September Weather in Chimay, Belgium

Last updated: August 21, 2025

In Chimay, Belgium, September brings a delightful transition from summer warmth to autumn crispness. The maximum temperature can reach a balmy 32°C (91°F), while the average settles at a comfortable 15°C (59°F). However, cool nights can dip to a chilly 3°C (37°F). This month witnesses 65 mm (2.5 in) of rainfall over about 10 days, contributing to an 81% humidity level that wraps the region in a gentle embrace. Whether exploring the picturesque countryside or enjoying local festivals, visitors can expect a month of varied weather, perfect for those who relish both sunny afternoons and refreshing breezes.

September Temperature in Chimay

In September, Chimay, Belgium transitions beautifully into early autumn, offering a delightful blend of warmth and briskness. With minimum temperatures around 3°C (37°F) and average highs reaching 32°C (91°F), the weather is still pleasantly mild, making it one of the last remnants of summer's warmth. As the month progresses, the average temperature hovers around 15°C (59°F), inviting both locals and visitors to enjoy outdoor activities. This month marks a shift from the extremes of July and August, which boasted maximals nearing 38°C (101°F), showcasing a more temperate climate ideal for exploring the stunning landscapes and rich heritage of this charming town.

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

The chart illustrates September temperature patterns in Chimay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chimay, 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).
JanFebMarAprMayJunJulAugSepOctNovDec374044495563656559524340
Data source: Temperature data for Chimay 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 Chimay

In September, Chimay, Belgium, experiences a notable shift in its weather patterns as summer gives way to autumn. With 65 mm (2.5 in) of precipitation over 10 days, the month marks a decrease in rainfall compared to the previous months, yet it still maintains a significant level of moisture. This drop is a breath of fresh air following the more saturated summer months, where August saw 85 mm (3.3 in) of rain over 14 days. As the landscape transitions, the shorter, cloudier days of September herald the approach of the wetter autumn months, preparing the region for the heavier rains of October, which typically averages 100 mm (3.9 in). This continuity of rainfall illustrates Chimay's characteristic climate, with each month's precipitation reflecting a delicate balance between seasonal change and environmental needs.

September Precipitation Trends in Chimay

The chart displays monthly precipitation patterns in Chimay, 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 Chimay, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec83869347787172856510074131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chimay

In September, Chimay experiences a noticeable shift in humidity, with levels settling at around 81%. This slight uptick comes after the balmy days of summer, where humidity dipped to its annual low of 76% in August. As autumn approaches, the air begins to feel crisper, yet it retains a hint of the lingering warmth from the preceding months. This transitional phase marks a gradual return to the higher humidity levels typical of the coming months, as evidenced by the 88% in October, setting the stage for a cozy, enveloping atmosphere in the heart of Belgium.

September Average Humidity in Chimay

This chart illustrates the average monthly humidity levels in Chimay, 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 Chimay is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%84%83%83%80%76%81%88%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chimay

In September, Chimay, Belgium experiences a moderate UV Index of 5, translating to a burn time of 30 minutes for unprotected skin. As summer winds down, this marks a slight decline from the very high levels seen in the preceding months of July and August, which both peaked at an 8. Nonetheless, it's important to remain cautious, as UV exposure can still pose risks, especially during sunny days. Compared to earlier in the year, such as April's high of 6, or the moderate levels in March (4) and February (3), September offers a more temperate balance, making it a great time to enjoy the outdoors while being mindful of sun protection. For more detailed insights, check out the Chimay UV Index.

Maximum UV Index Levels in Chimay for September

The chart shows the monthly maximum UV Index (UVI) for Chimay 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 Chimay typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234688875421
Data source: Chimay 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 Chimay

As summer gently fades, September in Chimay, Belgium embraces a pleasant transition marked by approximately 317 hours of sunshine. This month showcases a notable decline from the peak summer months, where June and July bask in over 400 hours of sunlight, yet still outshines the dreariness of the upcoming autumn. With the days gradually shortening, September retains a generous warmth, allowing residents and visitors to enjoy the lingering outdoor activities before the cooler weather descends. This month acts as a beautiful bridge between the vibrancy of summer and the crispness of fall, encouraging a reflective pause in the sun's embrace.

Monthly Sunshine Duration in Chimay: September Highlighted

The September sunshine duration represents the total number of hours Chimay 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.
JanFebMarAprMayJunJulAugSepOctNovDec110h184h252h342h388h402h404h379h317h243h180h124h
Data source: Chimay September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chimay During September

In Chimay, Belgium, September offers a 37% chance of sunny weather, marking an interesting transition as the year progresses. This percentage is notably higher than the summer months of July and August, which both hover around 31% and 27%, respectively. September's likelihood of sunshine is an encouraging sign for those hoping to enjoy the crisp autumn air. Interestingly, this month outshines May, which boasts a 33% chance, illustrating an unusual spike in sunny potential just before the leaves turn. As the days begin to shorten and the weather cools, this upward trend in sunshine chances makes September an appealing month for outdoor activities in Chimay.

