Last updated: March 24, 2025
September in Bormio, Italy, showcases a transition as summer wanes, with daytime temperatures peaking at a pleasant 18°C (65°F) and a cooler average of 7°C (44°F). The nights can be chilly, dipping to a brisk -13°C (8°F), urging visitors to pack accordingly. This month brings a notable 98 mm (3.9 in) of rainfall, distributed over approximately 14 days, leading to a humid environment with an average humidity level of 83%. Whether you’re exploring the stunning alpine landscapes or savoring local cuisine, September’s varied weather offers a unique charm for travelers in this picturesque mountain town.
In September, Bormio begins to transition from the warm embrace of summer into the crispness of autumn. The temperatures reflect this shift, with minimums dipping to -13°C (8°F) and averaging 7°C (44°F) during the month. Daytime highs reach a comfortable 18°C (65°F), providing a pleasant contrast to the chilly mornings and evenings. Overall, the velocity of the temperature decline becomes evident, setting the stage for the colder months ahead while still offering the beautiful scenery of the mountains amidst the fall colors. As summer vacations fade, September invites visitors to experience the serene beauty of Bormio in a more tranquil setting.
September in Bormio, Italy, brings a refreshing shift in precipitation patterns as the summer heat begins to wane. With 98 mm (3.9 in) of rainfall spread over 14 days, this month showcases a moderate level of wet weather, offering a balance between sunny spells and the onset of autumnal showers. Notably, the precipitation levels for September are slightly lower than the record highs of August, which saw 131 mm (5.1 in) over 19 days. This trend signals a gradual transition as the region experiences less frequent but more substantial rainfall compared to the vibrant summer months. As the days grow shorter and cooler, September’s rainfall contributes to the lush landscapes, making it an enchanting time to explore the natural beauty of the Alps.
In Bormio, Italy, September marks a transition in humidity as summer fades into autumn. The average humidity settles at 83%, a slight rise from the previous months but still moderately comfortable. As the year progresses, a clear trend emerges: humidity levels peak during the winter months, reaching 90% in both October and December. This pattern signifies Bormio's alpine climate, where late summer's warmth gradually gives way to the crisp, moist air of fall, setting the stage for the snowy winters ahead. The lingering summer humidity serves as a gentle reminder of the season passed, making September a unique bridge between the vibrant warmth of summer and the serene chill of winter.
As summer transitions into early autumn, September in Bormio, Italy maintains a very high UV Index of 8, allowing for a brief yet enjoyable outdoor experience with a burn time of just 15 minutes. This decline from the extreme levels of July and August signals a slight easing in sun intensity, offering a gentle reminder to still take precautions. Observing the trend, we see the UV Index steadily decreases from its peak earlier in the year—starting at a low 2 in January and climbing to a maximum of 11 in June and July. September's UV levels highlight the changing seasons, inviting residents and visitors alike to embrace the beautiful fall landscape while remaining vigilant about sun exposure. For more detailed information, consult the Bormio UV Index.
UV Risk Categories
In September, Bormio, Italy, basks in a delightful 317 hours of sunshine, a warm embrace as summer gracefully transitions into autumn. This month continues the trend of abundant daylight seen throughout the summer, though it marks a notable dip from the peak sunshine of July's 412 hours. As the days grow shorter, September retains a vibrant glow, offering a perfect backdrop for outdoor adventures and breathtaking scenery. The gradual decline in sunlight through the autumn months highlights nature's enchanting shifts, inviting visitors to relish the stunning landscapes set aglow by the soft golden hues of early fall.
In September, Bormio, Italy, experiences a moderate 31% chance of sunny weather, which marks a slight decline from the preceding months of summer but aligns closely with the trend seen in May and June. As the vibrant colors of autumn begin to emerge, the probability of clear skies contrasts with the high temperatures of July and August, where the likelihood peaked at 33% and 38%, respectively. This seasonal transition suggests that while September may not guarantee a sun-soaked stay, the potential for enjoyable, mild weather remains, inviting visitors to explore the stunning alpine landscapes amidst the changing foliage.
