Last updated: February 26, 2025
September in Trier, Germany, showcases a delightful blend of temperatures, where daytime highs can reach a warm 31°C (88°F), offering a taste of late summer heat. The average temperature settles around a comfortable 14°C (58°F), while cool nights can drop to a brisk 3°C (37°F), creating a dynamic climate. Visitors should prepare for occasional rain, with 63 mm (2.5 in) of precipitation spread over 9 days throughout the month. With humidity levels hovering at 83%, the air remains refreshing, enhancing the city’s scenic beauty as it transitions into autumn.
September in Trier, Germany, marks the transition from the sweltering summer months to the cooler embrace of autumn. With minimum temperatures around 3°C (37°F) and daily averages reaching 14°C (58°F), the month offers a refreshing shift. Daytime highs can still soar to a comfortable 31°C (88°F), providing a perfect backdrop for outdoor activities amidst the stunning fall foliage. As the month progresses, nights grow crisper, hinting at the cooler temperatures to come. This blend of lingering warmth and emerging coolness creates a unique atmosphere, inviting locals and visitors alike to savor the beauty of early autumn in this historic city.
September in Trier, Germany, experiences a gentle transition into autumn, marked by a precipitation amount of 63 mm (2.5 in) over the month, somewhat typical for the season. With 9 rainy days, this month sees a slight reduction in both the frequency and volume of rain compared to the preceding summer months, showcasing a shift from the heavier downpours of August. The rainfall trend remains lower than the earlier months of spring, particularly March, which recorded 94 mm (3.7 in). As September unfolds, the soft patter of rain becomes a familiar sound, heralding the arrival of crisper days ahead while still maintaining the lush greenery typical of this picturesque region.
In Trier, Germany, September ushers in a slight uptick in humidity to 83%, a subtle rise from the drier summer months of July and August, which hovered around 82% and 80%, respectively. This increase marks the beginning of the transition into autumn, where humidity levels steadily climb back towards the higher ranges typical of the colder months. October sees a notable jump to 89%, while November and December peak at 91% and 93%. Overall, as the year progresses towards its end, Trier experiences a clear trend of increasing humidity, reflecting the changing seasons and the influence of cooler air.
As summer transitions into autumn, September in Trier, Germany brings a noticeable shift in the UV Index, which remains at a high level of 6. This marks a decrease from the peak summer months of June and July when the UV Index reached 9 and 8, respectively. Although the risk of sunburn is lower than in the height of summer, outdoor enthusiasts should still be mindful of their exposure, with a burn time of 25 minutes under direct sunlight. This trend reflects a gradual cooling, but sunny days can still pose risks; it's wise to stay protected. For detailed insights about sun safety in Trier, check out the Trier UV Index.
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As September unfolds in Trier, Germany, the city basks in the glow of 315 hours of sunshine, marking a delightful transition into autumn. The month showcases a significant dip from the sun-drenched days of summer, where July reaches a peak of 414 hours, yet it still retains a warm embrace compared to the colder months ahead. This gradual decline is reflective of the shifting seasons, with the summer's vitality giving way to the crisp charm of fall. The daylight hours in September are a gentle reminder of the lush brightness that defines the earlier months, particularly as it follows the vibrant sun hours of May and June. As the days shorten, the beautiful tapestry of Trier’s heritage glimmers under a softer light, perfect for leisurely strolls and quiet reflections.
In Trier, Germany, September offers a promising 40% chance of sunny weather, making it one of the more favorable months for sunshine. This marks a noticeable increase compared to the summer months of August and July, where the probabilities dip to 28% and 35%, respectively. However, the likelihood is not as high as in the spring months, where sunny days become more frequent, peaking in April with a 47% chance. As the year transitions towards autumn, September stands out as a sweet-spot month, providing a delightful opportunity for outdoor activities before the rainy days of October and November, which both reflect a much lower sunshine likelihood of 28% and 17%. Overall, those planning to enjoy the mild September in Trier can expect a relatively bright experience amid the changing seasons.
As the summer sun begins to retreat, September in Trier, Germany, offers a graceful transition into autumn with an average of 12 hours of daylight. This marks a gentle decline from the height of summer, where the days stretched to 16 hours in June. Following the vibrant blooms of May and the long summer evenings, September sees daylight gradually fade, settling into a cozy rhythm that ushers in the fall. This month serves as a bridge, delivering renewed vigor in daylight compared to the shorter days of October and November, which dip to 10 and 9 hours, respectively. The steady decrease clearly reflects nature’s cycle, inviting residents and visitors alike to savor the lingering warmth and beauty of early autumn.
