September Weather in Tournai, Belgium

Last updated: August 21, 2025

Tournai experiences a dynamic September climate marked by a maximum temperature reaching 32°C (90°F), providing warm days for outdoor activities. The average temperature settles around 16°C (61°F), while cooler nights can dip to a refreshing 4°C (40°F). Visitors should prepare for occasional showers, as 48 mm (1.9 in) of precipitation typically falls across 9 days of the month, contributing to the region's lush greenery. Additionally, humidity remains relatively high at 82%, creating a cozy atmosphere as summer transitions into autumn.

September Temperature in Tournai

In September, Tournai, Belgium experiences a pleasant transition from the summer heat to the cooler autumn days. With minimum temperatures around 4°C (40°F) and a comfortable average of 16°C (61°F), the month is marked by a gradual dip from the sweltering highs of 32°C (90°F) that can still be felt early in the month. This trend highlights a refreshing balance, as the days bring warmth while the nights invite cozy layers. The overall September climate offers an ideal backdrop for outdoor exploration, making it a delightful time to enjoy the beauty of Tournai as summer gracefully yields to fall.

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

The chart illustrates September temperature patterns in Tournai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tournai, 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).
JanFebMarAprMayJunJulAugSepOctNovDec404246505664666660544642
Data source: Temperature data for Tournai 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 Tournai

In September, Tournai experiences a notable shift in its precipitation patterns, with a total of 48 mm (1.9 in) of rainfall over 9 days. This marks a reduction compared to the wetter summer months, indicating the transition into autumn. Notably, September's precipitation is less than the 76 mm (3.0 in) recorded in August, highlighting a decrease as temperatures begin to cool. As part of this evolving trend, it’s also worth noting that September's rainfall aligns more closely with the drier spring months, like April and May, suggesting a potential seasonal rhythm that sets the stage for the heavier rainfall expected in the following months, particularly October, which typically averages 81 mm (3.2 in).

September Precipitation Trends in Tournai

The chart displays monthly precipitation patterns in Tournai, 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 Tournai, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec646970375857567648816098
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Tournai

September in Tournai, Belgium, sees a humidity level of 82%, which is a slight increase from the drier months of summer, where August recorded a low of 76%. As the transition to fall begins, the humidity starts to rise again, aligning more closely with the autumn months of October and November, which average 89% and 92%, respectively. This pattern reflects a consistent trend throughout the year, where humidity typically peaks during the late fall and winter, with January maintaining the highest level at 91%. Ultimately, September serves as a bridge, signaling the gradual return of moisture in the air after the summer's relatively comfortable climate.

September Average Humidity in Tournai

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

In September, Tournai experiences a moderate UV Index of 5, making it essential to be mindful of sun exposure as cooler days approach. With a burn time of about 30 minutes, it's a notable drop from the summer months, where June and July peaked at a very high 8. This transition reflects a gradual easing of sun intensity, encouraging outdoor enthusiasts to enjoy the lingering warmth while still protecting their skin. As autumn sets in, maintaining awareness of UV levels remains important, and you can stay informed by checking the Tournai UV Index.

Maximum UV Index Levels in Tournai for September

The chart shows the monthly maximum UV Index (UVI) for Tournai 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 Tournai typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224578875421
Data source: Tournai 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 Tournai

September in Tournai, Belgium, brings a delightful transition as summer gently gives way to autumn, with 321 hours of sunshine gracing the month. While this marks a noticeable decline from the sun-drenched days of July and June, which boast over 400 hours, it still outshines both the drizzly winter months and the early signs of spring. As the year progresses, sunshine hours gradually taper off; however, September remains a vibrant month, providing a warm embrace of light before the cooler days set in. The lingering warmth highlights a unique charm, making it an ideal time for leisurely strolls through the historic city, where every sunbeam illuminates Tournai's rich heritage.

Monthly Sunshine Duration in Tournai: September Highlighted

The September sunshine duration represents the total number of hours Tournai 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.
JanFebMarAprMayJunJulAugSepOctNovDec120h197h265h348h396h404h415h383h321h254h197h148h
Data source: Tournai September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Tournai During September

In Tournai, Belgium, the likelihood of sunny weather in September presents a modest chance, sitting at 37%. This figure reflects a transitional period as summer gracefully slips into autumn. Notably, September's probability of sunshine is an uptick compared to the peak summer months of July and August, which hover around 34% and 31%, respectively. However, it still falls short of the peak springtime allure seen in April, where sunny days become significantly more likely at 51%. Overall, while September offers a reasonable hope for enjoying the golden hues of early fall, those seeking sun-soaked days may find simpler pleasures in the vibrant warmth of late spring.

