Last updated: August 21, 2025
Experience the charming September weather of Diekirch, Luxembourg, where temperatures range from a pleasant 3°C (38°F) during the cooler nights to a warm 32°C (90°F) on sunny days. With an average temperature of 15°C (59°F), this month provides a delightful blend of crisp autumn air and occasional warmth. Visitors can expect 58 mm (2.3 in) of rainfall spread over 9 days, contributing to the lush greenery of the region. Humidity levels hover around 83%, adding a touch of moisture to the breezy atmosphere, making September a unique time to explore Diekirch’s scenic landscapes and vibrant local culture.
In September, Diekirch experiences a delightful transition into autumn, marked by milder temperatures that rejuvenate the air. With minimums around 3°C (38°F) and average highs reaching a comfortable 32°C (90°F), this month offers a perfect blend of lingering summer warmth and the crispness of the approaching fall. The average temperature of 15°C (59°F) reflects a notable drop from the highs of summer, signaling a gradual shift in both the weather and the landscape. As picturesque leaves begin to change, September stands as a sweet spot for enjoying the outdoors before the chill of winter settles in.
September in Diekirch, Luxembourg, typically brings a modest precipitation total of 58 mm (2.3 in) over 9 rainy days, making it one of the drier months of the year. This trend gently follows the late summer's 64 mm (2.5 in) in August, highlighting a gradual decrease as the season transitions into autumn. Interestingly, while precipitation amounts in September are lower than the earlier months, the consistent frequency of rain, similar to June and July, suggests a balanced climate that maintains moisture in the air. As October approaches, the rainfall picks up again, emphasizing the ebb and flow of Diekirch's seasonal weather dynamics.
In September, Diekirch, Luxembourg experiences a moderate humidity level of 83%, marking a slight uptick from the summer months, where humidity hovered around 80% in August. This subtle increase reflects the transition into autumn, as the air begins to cool and retain more moisture. Throughout the year, Diekirch's humidity generally exhibits a high trend, reaching its peak during the winter months, with January and February showing levels of 91% and 90%, respectively. As the seasons progress, there's a noticeable decline in humidity through late spring and summer, before the approach of autumn brings about this September increase. Overall, the pattern illustrates a striking seasonality in Diekirch's climate, with significant humidity levels persisting year-round.
In September, Diekirch experiences a UV Index of 6, placing it in the high exposure category. This suggests that while you're still able to enjoy outdoor activities, it's essential to take precautions, as the burn time is approximately 25 minutes for fair-skinned individuals. Following the peak summer months, which featured very high readings of 8 and 9, September signals a slight dip in UV levels, but they remain significant. This trend indicates that while autumn approaches, the need for sun protection is still relevant. For more detailed insights on UV levels throughout the year, visit Diekirch UV Index.
UV Risk Categories
As summer fades, September in Diekirch, Luxembourg, welcomes a delightful transition, boasting 313 hours of sunshine—enough to keep the lingering warmth of the season alive. This month reflects a gradual decline from the sun-drenched days of July and June, which recorded their peak at 410 and 406 hours, respectively. Yet, September still stands out as a vibrant period, offering more sunlight than the cooler months ahead, such as October with only 233 hours. The trend demonstrates a notable shift from the exuberance of summer to the crispness of autumn, inviting residents and visitors alike to savor the golden hues of early fall while soaking in the serene beauty that Diekirch has to offer.
In September, Diekirch, Luxembourg, experiences a 39% chance of sunny weather, marking a slight increase from the summer months. This month shows a notable contrast to the preceding August, which sees a lower likelihood of sunshine at 28%. As autumn approaches, the chances of sunny days dip compared to the earlier spring months, with April and March boasting 49% and 43% chances, respectively. Overall, September offers a delightful window of opportunities for enjoying the outdoors, with a moderate expectation for clear skies before the cooler fall weather settles in.