As September unfolds in Trier, Germany, the gentle whispers of autumn begin to replace the balmy summer breezes. The average wind speed dips to 2.3 m/s (5 mph), marking a significant decrease from the lively conditions of late spring, where winds reached 4.0 m/s (9 mph) in May. This trend of diminishing gusts is consistent with the transition from summer to fall, as the month showcases the softening flow of air, creating a serene atmosphere perfect for strolling through the city’s historic streets. Notably, September stands as one of the calmest months of the year, reflecting a quiet shift as nature prepares for the cooler months ahead. Embracing this tranquil wind, residents and visitors alike can revel in the beauty of falling leaves and changing seasons.
The weather in Trier changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Trier and find detailed weather information for every month.
September weather is characterized by a wide temperature range, with minimums dropping to 3°C (37°F) and maximums reaching a warm 31°C (88°F). The average temperature settles around a mild 14°C (58°F), accompanied by relatively low precipitation of 63 mm (2.5 in) over about 9 days. Humidity levels in September are high at 83%, creating a muggy atmosphere as summer transitions to fall.
In stark contrast, January brings much colder temperatures, with minimums plummeting to -12°C (10°F) and maximums only reaching up to 11°C (53°F). The average temperature is a chilly 2°C (35°F). Precipitation increases slightly to 79 mm (3.1 in) over 12 days, and humidity is even higher at 91%, making January feel particularly brisk and damp. For more detailed insights into the January climate, visit Trier weather in January.
September and February present stark contrasts in weather. In September, temperatures range from a cool 3°C (37°F) at night to a warm 31°C (88°F) during the day, with an average temperature of 14°C (58°F). Humidity levels are relatively high at 83%, and there are about 9 days of precipitation totaling 63 mm (2.5 in). In contrast, February experiences chillier conditions with temperatures dropping to a minimum of -11°C (13°F) and reaching a maximum of 19°C (66°F), averaging only 3°C (38°F). This month sees more days of rain, with precipitation occurring on 12 days and totaling 82 mm (3.2 in), alongside heightened humidity at 90%. For a deeper dive into February's weather, visit Trier weather in February.
In comparing the weather of September and March, we see distinct differences in temperatures and precipitation patterns. September boasts a warm average temperature of 14°C (58°F), with highs reaching up to 31°C (88°F), while March has a cooler average of 6°C (42°F) with maximums only hitting 22°C (72°F). Precipitation is higher in March, totaling 94 mm (3.7 in) over 15 days compared to September's 63 mm (2.5 in) spread over 9 days, contributing to a slightly more humid environment with 88% humidity in March compared to 83% in September. For more detailed information on March weather, visit Trier weather in March.
September and April weather show a notable contrast in temperature and conditions. September typically experiences milder temperatures, ranging from a minimum of 3°C (37°F) to a maximum of 31°C (88°F), with an average of 14°C (58°F). In contrast, April starts cooler, with temperatures between -3°C (26°F) and 26°C (79°F), averaging around 9°C (49°F). Both months see similar precipitation patterns, with September receiving 63 mm (2.5 inches) and April slightly less at 44 mm (1.7 inches), both spread over 9 rainy days. Humidity levels are comparable too, with September at 83% and April at 84%. For more details about April weather in Trier, visit Trier weather in April.
When comparing the weather in September and May, both months showcase a similar maximum temperature of 31°C (88°F), but significant differences can be noted in their overall climates. September's temperatures range from a minimum of 3°C (37°F) to an average of 14°C (58°F), while May sees slightly cooler conditions, with temperatures dipping to a minimum of 0°C (32°F) and an average of 13°C (55°F). Additionally, September experiences 63 mm (2.5 in) of precipitation over 9 days, whereas May is wetter, with 82 mm (3.2 in) of rain spread over 13 days. Humidity levels in September are a touch higher at 83%, compared to May's 81%. For more specific insights into May's weather in Trier, visit Trier weather in May.