As summer gracefully transitions to autumn, September brings a notable shift in daylight duration in Bormio, Italy. Following the sun-drenched months of June through August, which bask in a consistent 15 hours of light, September sees a reduction to a more moderate 12 hours. This decline signals the onset of fall, where the days are still pleasantly long, yet they start to hint at the cooler, shorter days ahead. The rhythm of daylight in Bormio follows a clear pattern, as it gradually diminishes from the peak of summer, through October and into the depths of winter, when daylight shrinks to just 8 hours in December. Each month paints a unique picture of the changing seasons, inviting visitors to experience the beauty of Bormio in this transitional phase.
As September rolls into Bormio, Italy, the landscape begins to experience a subtle yet noticeable shift in the winds. With an average wind speed of 1.1 m/s (3 mph), the breezes become gentler, marking a transition from the lively winds of summer. This slight decline from August's average of 1.4 m/s adds to the serene atmosphere of early autumn. The calm winds invite contemplative strolls through the charming alpine town, where the vibrant hues of fall foliage start to paint the scenery. As nature prepares for the chillier months ahead, the mellow September winds carry with them a promise of the seasonal change, harmonizing with the tranquil rhythms of life in the mountains.
The weather in Bormio 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 Bormio and find detailed weather information for every month.
September and January present stark contrasts in weather. In September, temperatures range from a chilly -13°C (8°F) at night to a mild 18°C (65°F) during the day, with an average of 7°C (44°F). This month experiences about 98 mm (3.9 in) of precipitation over 14 days, with humidity levels at 83%. In stark contrast, January sees much colder temperatures, with a minimum of -30°C (-21°F), an average of -11°C (12°F), and a maximum of 1°C (34°F). Precipitation is lower at 60 mm (2.4 in) spread over only 9 days, but it also has higher humidity at 93%. For more details on January weather, you can check Bormio weather in January.
In September, Bormio experiences milder temperatures, with averages around 7°C (44°F) and maximums reaching 18°C (65°F), making it a more comfortable time for outdoor activities. The month sees a fair amount of precipitation, totaling 98 mm (3.9 in) over 14 days, contributing to a humidity level of 83%. In contrast, February is much colder, with average temperatures plummeting to -8°C (18°F) and maximums only hitting 5°C (41°F). The colder month also has less precipitation, totaling 48 mm (1.9 in) over 9 days, but the humidity climbs slightly to 89%. For more detailed information on February weather in Bormio, you can visit Bormio weather in February.
In comparing the weather between September and March, we see a significant shift in temperature and conditions. September experiences milder temperatures with a minimum of -13°C (8°F) and an average of 7°C (44°F), peaking at a comfortable 18°C (65°F). This month also records 98 mm (3.9 in) of precipitation over 14 days, combined with a humidity level of 83%. In contrast, March is much colder, with temperatures dropping to a minimum of -24°C (-11°F) and an average of -5°C (22°F), while reaching a maximum of only 10°C (50°F). March also sees a lower precipitation total of 66 mm (2.6 in) over 11 days, with slightly higher humidity at 86%. For more specific details on March weather, check out Bormio weather in March.
When comparing the weather in September and April, we see notable differences in temperature and precipitation. September experiences a milder temperature range, with averages hovering around 7°C (44°F) and a maximum of 18°C (65°F), while April tends to be colder, with averages around -1°C (31°F) and a maximum of only 12°C (54°F). Precipitation is more prominent in September, totaling 98 mm (3.9 in) over 14 days, compared to April's 74 mm (2.9 in) across 11 days. Despite these differences, both months share a consistent humidity level of 83%. For more detailed information about the weather in April, check out Bormio weather in April.
In comparing the weather of September and May, we find that both months experience similar maximum temperatures, peaking at around 18°C (65°F) in September and 18°C (64°F) in May. However, September tends to be slightly warmer on average, with a mean temperature of 7°C (44°F), compared to May's average of 3°C (39°F). Precipitation levels are also noteworthy; May sees a higher amount of rainfall at 121 mm (4.8 in) over 21 days, while September has 98 mm (3.9 in) across 14 days. Humidity in September is higher at 83%, as opposed to 78% in May, indicating a more humid feel during the early fall. For more detailed weather information about May, you can visit Bormio weather in May.
