Last updated: August 25, 2025
September in Andorra la Vella is characterized by mild temperatures, with maximums reaching 23°C (74°F) and averages around 11°C (52°F), while cooler nights may dip to a minimum of -3°C (27°F). The month sees a moderate precipitation total of 70 mm (2.8 in), occurring over approximately 12 days, contributing to a humid atmosphere with an average humidity of 73%. This blend of conditions creates a delightful backdrop for autumn activities, with the landscape transitioning into rich hues as summer gives way to fall.
In September, Andorra la Vella experiences a delightful transition from the warmth of summer to the crispness of autumn. With temperatures ranging from a chilly -3°C (27°F) at night to a comfortable 23°C (74°F) during the day, the month boasts an average of 11°C (52°F), making it an ideal time for outdoor adventures. This shift marks a noteworthy trend as the temperatures begin to cool significantly from the warmer months of July and August, where highs reached into the upper 20s. The scenic landscapes become even more vibrant, inviting visitors to enjoy the breathtaking views while experiencing the changing colors of the season in this enchanting mountain enclave.
September in Andorra la Vella sees a moderate precipitation of 70 mm (2.8 in) over about 12 days, marking a slight decrease from the heavier summer months of June and July. This transition into autumn typically features a balance between sunny days and occasional rainfall, setting the stage for the colorful foliage that characterizes the region. Following a peak in precipitation during May, which averages 111 mm (4.4 in), the weather begins to stabilize, showcasing the dynamic shift from lush, verdant landscapes to the crispness of fall. Overall, September serves as a bridge, blending the warmth of summer with the cool embrace of autumn, making it an intriguing time of year for both locals and visitors.
September in Andorra la Vella marks a subtle shift in humidity, with levels resting at a comfortable 73%. This month continues the trend of decreasing humidity that begins in late spring, reaching its lowest in August at 70%. As autumn approaches, the air becomes slightly more humid, preparing for the wetter months ahead. Notably, this transition indicates a return to higher humidity levels, peaking once again in the chillier months of October (82%) and December (88%). Overall, September represents a gentle balance between summer's drier breath and the forthcoming autumn rains, making it an inviting time for both locals and visitors to experience the beauty of the season.
In September, Andorra la Vella experiences a UV Index of 8, maintaining its status in the very high exposure category. This reflects a gradual decline from the peak summer months of June and July, where the index soared to 11—notably the highest of the year, requiring just 10 minutes for skin to begin burning. As the season shifts, the burn time comfortably extends to 15 minutes in September, yet caution is still advised for outdoor activities. This month serves as a reminder of the lingering summer rays, especially following the extreme levels of August. As autumn approaches, the UV Index is set to decrease further, hinting at the coming lower exposure periods. For a more detailed look at UV levels throughout the year, visit Andorra la Vella UV Index.
UV Risk Categories
September in Andorra la Vella brings a delightful transition from the summer's peak sunshine to the mild warmth of autumn, offering 343 hours of brilliant sunlight. This month marks a slight dip from the vibrant July and August, which bask in over 400 hours of sunshine, yet still retains a generous amount of light compared to the winter months ahead. As the days grow shorter, September's sunshine invites visitors to explore the town's stunning landscapes and enjoy outdoor activities, all while enjoying the lingering warmth of late summer. With a consistent trend of abundant sunlight peaking in summer, Andorra la Vella gently shifts into fall, making September a wonderful time to soak in the remaining sunny days.
In September, the likelihood of sunny weather in Andorra la Vella takes a notable dip, with only a 21% chance of sunshine. This decline follows the peak summer months of July and August, where the sun shines brightly 45% and 46% of the time, respectively. As autumn approaches, the transition is evident; the days begin to cool and clouds become more frequent, leading to a significant drop in sunlight compared to the vibrant summer. With a fluctuating pattern throughout the year, September marks a shift towards more varied weather, contrasting sharply with the sun-soaked summer days that precede it.
