Last updated: August 27, 2025
In Winterthur, Switzerland, September ushers in a transition marked by a maximum temperature of 29°C (84°F), offering warm days amidst the encroaching coolness of autumn. The month's average temperature settles at a comfortable 15°C (59°F), while nights can dip as low as 3°C (38°F), reminding residents of the upcoming chilly season. With 84 mm (3.3 in) of rainfall spread over 11 days, September tends to be a wet month, contributing to a humidity level of 83% that envelops the city in a crisp, refreshing atmosphere. This unique blend of warmth and moisture makes September a dynamic time to experience Winterthur's natural beauty.
In September, Winterthur, Switzerland, starts to transition from the cozy warmth of summer to the cool embrace of autumn. With nighttime temperatures dipping to a minimum of 3°C (38°F) and daily highs reaching a pleasant 29°C (84°F), this month offers a delightful balance of warmth and freshness. The average temperature hovers around 15°C (59°F), making it a perfect time for outdoor activities amidst the vibrant fall foliage. As the month progresses, the crispness in the air becomes more palpable, hinting at the cooler days ahead while still allowing for some late-summer warmth to linger. This blend of temperatures reflects a gradual shift in the season, inviting both locals and visitors to enjoy the beauty of Winterthur as it transitions into autumn.
In September, Winterthur experiences a shift towards the mellow hues of autumn, accompanied by 84 mm (3.3 in) of precipitation over 11 days. This marks a slight decrease from the wetter summer months, reflecting a transition as the lush greenery begins to fade. Following the higher rainfall of August, which saw 114 mm (4.5 in), September's precipitation indicates a more moderate climate, balancing the lingering warmth with an inviting coolness. As the year progresses into October, the trend of decreased rainfall continues, suggesting a calming in the weather patterns as winter approaches.
As autumn approaches, September in Winterthur, Switzerland, experiences a moderate humidity level of around 83%. This marks a slight increase from the summer months, where humidity hovered between 80% and 83% in July and August. The transition into fall can be seen as humidity begins to rise once more, hinting at the impending dampness that characterizes the winter months. Indeed, as the year progresses, an upward trend emerges, with humidity levels reaching their peak in January and October at 90%. This gradual shift serves as a reminder of the region's cooler climate, making September a month of comfortable yet humid weather, perfectly setting the stage for the wetter months ahead.
In September, Winterthur experiences a UV Index of 6, placing it in the high exposure category. This means sun seekers should be mindful of skin protection, as the burn time drops to approximately 25 minutes. As summer transitions to fall, the UV levels remain relatively elevated compared to earlier months like July and August, when the index peaked at 9. Interestingly, while September marks a decline in UV intensity, it still demands caution, contrasting with the lower indices of the winter months ahead. To stay informed about UV levels throughout the year, explore more on the Winterthur UV Index.
UV Risk Categories
In Winterthur, Switzerland, September marks a delightful transition as summer begins to wane, yet the city still basks in a generous 316 hours of sunshine. This period stands as a radiant conclusion to the long, sun-soaked days of July and August, which boast 406 and 375 hours, respectively. As temperatures begin to cool and nature dons its autumn attire, September’s sunshine is notably less than the summer peak but far more abundant than the dim light of the winter months that follow, dipping to 266 hours in October and further down to 195 hours by November. The gradual decline in sunlight hours encapsulates the serene shift into fall, making every sunbeam in September feel like a cherished gift before the crisp embrace of winter settles in.
In Winterthur, Switzerland, September boasts a 45% chance of sunny weather, positioning it as one of the more favorable months for sunshine as summer transitions into autumn. This likelihood is on par with the sunnier months of March and April, both showing similar percentages, suggesting that late summer and early autumn share the potential for pleasant days. Interestingly, while the chance of sun dips in May and summer months like June, July, and August, September emerges as a notable time to enjoy mild temperatures under clear skies. As the year progresses into October, the chances of sun decline again, emphasizing September's role as a brief yet vibrant window for sun seekers in Winterthur.
