Last updated: March 24, 2025
In September, Stelvio, Italy, experiences a vibrant shift in weather as summer gives way to autumn. With maximum temperatures reaching 18°C (64°F) and an average of 6°C (43°F), the crisp air is refreshing yet cool, while temperatures can plummet to a minimum of -13°C (9°F) during the night. Rainfall is notable with a total of 92 mm (3.6 in) spread across 13 days, contributing to the region's lush landscapes. The humidity level peaks at 83%, adding a touch of moisture to the air that enhances the vivid colors of the fall foliage, making September a picturesque time to explore this enchanting alpine destination.
In September, Stelvio experiences a notable transition as summer gives way to the early whispers of autumn. The temperatures range from a chilly -13°C (9°F) at night to a pleasant 18°C (64°F) during the day, with an average of 6°C (43°F). This gradual drop mirrors the shift from the warmer months, as locals and visitors alike embrace the crisp air and the vibrant colors of the landscape. While the maximum temperatures have cooled from the warm highs of summer, the September climate offers a refreshing escape, inviting outdoor adventures amidst the stunning alpine scenery. As the season progresses, the chilly nights remind us that winter is just around the corner, making September a unique blend of warmth and the promise of cooler days ahead.
In September, Stelvio experiences a notable shift in precipitation patterns, marking the transition into autumn. This month sees around 92 mm (3.6 in) of rain, falling over 13 days, which is a significant drop from the preceding summer months. While August recorded 101 mm over 15 days, September's rainfall signals a gradual reduction in both intensity and frequency, hinting at the cooler months ahead. As the landscape transforms with autumn's arrival, this month balances the lingering warmth of summer with the fresh, rejuvenating showers that prepare the region for the winter season. Overall, September's precipitation serves as a reminder of the dynamic climatic shifts in Stelvio.
September in Stelvio, Italy, brings a slight uptick in humidity, averaging 83%, which aligns with the gradual transition into autumn. This month sees a modest increase from the summer's 80% in August, signaling a shift as the warm days begin to cool down. Overall, the humidity levels in September remain comfortably balanced within the broader trend observed throughout the year, where winter months like January and October spike at 93% and 90%, respectively. By contrast, the peak of summer in July and August tends to hover around the high 80s. This fluctuation illustrates Stelvio’s climate, where a lush, humid environment prevails amidst changing seasons, offering a refreshing embrace before the onset of colder months.
As September rolls into Stelvio, Italy, the UV Index remains robust at 8, placing it in the very high exposure category. With a burn time of just 15 minutes, there’s a clear continuation of summer's intensity, though it’s a slight dip from August's peak UV Index of 9. This trend indicates that while the sun is beginning to soften with the arrival of autumn, visitors and locals alike should still take precautions against potential skin damage. Compared to the earlier months of the year, where the UV Index ranged from 2 in January to a striking 11 in both June and July, September’s levels reflect the lingering warmth and high elevation of this beautiful region. For more detailed information on UV exposure, check out Stelvio UV Index.
UV Risk Categories
September in Stelvio, Italy, marks a gentle transition from the vibrant summer days to the crisp embrace of autumn. With 317 hours of sunshine, this month retains a warm glow, lingering just below the peak summer months of July and June. While summer's brilliance captivates visitors with its highest sunshine totals, September still shines brightly compared to the cooler months that follow. As daylight begins its gradual retreat towards winter, the tapestry of yellows and reds in the surrounding landscape comes to life under the tail end of the sunshine, enchanting those who experience this picturesque setting. This month embodies a beautiful balance, where the warmth of summer lingers just a little longer, inviting all to savor the last embrace of sunlight before the chilly air of October sets in.
In Stelvio, Italy, the chances of enjoying sunny days in September stand at 33%, reflecting a subtle shift in weather patterns as summer transitions to autumn. This month mirrors the sunniest periods of the preceding months, particularly July and August, which boast a slightly higher likelihood of clear skies. While September offers a moderate chance of sunshine compared to the earlier months, it does feel a bit dimmer than October, which experiences a jump to 43%. Despite this, September still presents a wonderful opportunity to savor the majestic landscapes of Stelvio, where the crisp air and changing leaves create a picturesque backdrop, enhancing any outdoor adventure.