As summer fades into autumn, September in Diekirch, Luxembourg, offers a gentle transition with approximately 12 hours of daylight. This marks a noticeable decline from the sun-drenched 16 hours of June, reflecting the gradual shift towards shorter days. After the vibrant days of May and June, where the sun graced the skies for nearly half the day, September maintains a comfortable balance of light. While it may be less bright than the peak summer months, the 12 hours of daylight still provide ample opportunity to enjoy the changing colors of fall, hinting at the cozy days ahead as daylight reduces further into the cooler months.
As summer gently fades into autumn, September in Diekirch, Luxembourg, brings a noticeable shift in the breeze. With an average wind speed of 2.3 m/s (5 mph), this month marks the calmest point of the year, contrasting with the more varied gusts of the preceding months. The winds that were once playful in May and June, reaching up to 4.0 m/s (9 mph), now mellow significantly, inviting a serene atmosphere ideal for leisurely strolls through the charming streets. As temperatures begin to drop, the tranquil winds of September hint at the transition to cooler days ahead, creating a picturesque setting for reflection and relaxation amidst the subtle beauty of changing seasons.
Weather in Diekirch varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Diekirch, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather in Diekirch is characterized by warmer temperatures, with averages reaching 15°C (59°F) during the day and highs of up to 32°C (90°F). The month experiences a relatively moderate amount of precipitation, totaling 58 mm (2.3 in) over approximately 9 days, while humidity levels hover around 83%. In contrast, January brings much colder conditions, with daily averages dropping to around 2°C (36°F) and minimums plunging to -11°C (12°F). This winter month receives slightly more precipitation, about 67 mm (2.6 in) over 11 days, and experiences a higher humidity level of 91%. For a more detailed look at January weather, you can check Diekirch weather in January.
In September, temperatures range from a mild 3°C (38°F) to a warm 32°C (90°F), with an average of 15°C (59°F). This month sees relatively lower precipitation at 58 mm (2.3 in) across about 9 days, while humidity sits at a comfortable level of 83%. In contrast, February experiences much colder conditions, with temperatures dipping as low as -11°C (13°F) and peaking at 19°C (66°F), averaging just 4°C (39°F). Precipitation increases slightly to 70 mm (2.7 in) over 11 days, and humidity rises to 90%, making it feel even chillier. For more detailed insights into February weather, check Diekirch weather in February.
September and March exhibit contrasting weather patterns, reflective of their positions in the transition from summer to autumn and winter to spring, respectively. In September, temperatures range from a minimum of 3°C (38°F) to a pleasant average of 15°C (59°F), peaking at a warm 32°C (90°F). This month enjoys relatively lower precipitation, with 58 mm (2.3 in) falling over about 9 days and humidity levels at 83%. In stark contrast, March experiences a broader temperature range with a minimum of -12°C (12°F) and a maximum of 22°C (72°F), averaging at a cooler 6°C (43°F). This month sees increased precipitation totaling 76 mm (3.0 in) over approximately 14 days, alongside higher humidity at 88%. For a detailed overview of March weather in Diekirch, you can check Diekirch weather in March.
When comparing the weather in September and April, distinct differences emerge. September typically showcases a broader temperature range, with minimums around 3°C (38°F) and maximums reaching up to 32°C (90°F), resulting in an average temperature of 15°C (59°F). In contrast, April tends to be cooler, starting as low as -3°C (27°F) and peaking at 26°C (80°F), with an average of 9°C (49°F). Precipitation levels are slightly higher in September, averaging 58 mm (2.3 in) across 9 days, compared to April's 40 mm (1.6 in) over the same number of days. Both months maintain high humidity levels, with April at 84% and September at 83%. For more detailed information about April weather, you can visit Diekirch weather in April.
When comparing the weather in September to that of May, a few key differences emerge. September generally enjoys warmer average temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 32°C (90°F), whereas May experiences slightly cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 30°C (87°F). Despite the overall warmth in September, it does have a higher average humidity at 83%, compared to May's 81%. Precipitation is also a factor, with September receiving 58 mm (2.3 in) over 9 days, while May sees a bit more moisture at 69 mm (2.7 in) across 12 days. For more detailed weather insights, you can check Diekirch weather in May.