Percentage of Sunny Days in September in Tournai

The chart illustrates the percentage of sunny days in Tournai 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 Tournai experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec12%28%40%51%35%32%34%31%37%34%25%16%
Data source: Tournai September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Tournai in September

As autumn approaches, September in Tournai, Belgium, marks a gentle transition from the long, sunlit days of summer to the shorter days of fall. With approximately 12 hours of daylight, this month represents a gradual decrease from the peak of 16 hours in June and 15 hours in July. While daylight starts to wane in September, it still offers a comforting balance of light and shadow, inviting residents to savor the lingering warmth of the season. This gradual decline continues into the fall, as daylight diminishes to just 10 hours by October, reminding us of the cycle of nature and the cozy evenings that lie ahead.

Average Daylight Hours in Tournai for September

The chart illustrates the variation in daylight duration in Tournai throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 31m10h 2m11h 55m13h 50m15h 30m16h 22m15h 55m14h 25m12h 34m10h 39m8h 57m8h 2m
Data source: Tournai daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Tournai

As September breezes into Tournai, Belgium, the average wind speed slows to 2.9 m/s (6 mph), marking one of the calmest months of the year. This gentle wind softens the transition from summer to autumn, providing a serene backdrop as leaves begin to hint at their colorful transformation. Following the slightly brisker summer months of July and August, where winds lingered around 3.3 m/s (7 mph), September's air feels more tranquil and inviting. The shift toward October will see increases in wind speed again, but for now, September offers a peaceful respite before the chillier fall winds arrive. This month's quiet breezes create an atmosphere perfect for leisurely strolls along the scenic riversides, as the charm of Tournai unfolds in the golden light of early autumn.

Average September Wind Speed in Tournai

The chart displays monthly wind speed patterns in Tournai, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.04.53.93.34.32.83.33.32.9 m/s4.23.24.0
Data source: Tournai September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Tournai Compares to Other Months

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

When comparing the weather between September and January, a stark contrast emerges. September boasts a mild average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F), making it feel quite warm despite the occasional rain. In this month, precipitation is relatively low at 48 mm (1.9 in) over about 9 days, and humidity sits at a comfortable 82%.

In contrast, January brings much colder temperatures, with averages dropping to around 4°C (40°F) and lows plummeting to -6°C (21°F). This winter month is wetter, with 64 mm (2.5 in) of precipitation spread across 12 days and humidity levels rising to 91%. For a more detailed look at weather conditions during this time, check out Tournai weather in January.

September and February showcase distinctly different weather patterns. In September, temperatures range from a mild 4°C (40°F) at night to a warm 32°C (90°F) during the day, with an average temperature of 16°C (61°F). The month sees approximately 48 mm (1.9 in) of precipitation over about 9 days, aligning with a relative humidity of 82%. In contrast, February chills with minimum temperatures dropping to -7°C (19°F) and only reaching a maximum of 19°C (66°F), averaging around 6°C (42°F). This winter month experiences higher precipitation, totaling 69 mm (2.7 in) over 13 days, coupled with a humidity level of 89%. For a detailed look at February conditions, you can visit Tournai weather in February.

September and March weather exhibit notable differences. In September, temperatures range from a minimum of 4°C (40°F) to a maximum of 32°C (90°F), with an average of 16°C (61°F). The month sees about 48 mm (1.9 in) of precipitation occurring over roughly 9 days and a humidity level of 82%. In contrast, March experiences much cooler temperatures, ranging from a minimum of -8°C (18°F) to a maximum of 23°C (73°F), with an average of only 8°C (46°F). The precipitation in March is higher at 70 mm (2.8 in), spread over about 14 days, coupled with a relative humidity of 87%. For a more detailed look at March weather, you can visit Tournai weather in March.

In September, the weather tends to be warmer, with average temperatures around 16°C (61°F) and maximums reaching up to 32°C (90°F), making it suitable for outdoor activities. In contrast, April experiences cooler conditions, with average temperatures of 10°C (51°F) and a maximum of 26°C (79°F), indicating a significant drop in warmth compared to September. While both months see some precipitation—with September recording 48 mm (1.9 in) over approximately 9 days and April registering 37 mm (1.4 in) over about 7 days—the humidity remains high in both, at 82% in September and 85% in April. For a detailed look at the April weather in Tournai, you can visit Tournai weather in April.