As September arrives in Stelvio, Italy, daylight begins its gentle decline from the summer's peak. With 12 hours of daylight, the month marks a transition, showcasing a noticeable shift from the 15 hours enjoyed in the height of June through August. This gradual shortening reflects the changing seasons, as the vibrant hues of autumn start to emerge. As the days grow shorter, the landscapes transform, inviting locals and visitors alike to bask in the softer light, embrace the cool air, and prepare for the cozy months ahead. This rhythmic ebb and flow of daylight not only signals the seasonal change but also enriches the charm of Stelvio as it moves from the warmth of summer into the embrace of fall.
As summer transitions into autumn, September in Stelvio, Italy, brings a gentle whisper of wind, with average speeds dipping to 1.0 m/s (2 mph). This marks the year's lowest wind velocity, showcasing a trend of diminishing breezes as the cooler months approach. Interestingly, throughout the year, wind speeds tend to hover around 1.3 to 1.5 m/s, peaking in January and December with a consistent 3 mph. As the seasons shift, the serene stillness of September offers a tranquil backdrop for enjoying the breathtaking alpine scenery, inviting visitors to embrace the calm before the winter winds return.
The weather in Stelvio 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 Stelvio and find detailed weather information for every month.
September and January present starkly contrasting weather conditions. In September, temperatures range from a chilly -13°C (9°F) to a mild 18°C (64°F), with an average of 6°C (43°F). The month experiences 92 mm (3.6 in) of precipitation over 13 days, while humidity levels hover around 83%. In contrast, January is significantly colder, with temperatures dropping to a minimum of -29°C (-20°F) and reaching a maximum of 0°C (32°F), resulting in an average temperature of -12°C (11°F). The precipitation in January is lower at 52 mm (2.0 in) over 9 days, and humidity rises slightly to 93%. For a detailed look at January weather specifics, you can visit Stelvio weather in January.
September and February present two contrasting weather patterns. In September, temperatures range from a chilly minimum of -13°C (9°F) to a mild maximum of 18°C (64°F), with an average of 6°C (43°F). The month sees about 92 mm (3.6 inches) of precipitation over 13 days, with humidity around 83%. In contrast, February experiences significantly colder temperatures, with a minimum of -29°C (-20°F) and a maximum of just 4°C (40°F), averaging -9°C (17°F). Precipitation drops to 44 mm (1.7 inches) across 8 days, while humidity slightly increases to 89%. For more detailed information about February weather, you can visit Stelvio weather in February.
In comparing the weather of September and March, September tends to be milder with temperatures ranging from a minimum of -13°C (9°F) to a maximum of 18°C (64°F) and an average of 6°C (43°F). In addition, it experiences higher levels of precipitation at 92 mm (3.6 in) over 13 days, accompanied by relatively high humidity at 83%. In contrast, March is significantly colder, with temperatures fluctuating between -25°C (-12°F) and 9°C (49°F), averaging -6°C (21°F). Precipitation is lower at 57 mm (2.2 in) over 10 days, while the humidity remains high at 86%. To explore specific weather details for regions like Stelvio, check Stelvio weather in March.
When comparing the weather in September and April, we see notable differences in temperature and precipitation levels. September typically offers milder conditions with average temperatures ranging from a minimum of -13°C (9°F) to a maximum of 18°C (64°F), while April is generally colder, featuring temperatures that range from a low of -19°C (-1°F) to a high of 12°C (54°F). Although April experiences slightly less precipitation at 74 mm (2.9 in) over 10 days compared to September's 92 mm (3.6 in) over 13 days, both months share the same humidity level of 83%. For those interested in more details about the weather in April, you can check this link: Stelvio weather in April.
When comparing September and May weather, September typically offers milder temperatures, with an average of 6°C (43°F) and daytime highs reaching up to 18°C (64°F). In contrast, May tends to be slightly cooler with an average temperature of 3°C (37°F) and maximum temperatures around 17°C (63°F). Precipitation is more frequent in May, occurring on 20 days with a total of 111 mm (4.4 in), compared to September's 13 days of rain and 92 mm (3.6 in) of precipitation. Humidity levels are also noticeable, with September having 83% humidity, while May is slightly lower at 78%. For more detailed insights into May's weather, you can check out Stelvio weather in May.