As summer transitions into autumn, September in Winterthur, Switzerland offers a pleasant balance with 12 hours of daylight. This marks a gradual decline from the sun-soaked months of June, July, and August, each blessed with 15 hours of bright sunshine. Following the warmth of summer, September ushers in shorter days, but still retains more light than the chillier months ahead. From October's 10 hours to the winter low of 8 hours in January, it's clear that Winterthur's daylight duration follows a rhythmic cycle, highlighting a vibrant shift from the lively summer days to the tranquil evenings of winter. The gradual decrease in daylight serves as a gentle reminder of the changing seasons, inviting scenic autumn strolls beneath the fading sun.
As September gracefully ushers in the autumn chill in Winterthur, Switzerland, the average wind speed dips to 1.7 m/s (4 mph), marking a continuation of the gentle breezes characteristic of late summer. This slight decrease is part of a broader trend observed throughout the warmer months, where wind speeds notably peaked in May at 2.8 m/s (6 mph). Following this peak, the notable lull in wind speed throughout June, July, and August suggests a tranquil summer atmosphere, which, as September arrives, carries the promise of fall. With October showing a modest recovery to 1.8 m/s (4 mph), the winds in Winterthur reflect the season's transition, hinting at the coming changes while remaining gentle and unassuming. The steady cycle of wind patterns underscores the serene charm of the region's seasonal shifts.
Weather in Winterthur varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Winterthur, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather tends to be milder, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F) and an average of 15°C (59°F). This month experiences about 84 mm (3.3 inches) of precipitation over 11 days, accompanied by a humidity level of 83%. In contrast, January brings much colder temperatures, with a minimum of -13°C (9°F), an average of just 1°C (34°F), and a maximum of 15°C (60°F). January also sees slightly higher precipitation at 97 mm (3.8 inches) over the same number of days (11), but with increased humidity of 92%. For more details on the January weather in Winterthur, you can visit Winterthur weather in January.
September and February present stark contrasts in weather patterns. In September, temperatures range from a mild 3°C (38°F) at night to a warm 29°C (84°F) during the day, averaging around 15°C (59°F). Humidity levels are relatively high at 83%, and the month receives about 84 mm (3.3 in) of precipitation over 11 days.
In contrast, February is much colder, with nighttime lows plunging to -12°C (10°F) and daytime highs reaching only 18°C (65°F), averaging just 3°C (38°F). The humidity in February is slightly higher at 89%, but the total precipitation is a bit less at 75 mm (3.0 in), occurring over 12 days. For more detailed insights into the February climate, you can check Winterthur weather in February.
When comparing the weather in September to that of March, we observe notable differences in temperature and conditions. September tends to be warmer, with average temperatures ranging from a cool 15°C (59°F) to a high of 29°C (84°F), while March averages much lower, with temperatures spanning from a frigid -12°C (11°F) to a maximum of 20°C (69°F). Both months experience similar levels of precipitation, with September receiving 84 mm (3.3 in) over 11 days and March slightly higher at 86 mm (3.4 in) over 14 days. Additionally, humidity levels are relatively high in both months, with September at 83% and March at 87%. For more detailed information on March weather, you can check Winterthur weather in March.
In comparing the weather of September and April, September tends to be warmer, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F), averaging around 15°C (59°F). It experiences more precipitation, with 84 mm (3.3 in) falling over approximately 11 days, while maintaining a humidity level of 83%. In contrast, April is cooler, with temperatures ranging from a minimum of -4°C (25°F) to a maximum of 26°C (79°F) and an average of 10°C (50°F). It also has slightly less rainfall, totaling 63 mm (2.5 in) over about 9 days and a similar humidity of 84%. For more details on April weather specifics, you can visit Winterthur weather in April.
September and May present distinct weather characteristics. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 29°C (84°F), with an average of 15°C (59°F). The month typically sees 11 days of precipitation, totaling 84 mm (3.3 in), along with a humidity level of 83%. In contrast, May experiences slightly cooler temperatures, with a minimum of -2°C (28°F) and a maximum reaching up to 30°C (87°F), averaging 13°C (56°F). May is also wetter, with 123 mm (4.9 in) of rainfall over 17 days, and a humidity level of 80%. For more information on May weather, you can visit Winterthur weather in May.