In comparing the weather between September and May, we see noticeable differences in temperature and precipitation. September typically experiences a broader temperature range, with minimums of 4°C (40°F) and maximums reaching up to 32°C (90°F), while May's temperatures are slightly cooler with minimums of 1°C (34°F) and maximums around 29°C (85°F). Precipitation is more frequent in May, occurring over 13 days with a total of 58 mm (2.3 in), compared to September's 48 mm (1.9 in) spread over 9 days. Interestingly, both months maintain the same humidity level of 82%, making them feel similarly humid despite the variations in temperature and rainfall. For more details on May weather, you can visit Tournai weather in May.

The weather in September shows a moderate transition as temperatures range from a minimum of 4°C (40°F) to a maximum of 32°C (90°F), with an average temperature of 16°C (61°F). In contrast, June experiences slightly warmer conditions with minimum temperatures around 6°C (43°F) and maximums peaking at 33°C (91°F), averaging 18°C (65°F). Both months see about 9 days of precipitation, but September receives less total rainfall at 48 mm (1.9 in) compared to June's 57 mm (2.2 in). Interestingly, the humidity levels remain consistent at 82% for both months, contributing to a generally muggy feel. For a detailed look at June's weather patterns, visit Tournai weather in June.

When comparing the weather in September to that of July, we can observe some notable differences. September generally experiences milder temperatures, with a minimum of 4°C (40°F) and an average of 16°C (61°F), compared to July's warmer range of 8°C (47°F) to an average of 19°C (66°F). July can peak at a scorching 40°C (104°F), significantly higher than September's maximum of 32°C (90°F). In terms of precipitation, both months see a similar amount, with July slightly wetter at 56 mm (2.2 in) over 10 days, compared to September's 48 mm (1.9 in) across 9 days. Humidity levels remain comparable, with September at 82% and July slightly lower at 80%. For a detailed overview, you can check Tournai weather in July.

In comparing the weather between August and September, we notice a significant shift in temperatures and precipitation. August tends to be warmer, with minimum temperatures around 7°C (46°F) and average highs reaching 37°C (99°F), while September cools down with a minimum of 4°C (40°F) and an average maximum of 32°C (90°F). August also experiences more rainfall, totaling 76 mm (3.0 in) over 13 days, compared to September's 48 mm (1.9 in) over 9 days. Interestingly, the humidity in September is slightly higher at 82%, compared to 76% in August. For more details on the weather in August, check out Tournai weather in August.

In September, temperatures typically ranged from a minimum of 4°C (40°F) to a maximum of 32°C (90°F), with an average of 16°C (61°F). The month saw around 48 mm (1.9 in) of precipitation over 9 days, accompanied by relatively high humidity levels at 82%. In contrast, October experiences cooler temperatures, with a minimum of 1°C (35°F), an average of 12°C (55°F), and a maximum of 25°C (77°F). The precipitation increases to 81 mm (3.2 in) spread over 13 days, coupled with a rise in humidity to 89%. For more detailed information, you can check Tournai weather in October.

September and November present contrasting weather patterns as summer transitions into autumn. In September, temperatures can range from a minimum of 4°C (40°F) to a warm maximum of 32°C (90°F), with an average of 16°C (61°F). The month typically sees 48 mm (1.9 in) of precipitation over about 9 days, accompanied by a relatively high humidity of 82%. In contrast, November is much cooler, with temperatures dropping to a minimum of -2°C (30°F) and reaching a maximum of 19°C (66°F), resulting in an average temperature of 8°C (46°F). This month experiences slightly higher rainfall at 60 mm (2.4 in) over 11 days, alongside an increase in humidity to 92%. For a detailed look at what to expect, check out Tournai weather in November.

In September, the weather in Tournai presents a warm climate with average temperatures reaching 16°C (61°F) and maximum highs of 32°C (90°F). Despite the warmth, the month sees a total of 48 mm (1.9 in) of rainfall over about 9 days, coupled with a relatively high humidity of 82%. In contrast, December brings much cooler conditions, with average temperatures dropping to 6°C (43°F) and maximums only reaching 15°C (59°F). This month experiences significantly increased precipitation, totaling 98 mm (3.9 in) across 17 days, and humidity rises to 92%. For more detailed information about the weather in December, you can visit Tournai weather in December.

Compare Tournai's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Tournai

As September arrives in Tournai, the weather begins to transition from the warmth of summer to the crispness of autumn. With average temperatures settling around a comfortable 16°C (61°F), residents experience a delightful change, marked by occasional highs reaching up to 32°C (90°F) that remind us of the lingering summer heat. However, the month also brings a notable increase in humidity, hovering at 82%, alongside 9 days of precipitation that contribute to the lushness of the region. This blend of warm days and cooler nights sets September apart, offering a refreshing and vibrant atmosphere, ideal for enjoying the transition of the seasons. For a closer look at Tournai's climate throughout the year, visit Tournai Climate.