interested in a more detailed look at the climate during March, visit Namur weather in March.

When comparing the weather in September and April, notable differences emerge. September tends to be warmer, with average temperatures ranging from a low of 2°C (37°F) to a high of 33°C (92°F), whereas April experiences cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 27°C (80°F). Precipitation is more frequent in September, falling over 11 days and totaling 65 mm (2.5 in), compared to April's 41 mm (1.6 in) over 8 days. Both months have high humidity, with September at 82% and April slightly higher at 85%. For more detailed insights on April's climate, you can check Namur weather in April.

In comparing the weather of September and May, both months exhibit similar humidity levels at 82%, creating a consistent moisture in the air. However, September tends to feature a wider temperature range, with minimums of 2°C (37°F) and maximums reaching 33°C (92°F), while May's temperatures range from a minimum of 0°C (32°F) to a maximum of 30°C (87°F). Precipitation is slightly higher in May, with 67 mm (2.6 in) over 14 days compared to September's 65 mm (2.5 in) over 11 days, indicating that both months can be quite rainy. For a closer look at the weather specifics in May, you can check this link: Namur weather in May.

In comparing the weather between September and June, both months experience similar maximum temperatures, reaching around 33°C (91°F) to 33°C (92°F). However, September tends to start cooler, with minimum temperatures dipping to 2°C (37°F), while June has a milder minimum of 6°C (44°F). The average temperature in June is slightly higher at 18°C (64°F) compared to September's 15°C (59°F). Additionally, June experiences more precipitation, with 78 mm (3.1 in) over 13 days, compared to September's 65 mm (2.5 in) over 11 days. Humidity remains consistent at 82% in both months, contributing to a similar feel despite the variations in temperature and precipitation. For more details, you can check the Namur weather in June.

When comparing the weather between September and July, notable differences emerge. September experiences a wider temperature range, with minimums dropping to 2°C (37°F) and maximums reaching 33°C (92°F), while July typically sees warmer conditions with minimum temperatures around 7°C (45°F) and highs peaking at 37°C (99°F). Precipitation levels are also slightly higher in July, averaging 77 mm (3.0 in) over 10 days, compared to September's 65 mm (2.5 in) across 11 days. Humidity remains relatively high in both months, with September at 82% and July slightly lower at 80%. For a detailed look at July's weather, you can visit Namur weather in July.

In comparing the weather between September and August, we can observe notable differences in temperature and precipitation patterns. September features a wider temperature range, with minimums dropping to 2°C (37°F) and maximums reaching 33°C (92°F), contrasted with August's milder minimum of 7°C (44°F) and maximum of 36°C (97°F). The average temperature in September is slightly lower at 15°C (59°F), compared to 18°C (66°F) in August. Additionally, September experiences higher humidity at 82%, while August's humidity is more comfortable at 76%. Precipitation is also somewhat more prevalent in August, with 89 mm (3.5 in) of rainfall over 14 days, compared to September’s 65 mm (2.5 in) over 11 days. For a deeper look into August's weather specifics, check out Namur weather in August.

September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 2°C (37°F) to a maximum of 33°C (92°F), with an average around 15°C (59°F). The month experiences about 65 mm (2.5 in) of precipitation over 11 days, and humidity levels are relatively high at 82%. Conversely, October sees cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 25°C (77°F), averaging 12°C (53°F). Precipitation increases to 86 mm (3.4 in) spread over 13 days, and humidity rises slightly to 89%. For more detailed insights, you can check Namur weather in October.

September features a wide temperature range, with minimums of 2°C (37°F), average highs around 15°C (59°F), and maximums reaching as high as 33°C (92°F). This month also experiences relatively high humidity at 82% and sees approximately 65 mm (2.5 in) of precipitation over 11 days. In contrast, November brings much cooler temperatures, with minimums dropping to -3°C (27°F) and average highs of just 7°C (44°F), peaking at 18°C (64°F). The precipitation remains similar at 60 mm (2.3 in) but occurs over an extra day (12 days), and humidity increases slightly to 92%. For more details on the November weather, you can refer to Namur weather in November.

September and December present contrasting weather patterns, showcasing the shift from late summer to winter. In September, temperatures range from a mild 2°C (37°F) at night to a warm 33°C (92°F) during the day, with an average of 15°C (59°F). The month experiences around 65 mm (2.5 in) of precipitation over 11 days and generally lower humidity levels of 82%. In stark contrast, December sees colder conditions with minimum temperatures dropping to -4°C (24°F) and an average of just 5°C (41°F), peaking at 15°C (58°F). Precipitation increases to 105 mm (4.1 in) spread across 18 days, while humidity rises slightly to 92%. For a detailed look at December's climate, check out Namur weather in December.

Compare Namur's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Namur

As September unfolds in Namur, the weather starts to shift, presenting a unique blend of warmth and coolness that sets it apart from the summer months. While temperatures can still peak at a summery high, the average feels distinctly fresher, giving way to a crispness in the air that hints at the approaching autumn. With an average humidity of 82% and intermittent rain over 11 days, this month marks a transition, as nature prepares for the cooler season. The 65 mm of precipitation signals a change from the drier summer months, making September a time of rejuvenation in the landscape. For a deeper dive into what Namur's climate has to offer, visit Namur Climate.