In Andorra la Vella, the September days begin to shorten, offering around 12 hours of daylight. This marks a subtle yet significant transition from the summer months, where July and August bask in 14 and 13 hours of sunlight, respectively. As the year progresses from the peak of June with its impressive 15 hours of daylight, September embraces a more balanced rhythm, leading us gently into the autumn. This gradual descent into shorter days mirrors the natural rhythms of the changing seasons, enhancing the charm of the region as it prepares for the cozy embrace of fall.
As the leaves begin to turn in September, the wind in Andorra la Vella takes on a whispering quality, with an average speed of just 1.4 m/s (3 mph). This gentle breeze reflects a noticeable trend as the summer months close out; the wind consistently decreases from the warmer months, reaching its lowest point here before slightly rebounding in October. Unlike the brisker winds of earlier months, September’s airy caress carries the essence of transition, bringing a serene ambiance to the capital. As autumn settles in, locals and visitors alike can enjoy the tranquil charm that this subtle shift in wind brings to the landscape.
Weather in Andorra la Vella varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Andorra la Vella, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather in Andorra la Vella is noticeably milder, with average temperatures ranging from a min of -3°C (27°F) to a max of 23°C (74°F), and a comfortable humidity level of 73%. This month also experiences approximately 70 mm (2.8 in) of precipitation over about 12 days, making it a relatively wet period as summer transitions into autumn. In contrast, January brings much colder conditions, with temperatures plummeting to a minimum of -20°C (-3°F) and an average of -3°C (28°F), while the maximum only reaches 10°C (51°F). The humidity increases to 87%, accompanied by about 76 mm (3.0 in) of precipitation spread over 9 days. For more details on January weather specifics, check out Andorra la Vella weather in January.
In September, temperatures in Andorra la Vella range from a chilly -3°C (27°F) at night to a pleasant 23°C (74°F) during the day, with an average of 11°C (52°F). The month experiences around 70 mm (2.8 in) of precipitation over approximately 12 days, accompanied by a relative humidity of 73%. In contrast, February presents a much colder climate, with minimum temperatures dropping to -15°C (5°F) and a daytime maximum of only 12°C (55°F), resulting in an average temperature of 0°C (33°F). This month sees slightly less precipitation at 60 mm (2.4 in) over 10 days but has a higher humidity level at 83%. For more detailed information, you can check Andorra la Vella weather in February.
When comparing the weather in September and March, September typically offers milder conditions with average temperatures ranging from a minimum of -3°C (27°F) to a maximum of 23°C (74°F). In contrast, March experiences colder weather, with temperatures ranging from a low of -11°C (12°F) to a high of 15°C (59°F). Precipitation levels are fairly similar, with September receiving 70 mm (2.8 in) over 12 days and March slightly wetter at 87 mm (3.4 in) over 14 days. Additionally, March has a higher humidity level at 80% compared to September’s 73%. For more specific insights on March weather, you can check Andorra la Vella weather in March.
When comparing the weather in September and April, notable differences emerge. September typically offers milder temperatures, ranging from a minimum of -3°C (27°F) to a maximum of 23°C (74°F), with an average of 11°C (52°F). In contrast, April experiences cooler conditions, with temperatures plummeting as low as -12°C (10°F) and peaking at 15°C (59°F), averaging just 3°C (38°F). Additionally, April sees slightly higher precipitation levels at 93 mm (3.7 in) over 13 days, compared to September's 70 mm (2.8 in) across 12 days. Humidity levels are also a bit elevated in April at 77%, compared to September's 73%. For more detailed insights about April's weather, check out Andorra la Vella weather in April.
When comparing the weather in September and May, September generally offers milder temperatures, with an average of 11°C (52°F) compared to May's cooler average of 8°C (46°F). Although both months experience significant humidity, September’s average humidity is slightly lower at 73%, while May sits at 75%. Precipitation in May is more pronounced, with 111 mm (4.4 in) falling over 19 days, compared to September's 70 mm (2.8 in) over 12 days. For a closer look at May weather in Andorra la Vella, you can visit Andorra la Vella weather in May.