When comparing the weather in June and September, we can see distinct differences. June tends to be warmer overall, with average temperatures reaching 18°C (65°F) and highs of 33°C (92°F), while September shows a cooler average of 15°C (59°F), with maximums of 29°C (84°F). Both months experience considerable rainfall, but June is slightly wetter, with 138 mm (5.4 in) of precipitation over 14 days compared to September’s 84 mm (3.3 in) over 11 days. Interestingly, the humidity is slightly lower in June at 82%, while September remains high at 83%. For a deeper dive into the specifics, check out Winterthur weather in June.
In comparing the weather between September and July, September tends to be cooler, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F), and an average of 15°C (59°F). In contrast, July records warmer temperatures, with a minimum of 8°C (47°F) and a maximum of 36°C (96°F), averaging around 20°C (68°F). Precipitation is slightly higher in July at 92 mm (3.6 in) over 14 days, compared to 84 mm (3.3 in) over 11 days in September, though both months exhibit a consistent humidity level of 83%. For a more detailed look at July weather, you can visit Winterthur weather in July.
In comparing the weather of September to August, we see a notable shift in temperatures and precipitation patterns. September experiences cooler temperatures, with minimums dropping to 3°C (38°F) and average highs of 29°C (84°F), compared to August's milder minimum of 8°C (46°F) and maximums reaching up to 35°C (95°F). Additionally, September has slightly less precipitation at 84 mm (3.3 in) over 11 days, whereas August recorded 114 mm (4.5 in) over 12 days, indicating a drier month as summer transitions into fall. Humidity levels remain relatively similar, with September at 83% and August at 80%. For a more detailed look at August weather, you can check Winterthur weather in August.
September typically showcases a warmer climate, with temperatures averaging around 15°C (59°F) and highs reaching up to 29°C (84°F). With 11 days of precipitation totaling 84 mm (3.3 in), the month is relatively mild, although humidity is high at 83%. In contrast, October brings cooler temperatures, with an average of 10°C (51°F) and a maximum of 23°C (73°F), while dipping down to a chilly minimum of -1°C (31°F). The precipitation slightly increases to 94 mm (3.7 in) over 12 days, accompanied by an uptick in humidity at 90%. For more specific details about October weather, you can check Winterthur weather in October.
In September, the weather is generally mild, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F) and an average of 15°C (59°F). The month experiences about 84 mm (3.3 in) of precipitation over 11 days, coupled with a humidity level of 83%. In contrast, November brings much cooler conditions, with temperatures dipping to a minimum of -3°C (26°F) and an average of 5°C (41°F). The maximum temperature does not exceed 20°C (69°F), and monthly precipitation decreases to 62 mm (2.5 in), also over 11 days. Humidity is slightly higher at 88%, contributing to the chill in the air. For detailed insights into the weather experienced in this month, you can visit Winterthur weather in November.
September weather is characterized by a mild range of temperatures, with lows around 3°C (38°F) and an average of 15°C (59°F), reaching a maximum of 29°C (84°F) on warmer days. The month sees about 84 mm (3.3 in) of precipitation over 11 days, along with a relative humidity of 83%, making it a pleasant yet somewhat humid month.
In contrast, December brings much colder conditions, with temperatures dropping to a minimum of -8°C (19°F) and averaging around 3°C (37°F). The maximum temperature is significantly cooler at 14°C (57°F). December is also wetter, with precipitation reaching 121 mm (4.8 in) spread over 18 days, and the humidity rises to 90%. For a closer look at what to expect during this winter month, check out Winterthur weather in December.
As September rolls into Winterthur, the weather begins to shift from the height of summer to the cooler embrace of autumn. With temperatures averaging a mild 15°C, this month is marked by more variability than the summer months, leading to refreshing days and chilly nights. Unlike the hotter summer, September sees increased humidity at 83% and significant rainfall, with about 11 days of precipitation accumulating to 84 mm. This transitional period brings a unique charm, as vibrant foliage starts to appear against a backdrop of fluctuating temperatures and overcast skies. For those looking to experience the distinct seasonal shift in Winterthur, September offers a captivating blend of warmth and crispness, setting the stage for the cooler months ahead. Discover more about the climate nuances of this enchanting region at Winterthur Climate.