Percentage of Sunny Days in September in Chimay

The chart illustrates the percentage of sunny days in Chimay 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 Chimay experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec9%28%41%54%33%31%31%27%37%33%21%18%
Data source: Chimay September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chimay in September

As summer gracefully fades into autumn, September in Chimay, Belgium, offers a balanced 12 hours of daylight. This month marks a gentle decline from the sun-drenched days of June, which record the longest daylight at 16 hours. Following the peak, daylight hours steadily decrease through the latter months, reflecting the seasonal transition. Compared to August’s 14 hours, September provides just enough light to enjoy the lingering warmth of early fall, before the days shorten further into October's 10 hours. This gradual shift not only paints a picturesque backdrop but also sets the stage for the cozy embrace of autumn.

Average Daylight Hours in Chimay for September

The chart illustrates the variation in daylight duration in Chimay throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 36m10h 5m11h 55m13h 48m15h 26m16h 17m15h 50m14h 22m12h 33m10h 41m9h 1m8h 8m
Data source: Chimay daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Chimay

As September rolls into Chimay, Belgium, the average wind speed dips to 3.0 m/s (7 mph), mirroring the gentler breezes typical of late summer. This marked reduction follows a predominantly lively wind pattern from earlier months, with speeds peaking in the spring. The transition reflects the natural winding down of summer’s vibrant energy, as the winds grow softer in preparation for autumn's arrival. While September brings cooler temperatures, the calmer winds create a serene atmosphere, making it a perfect time to enjoy the picturesque scenery and the charm of Chimay's surroundings. As the year progresses into the vibrant colors of October, wind speeds pick back up to 4.3 m/s (10 mph), heralding a lively autumn ahead.

Average September Wind Speed in Chimay

The chart displays monthly wind speed patterns in Chimay, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.74.23.74.53.03.73.53.0 m/s4.33.44.2
Data source: Chimay September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Chimay Compares to Other Months

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

September typically offers a much warmer climate compared to January, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 32°C (91°F) and an average of 15°C (59°F). This month sees around 65 mm (2.5 in) of precipitation over approximately 10 days, accompanied by a humidity level of 81%. In contrast, January is significantly colder, featuring temperatures that dip as low as -8°C (19°F) and peak at 13°C (55°F), averaging just 3°C (37°F). The winter month experiences slightly higher precipitation at 83 mm (3.3 in) spread over about 13 days, with humidity levels rising to 91%. For more detailed information, check out Chimay weather in January.

In September, temperatures can vary significantly, ranging from a chilly 3°C (37°F) at night to a warm 32°C (91°F) during the day, with an average of 15°C (59°F). The month sees around 65 mm (2.5 in) of precipitation over approximately 10 days, with humidity levels at 81%. Conversely, February presents a much colder climate, with minimum temperatures dropping to -9°C (16°F) and a milder maximum of 19°C (66°F); the average temperature rests at 4°C (40°F). February also has slightly more rainfall, totaling 86 mm (3.4 in) across 14 days, while humidity remains relatively high at 89%. For more detailed insights about February's weather in Chimay, visit Chimay weather in February.

September and March display contrasting weather patterns that reflect the transition between summer and spring. In September, temperatures range from a mild 3°C (37°F) at night to a warm 32°C (91°F) during the day, with an average of 15°C (59°F). This month sees about 65 mm (2.5 in) of precipitation over approximately 10 days, and humidity levels hover around 81%. In contrast, March experiences colder temperatures, with a minimum of -10°C (14°F) and a maximum of 22°C (72°F), averaging just 7°C (44°F). Precipitation is higher in March at 93 mm (3.7 in) over 15 days, accompanied by slightly increased humidity at 86%. These differences highlight the shift in seasons, making September generally warmer and March distinctly cooler and wetter. For more details, you can check Chimay weather in March.

In comparing the weather of September and April, September generally boasts warmer temperatures, with average highs reaching up to 32°C (91°F) compared to April's maximum of 26°C (78°F). However, April experiences slightly cooler nights, with a minimum of -3°C (26°F), while September's minimum is a milder 3°C (37°F). Precipitation is higher in September at 65 mm (2.5 in) over 10 days, compared to April's 47 mm (1.9 in) over 9 days, indicating that September may be slightly wetter. Additionally, both months have high humidity levels, with September at 81% and April at 84%. For more detailed insights into April weather, you can explore Chimay weather in April.