In comparing the weather of September and June, we notice some distinct differences. September boasts a wide temperature range with minimums of -3°C and maximums reaching 23°C, while June also starts at -3°C but has a higher maximum average of 28°C. Overall, September tends to be cooler with an average temperature of 11°C compared to June's warmer 13°C. Precipitation is more pronounced in June, totaling 115 mm over 15 days compared to September's 70 mm spread over 12 days, resulting in slightly higher humidity levels in June at 74%. For more detailed insights into what to expect, you can refer to Andorra la Vella weather in June.
In comparing the weather of September and July, September tends to be cooler with average temperatures ranging from a minimum of -3°C (27°F) to a maximum of 23°C (74°F), while July experiences milder conditions with temperatures ranging from 2°C (37°F) to 26°C (78°F). Precipitation levels are relatively similar, with September receiving about 70 mm (2.8 in) over 12 days, and July slightly less at 65 mm (2.6 in) across 10 days. Interestingly, the humidity is quite close in both months, hovering around 73% in September and 72% in July. For a more detailed look at July weather specifics, visit Andorra la Vella weather in July.
In comparing the weather conditions of August and September, it’s evident that September experiences cooler temperatures, with a minimum of -3°C (27°F) compared to August's minimum of 0°C (32°F). The average temperature in September drops to 11°C (52°F), whereas August holds a warmer average of 15°C (60°F). Additionally, both months see comparable precipitation levels, with September recording 70 mm (2.8 in) and August slightly higher at 78 mm (3.1 in), both spread over 12 days. Humidity levels remain fairly consistent, at 73% in September and 70% in August. For a deeper dive into the weather specifics, you can refer to Andorra la Vella weather in August.
In September, the weather in Andorra la Vella features a milder temperature range, with minimums of -3°C (27°F) and maximums reaching up to 23°C (74°F), resulting in an average of 11°C (52°F). The month sees about 70 mm (2.8 in) of precipitation spread over 12 days and a humidity level of 73%. In contrast, October brings cooler temperatures, with minimums dropping to -13°C (9°F) and average temperatures falling to 7°C (45°F), peaking at 20°C (69°F). This month experiences slightly higher precipitation at 85 mm (3.3 in) over just 9 days, accompanied by increased humidity at 82%. For more detailed information, you can check Andorra la Vella weather in October.
September and November weather in Andorra la Vella present a significant contrast. In September, temperatures range from a mild minimum of -3°C (27°F) to a comfortable maximum of 23°C (74°F), with an average of 11°C (52°F). The month sees around 70 mm (2.8 in) of precipitation spread over 12 days, and humidity sits at a moderate 73%. In stark contrast, November experiences colder temperatures, with a minimum of -14°C (6°F) and a maximum reaching only 16°C (61°F). The average temperature drops to just 1°C (33°F), while precipitation increases to 86 mm (3.4 in) over 13 days, accompanied by higher humidity at 87%. For more specific insights on November weather in Andorra la Vella, visit Andorra la Vella weather in November.
September and December present quite contrasting weather conditions. In September, temperatures range from a chilly -3°C (27°F) at night to a pleasant 23°C (74°F) during the day, with an average of 11°C (52°F). The month experiences moderate precipitation of 70 mm (2.8 in) over about 12 days, accompanied by a humidity level of 73%. In sharp contrast, December sees much colder temperatures, with nighttime lows plunging to -14°C (6°F) and daytime highs averaging only -1°C (30°F). Precipitation increases to 93 mm (3.7 in) across the same number of days, while humidity rises to 88%, creating a much more frosty atmosphere. For a detailed look at December weather, you can visit Andorra la Vella weather in December.
As the vibrant hues of autumn begin to paint the landscape, September in Andorra la Vella offers a refreshing respite from the summer's heat. With temperatures comfortably averaging around 11°C, this month transitions smoothly from the warmer months, inviting outdoor enthusiasts to explore the picturesque surroundings. However, a notable increase in precipitation, averaging about 70 mm over roughly 12 days, brings a welcome balance to the air, complemented by a moderate humidity level of 73%. This blend of conditions marks a significant shift from the drier summer months, making September an ideal time for those seeking a mix of mild weather and captivating natural beauty. For more insights into how the weather patterns evolve throughout the year, check out Andorra la Vella Climate.