September and June show notable differences in weather patterns. In September, temperatures range from a minimum of -13°C (8°F) to a maximum of 18°C (65°F), with an average of 7°C (44°F), while June offers milder conditions with temperatures between -3°C (26°F) and 24°C (75°F), averaging at 9°C (49°F). Although both months experience significant precipitation, September records 98 mm (3.9 in) over 14 days, which slightly decreases in June with 102 mm (4.0 in) spread across 17 days. Humidity levels are slightly higher in September at 83%, compared to 79% in June. For a more detailed look at June weather specifics, check out Bormio weather in June.
September weather in Bormio is notably cooler than July, with average temperatures ranging from a minimum of -13°C (8°F) to a maximum of 18°C (65°F), compared to July's milder range of 0°C (33°F) to 23°C (74°F). Precipitation is also frequent, with September experiencing 98 mm (3.9 in) over 14 days, while July sees slightly more rain—108 mm (4.3 in)—over a longer period of 20 days. Humidity levels remain quite similar in both months, with September at 83% and July at 82%. For more details, you can check out Bormio weather in July.
In comparing the weather of September and August, September shows a notable drop in temperatures, with minimums reaching as low as -13°C (8°F) and an average temperature of 7°C (44°F). In contrast, August offers milder conditions, featuring minimum temperatures of 0°C (33°F) and an average of 11°C (51°F). Rainfall is also a key distinction; September receives 98 mm (3.9 in) over 14 days, while August has higher precipitation at 131 mm (5.1 in) across 19 days. Despite slightly higher humidity levels in September at 83%, August remains relatively humid at 80%. For more detailed insights on August weather, you can explore Bormio weather in August.
In September, the weather begins to cool, with temperatures ranging from a minimum of -13°C (8°F) to a maximum of 18°C (65°F) and an average of 7°C (44°F). The month sees a fair amount of rain, with 98 mm (3.9 in) of precipitation over 14 days, while the humidity hovers around 83%. As October arrives, temperatures drop slightly further, with a minimum of -14°C (8°F), an average of 2°C (36°F), and a maximum of 14°C (58°F). Precipitation increases to 114 mm (4.5 in) but occurs on fewer days, just 9 in total, and humidity rises to 90%. For more details, check out Bormio weather in October.
September and November present contrasting weather conditions. In September, temperatures range from a chilly -13°C (8°F) at their lowest to a mild max of 18°C (65°F), with an average of 7°C (44°F). The month experiences 98 mm (3.9 in) of precipitation over approximately 14 days and maintains a humidity level of 83%. In stark contrast, November sees much colder temperatures, with a minimum of -24°C (-10°F) and an average of -4°C (24°F), peaking at just 9°C (48°F). This month is also wetter, with 120 mm (4.7 in) of precipitation spread over 12 days, and a higher humidity of 89%. For more detailed information about November's weather, you can visit Bormio weather in November.
September and December present quite contrasting weather conditions. In September, temperatures range from a chilly -13°C (8°F) at their lowest to a mild 18°C (65°F) at their peak, with an average of around 7°C (44°F). The month experiences considerable precipitation, accumulating 98 mm (3.9 in) over about 14 rainy days, accompanied by a relatively high humidity of 83%.
In contrast, December brings much harsher temperatures, with a minimum of -28°C (-18°F) and a maximum of only 2°C (36°F), resulting in an average of -10°C (15°F). Although December sees slightly more precipitation at 109 mm (4.3 in) over the same number of rainy days, the humidity rises to 90%, indicating a colder and wetter atmosphere. For a detailed look at what to expect, check out Bormio weather in December.
As summer gives way to autumn, September in Bormio presents a distinct shift in weather patterns compared to the warmer months. Temperatures begin to cool, with pleasant days followed by crisp nights, making it a perfect time for those who appreciate the transition to fall. Although precipitation does increase during this month, with frequent rainy days, the high humidity adds a unique touch to the alpine air. This transformation creates a vibrant atmosphere, ideal for outdoor activities against a backdrop of changing foliage. For more details on what you can expect, check out the comprehensive guide on Bormio Climate.