In comparing the weather of September and June, we see notable differences in temperatures and precipitation patterns. September tends to have milder temperatures, ranging from a minimum of 3°C to a maximum of 31°C, with an average of 14°C. In contrast, June is generally warmer, with lows of 6°C and highs reaching up to 33°C, giving it an average temperature of 18°C. Both months experience significant rainfall, but June has higher precipitation at 80 mm and more rainy days (12 days) compared to September's 63 mm and 9 rainy days. Humidity levels remain similar, with September at 83% and June slightly lower at 82%. For more detailed insights, check out Trier weather in June.
In comparing the weather of September and July, we see distinct differences in temperature and precipitation patterns. September experiences a wider temperature range, with a minimum of 3°C (37°F) and a maximum of 31°C (88°F), averaging at 14°C (58°F). In contrast, July is warmer, featuring a minimum of 8°C (46°F) and peaking at 37°C (100°F), with an average temperature of 19°C (66°F). Both months see significant precipitation, with September receiving 63 mm (2.5 in) over 9 days and July slightly wetter at 70 mm (2.8 in) over 11 days. Humidity levels are similar, with September at 83% and July slightly lower at 82%. For more detailed insights into July weather, check out this Trier weather in July.
In comparing the weather of September and August, we notice some noteworthy differences. September experiences a broader temperature range, with minimums dropping to 3°C (37°F) and maximums reaching up to 31°C (88°F), giving it an average temperature of 14°C (58°F). In contrast, August has a milder minimum temperature of 6°C (43°F) combined with a higher maximum of 34°C (93°F), resulting in an average temperature of 18°C (65°F).
Precipitation levels in both months are similar, with September receiving 63 mm (2.5 in) over 9 days, while August has a slightly higher rainfall of 65 mm (2.5 in) over 12 days. Interestingly, September's higher humidity at 83% compared to August's 80% adds to the overall moisture in the air. For a closer look at August’s climate specifics, you can visit Trier weather in August.
September and October present notable contrasts in weather patterns. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 31°C (88°F), with an average of 14°C (58°F). The month experiences a relatively moderate amount of precipitation at 63 mm (2.5 in) across 9 days, accompanied by a humidity level of 83%. In contrast, October sees cooler temperatures, with a minimum of 0°C (32°F), an average of 10°C (51°F), and a maximum of 24°C (76°F). Precipitation increases slightly to 78 mm (3.1 in) over 13 days, while humidity rises to 89%. For more detailed insights, check out Trier weather in October.
September and November present contrasting weather patterns. In September, temperatures can range from a mild 3°C (37°F) at night to a warm 31°C (88°F) during the day, with an average temperature of 14°C (58°F). The month experiences around 63 mm (2.5 in) of rainfall over approximately 9 days, accompanied by a relatively lower humidity of 83%. In contrast, November sees much cooler temperatures, with a minimum of -4°C (25°F) and an average of just 5°C (42°F), reaching a maximum of 19°C (67°F). Precipitation increases slightly to 71 mm (2.8 in) across about 12 days, and the humidity rises to 91%. For a detailed look at November's weather, check the following link: Trier weather in November.
In September, temperatures vary widely, with minimums around 3°C (37°F) and maximums reaching up to 31°C (88°F), making it a generally warmer month with an average of 14°C (58°F). Precipitation is moderate at 63 mm (2.5 in) over about 9 days, and humidity is relatively high at 83%. In contrast, December brings much cooler conditions, with temperatures dropping significantly; the minimum can plummet to -5°C (22°F) while the average sits at just 3°C (38°F) and a maximum of 14°C (57°F). Additionally, December sees increased precipitation at 135 mm (5.3 in) spread over 20 days and even higher humidity at 93%. This shift represents a stark transition from the mild and variable weather of September to the colder and wetter conditions of December. For more details, check out Trier weather in December.
As September unfolds in Trier, the weather offers a delightful transition from the heat of summer to the cool embrace of autumn. While daytime temperatures can soar to a warm 31°C, the nights bring a refreshing drop, characteristic of early fall. This month sees a moderate amount of rainfall, with precipitation occurring on about nine days, leading to a humid atmosphere that can feel heavier than in the summer months. Overall, September balances warm afternoons with crisp evenings, creating a unique and inviting climate that sets the stage for the changing seasons ahead. For more insights on what to expect, explore our comprehensive guide on Trier Climate.