In comparing the weather between September and June, September presents cooler temperatures, with a minimum of -13°C (9°F) and an average of 6°C (43°F), contrasted with June, where the temperatures are milder, ranging from a minimum of -4°C (25°F) to an average of 9°C (48°F). The maximum temperature in June reaches up to 23°C (74°F), a significant rise compared to September's maximum of 18°C (64°F). While both months experience precipitation—92 mm (3.6 in) over 13 days in September and 103 mm (4.0 in) over 16 days in June—the humidity levels are relatively high in both months, with September at 83% and June slightly lower at 79%. For more detailed insights on June weather, you can explore Stelvio weather in June.
When comparing the weather in September to that of July, it's evident that September experiences cooler temperatures, with averages around 6°C (43°F) compared to July's warmer average of 10°C (51°F). Additionally, September features a wider range of temperatures, with minimums dropping to -13°C (9°F) and maximums reaching only 18°C (64°F), whereas July's minimum is more mild at 0°C (33°F) and maximum can rise to 22°C (72°F). Precipitation is somewhat similar, with September receiving 92 mm (3.6 in) over 13 days, while July records slightly less at 80 mm (3.2 in) spread across 16 days. Humidity levels are comparable, with September at 83% and July slightly lower at 82%. For more specific insights into July's weather, check out Stelvio weather in July.
In August, the weather was generally warmer than in September, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 23°C (73°F) and an average of 10°C (51°F). In contrast, September saw cooler conditions, with temperatures dropping to a minimum of -13°C (9°F) and peaking at 18°C (64°F), averaging 6°C (43°F). While both months experienced significant precipitation—101 mm (4.0 in) in August compared to 92 mm (3.6 in) in September—August had rain on 15 days, slightly more than the 13 days in September. Humidity levels were also similar, with August at 80% and September slightly higher at 83%. For those interested in more detailed weather information, check out Stelvio weather in August.
In September, temperatures range from a minimum of -13°C (9°F) to a maximum of 18°C (64°F), with an average temperature of 6°C (43°F). This month experiences 92 mm (3.6 in) of precipitation over 13 days, while humidity remains relatively high at 83%.
In comparison, October sees slightly colder temperatures, with a minimum of -15°C (4°F) and a maximum of 14°C (57°F), resulting in a lower average of 2°C (35°F). Precipitation increases to 110 mm (4.3 in) over just 10 days, and humidity rises to 90%. This shift makes October noticeably cooler and wetter, creating a more pronounced autumn atmosphere. For more detailed insights, check out Stelvio weather in October.
September and November present notable differences in weather characteristics. In September, temperatures typically range from a minimum of -13°C (9°F) to a maximum of 18°C (64°F), with an average of around 6°C (43°F). The month sees about 92 mm (3.6 in) of precipitation over 13 days, alongside a relatively high humidity of 83%. In contrast, November experiences more frigid conditions, with temperatures dipping to a minimum of -24°C (-12°F) and peaking at just 9°C (48°F), yielding a colder average of -5°C (23°F). Additionally, November receives more precipitation, totaling 120 mm (4.7 in) over 11 days, and an increase in humidity to 89%. For a more detailed overview of November weather in the region, visit Stelvio weather in November.
In September, the weather features a milder temperature range, with minimums around -13°C (9°F) and an average of 6°C (43°F), peaking at a comfortable 18°C (64°F). The month experiences about 92 mm (3.6 in) of precipitation over 13 days, with a humidity level of 83%. In contrast, December brings much colder conditions, with minimum temperatures plummeting to -29°C (-20°F) and an average of -10°C (14°F), while the maximum only reaches 1°C (35°F). The precipitation increases slightly to 103 mm (4.1 in) over 12 days, and humidity rises to 90%. These stark contrasts highlight the transition from a cool autumn to a frigid winter environment, making December significantly harsher. For a deeper look at December’s weather conditions, check out Stelvio weather in December.
As summer transitions into autumn, September in Stelvio offers a distinct shift in weather, setting it apart from the hotter months. Days begin with tantalizing warmth, yet the nights can plunge into chilly lows, creating a delightful contrast that invites both adventure and cozy evenings. With an increased humidity of 83% and a respectable amount of rainfall across approximately half the month, September paints a picture of a lush landscape coming alive with vibrant fall colors. This evolving climate serves as a gentle reminder that while summer's warmth is fading, the breathtaking beauty of nature is just beginning to reveal itself. For a deeper insight into what to expect, check out Stelvio Climate.