When comparing the weather in September and June, we see some notable differences. September tends to have a wider temperature range, with minimums dropping to 3°C (38°F) and maximums reaching up to 32°C (90°F). In contrast, June starts off warmer, with temperatures ranging from a minimum of 6°C (44°F) to a maximum of 34°C (93°F). Both months experience similar humidity levels, around 82-83%, but September sees slightly less precipitation with 58 mm (2.3 in) compared to June's 69 mm (2.7 in) over a few more rainy days. For more detailed insights on June weather, you can check Diekirch weather in June.
When comparing the weather in September and July, notable differences emerge in temperature and precipitation. September experiences a wider temperature range, with minimums of 3°C (38°F) and maximums reaching 32°C (90°F), while the average temperature is around 15°C (59°F). In contrast, July tends to be warmer overall, with minimums of 8°C (46°F) and maximums peaking at 38°C (101°F), and an average temperature of 19°C (66°F). Additionally, July sees slightly higher precipitation levels at 72 mm (2.9 in) over 9 days, compared to September's 58 mm (2.3 in) across the same number of days. Humidity levels remain similar, with July at 82% and September slightly higher at 83%. For more detailed information, you can visit Diekirch weather in July.
September weather is generally cooler than August, with minimum temperatures dropping to 3°C (38°F) compared to August's 6°C (43°F). The average temperature in September is 15°C (59°F), significantly lower than August's average of 19°C (66°F). However, September can still reach a maximum of 32°C (90°F), which is slightly lower than August's peak of 35°C (95°F). In terms of precipitation, September experiences 58 mm (2.3 in) over approximately 9 days, while August sees a bit more rain at 64 mm (2.5 in) across 12 days. Both months have relatively high humidity, with September at 83% and August slightly lower at 80%. For more details, you can check Diekirch weather in August.
In September, the weather is characterized by a wider temperature range, with minimums around 3°C (38°F) and maximums reaching up to 32°C (90°F), resulting in an average temperature of 15°C (59°F). The month experiences approximately 58 mm (2.3 in) of precipitation over about 9 days, all under humidity levels of 83%. In contrast, October brings cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 25°C (77°F), leading to an average of 11°C (51°F). This month is slightly wetter, recording 74 mm (2.9 in) of precipitation over 11 days, and humidity rises to 89%. For more details, check Diekirch weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a mild minimum of 3°C (38°F) to a warm maximum of 32°C (90°F), with an average of 15°C (59°F). The month sees approximately 58 mm (2.3 in) of precipitation over about 9 days and a humidity level of 83%. In stark contrast, November experiences colder temperatures, with a minimum of -4°C (25°F) and an average of just 5°C (42°F), peaking at 19°C (67°F). Additionally, November has slightly higher precipitation at 65 mm (2.6 in) spread over 12 days, and humidity rises to 91%. For more details, check out Diekirch weather in November.
In September, the weather is relatively mild with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 32°C (90°F), resulting in an average temperature of 15°C (59°F). The month sees about 58 mm (2.3 in) of precipitation over 9 days, and humidity levels sit at 83%. In contrast, December brings much colder conditions, with temperatures dropping significantly; the minimum reaches -5°C (23°F) and the maximum peaks at 14°C (57°F), resulting in an average of just 4°C (39°F). This month also experiences higher precipitation at 111 mm (4.4 in) over 18 days, accompanied by increased humidity at 93%. For more detailed weather information, you can check Diekirch weather in December.
September in Diekirch introduces a refreshing shift as summer wanes, bringing a pleasant mix of warm and cool days. With maximum temperatures reaching a comfortable 32°C and averages settling around 15°C, the month offers a delightful balance for outdoor activities. However, as the month progresses, expect the occasional rain, with 9 days marked by precipitation, enhancing the lush greenery characteristic of this time of year. Humidity hovers around 83%, contributing to a slightly muggy feel, especially during warmer afternoons. This transitional climate makes September uniquely vibrant compared to the sweltering summer months and the crisp onset of autumn. For a deeper insight into the region’s weather patterns, visit Diekirch Climate.