September and May both offer a range of temperatures, but September tends to be warmer overall. In September, the minimum temperature is 3°C (37°F) with an average of 15°C (59°F) and a maximum reaching 32°C (91°F). In contrast, May has a lower minimum of 0°C (32°F), an average of 13°C (55°F), and a maximum of 30°C (86°F). While September experiences 65 mm (2.5 in) of precipitation over about 10 days, May has slightly higher precipitation at 78 mm (3.1 in) spread across 14 days, contributing to a similarly humid atmosphere with humidity levels around 81% and 82%, respectively. For more detailed information about May weather, check Chimay weather in May.

When comparing the weather in September to June, both months exhibit similar temperature ranges, with September boasting a minimum temperature of 3°C (37°F) and an average of 15°C (59°F), while June starts slightly warmer with a minimum of 5°C (42°F) and an average of 17°C (63°F). Both months can reach a maximum of 32°C (90°F/91°F), showcasing the warmth of late spring and early autumn. Precipitation is slightly higher in June, totaling 71 mm (2.8 in) over 11 days compared to September's 65 mm (2.5 in) over 10 days. Humidity levels are comparable, with September at 81% and June slightly higher at 82%. For a closer look at the weather specifics for June, you can check Chimay weather in June.

In comparing the weather of September and July, one can observe notable differences in temperature and precipitation patterns. September sees a temperature range from a cooler minimum of 3°C (37°F) to an average of 15°C (59°F), peaking at 32°C (91°F). In contrast, July offers warmer conditions with a minimum of 8°C (46°F), an average of 18°C (65°F), and a maximum of 38°C (101°F). Both months experience significant precipitation, with July slightly higher at 72 mm (2.8 in) over 11 days compared to September’s 65 mm (2.5 in) spread over 10 days. Humidity levels are quite similar, with September at 81% and July at 80%. For more specific insights about July’s weather, check Chimay weather in July.

In comparing the weather between August and September, it's evident that September experiences lower maximum temperatures, with highs reaching only 32°C (91°F) compared to August's peak of 37°C (98°F). The average temperature also drops, moving from 18°C (65°F) in August to 15°C (59°F) in September. Additionally, September sees increased humidity at 81%, which is slightly higher than August's 76%. Precipitation levels are also noteworthy; September receives 65 mm (2.5 in) over 10 days, whereas August has a bit more rainfall at 85 mm (3.3 in) spread across 14 days. For more detailed information, you can refer to Chimay weather in August.

In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 32°C (91°F), with an average of 15°C (59°F). The month experiences about 65 mm (2.5 in) of precipitation over approximately 10 days, and humidity levels sit at 81%. In contrast, October sees a drop in average temperature to 11°C (52°F), with a minimum of 1°C (34°F) and a maximum of 24°C (76°F). Precipitation increases to 100 mm (3.9 in) over 14 days, and humidity rises to 88%. This transition indicates a shift toward cooler and wetter conditions as autumn progresses. For more details about October weather, you can visit Chimay weather in October.

September weather is characterized by a wider temperature range, with minimums around 3°C (37°F) and maximums reaching up to 32°C (91°F), resulting in an average temperature of 15°C (59°F). In contrast, November sees cooler temperatures, with lows dropping to -3°C (28°F) and highs peaking at 18°C (64°F), leading to a significantly lower average of 6°C (44°F). Precipitation is slightly more intense in November, with 74 mm (2.9 in) falling over 12 days, compared to September's 65 mm (2.5 in) over 10 days. Additionally, November features higher humidity levels at 92%, compared to September's 81%. For a closer look at November conditions, check out Chimay weather in November.

The weather in September is significantly milder compared to December, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 32°C (91°F) and an average of 15°C (59°F). In contrast, December's temperatures dip much lower, reaching a minimum of -4°C (25°F) and averaging just 4°C (40°F), with highs of 14°C (57°F). Additionally, December sees more precipitation, with 131 mm (5.1 in) falling over 18 days, while September receives 65 mm (2.5 in) over just 10 days. The humidity also increases in December, peaking at 93%, compared to September’s 81%. For more details on December weather conditions, you can visit Chimay weather in December.

Compare Chimay's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Chimay

As September unfolds in Chimay, it brings a unique blend of warmth and cooler breezes, setting it apart from the sizzling summer months. The temperature transition is evident, with a maximum reaching 32°C (91°F) while the average settles around a comfortable 15°C (59°F). This month not only experiences mild weather but also witnesses increased humidity at 81%, creating a refreshing yet humid atmosphere. Rainfall appears, contributing to the total of 65 mm (2.5 in) spread over about 10 days, hinting at the gradual shift towards the wetter fall season. For those keen on understanding how September's climate compares with the rest of the year, explore more at Chimay Climate.