Last updated: August 27, 2025
September in Appenzell, Switzerland showcases a delightful blend of mild temperatures and lush landscapes. With maximum temperatures reaching 25°C (78°F) and an average of 13°C (55°F), visitors can relish in comfortable outdoor adventures, while the minimum dips to chilly 0°C (32°F) during the night. The region experiences 158 mm (6.2 in) of precipitation over 16 days, contributing to its vibrant greenery. During this month, humidity levels hover around 83%, creating a refreshing atmosphere perfect for exploring the scenic beauty and unique charm of this picturesque Swiss town.
As September rolls into Appenzell, Switzerland, temperatures begin their gentle descent, signaling the transition from the warmth of summer to the crispness of fall. With minimums around 0°C (32°F) and average highs reaching 25°C (78°F), the weather offers a delightful blend of warmth and coolness. This month typically sees an average temperature of 13°C (55°F), making it an ideal time for outdoor adventures amidst the stunning autumn foliage. While the nights grow cooler, the days remain pleasantly mild, inviting visitors to relish in the breathtaking landscapes before the chill of winter sets in. As summer warmth lingers on, September in Appenzell is a perfect blend of seasonal change, creating a picturesque backdrop for exploring this charming Swiss region.
September in Appenzell, Switzerland, is marked by a notable precipitation level of 158 mm (6.2 in), accompanied by 16 days of rain. This month follows the exceptionally wet August, which recorded the highest rainfall of the year at 233 mm (9.2 in), suggesting a gradual tapering off of summer storms. The significant rainfall in September contributes to the lush landscapes that characterize the region. As autumn sets in, this transitional month averages slightly lower precipitation than its summer predecessor but still maintains a robust moisture profile that prepares the soil for the cooler months ahead. Notably, with September's precipitation surpassing that of March and April, it demonstrates the lingering effects of summer’s moisture even as the days begin to shorten.
As September rolls into Appenzell, Switzerland, the air carries a humidity level of 83%, marking a slight increase from the drier summer months of 80% in both May and August. This subtle rise hints at the gradual transition towards the wetter autumn months. The humidity remains comfortably lower than the winter peaks, which soar to 92% in January and 90% in both October and December. Overall, September offers a balance, a bridge between the season's warmth and the forthcoming cold, making it a unique time to experience the region's beauty before the heavier dampness sets in.
As summer transitions into autumn, September in Appenzell, Switzerland sees a UV Index of 7, indicating a shift into the high exposure category with a burn time of 25 minutes. This trend marks a gradual decline from the blistering very high levels experienced in July and August, where the UV Index peaked at 10. However, September still demands awareness, as its UV levels remain notably elevated compared to earlier months. The seasonal pattern highlights how crucial it is to adapt sun safety practices as sunlight intensity diminishes while still posing risks to skin health. For further insights on UV exposure throughout the year, visit Appenzell UV Index.
UV Risk Categories
As summer gracefully transitions to autumn, September in Appenzell, Switzerland, offers a delightful blend of sunny days and cooler breezes. With 316 hours of sunshine, this month reflects a notable shift from the peak of summer, where July dazzled with an impressive 409 hours. While September's sun-kissed moments are fewer than the summer months, they still surpass the autumn gloom that follows, as October dips to 282 hours. This coastline of light amidst the backdrop of breathtaking landscapes invites visitors to savor the last warm days before the crispness of fall sets in. As such, September becomes a cherished time for outdoor adventures, showcasing nature’s beauty while basking in the golden glow of the sun.
In Appenzell, Switzerland, September stands out with a 42% chance of sunshine, making it one of the more favorable months for sun-seekers as summer transitions into autumn. This slight uptick in sunny days follows a gradual increase from the cooler months, with April showing a modest 43% and early summer presenting lower probabilities around 30%. As the season shifts, September’s weather offers a pleasant reprieve from the overcast skies that often dominate the winter months, as evidenced by the average rates in preceding months. The consistent upward trend in sunny chances helps to create an inviting atmosphere for outdoor activities, allowing visitors and locals alike to enjoy the beautiful landscapes before the chill of autumn sets in.
As summer fades into autumn in Appenzell, Switzerland, the daylight duration begins to shift noticeably. September, with its 12 hours of daylight, marks a graceful transition from the sun-soaked days of July and August, where the sun lingered for up to 15 hours. This gradual decline signals the upcoming changes of fall, as daylight narrows further to 10 hours in October and 9 hours by November. The rhythm of the seasons becomes evident, reminding us of nature's cycle—from the long, bright days of summer to the shorter, cozier evenings of fall and winter.
As September arrives in Appenzell, Switzerland, the gentle breezes continue a steady rhythm, with an average wind speed of 1.2 m/s (3 mph). This modest wind pattern mirrors the calmness of the summer months, particularly August, which recorded the year's lowest wind speed. Interestingly, September's winds are slightly brisker than those of the preceding month, hinting at the subtle shifts of autumn beginning to brush the landscape. Throughout the year, wind speeds fluctuate modestly, peaking in the winter and early spring months, yet September stands out as a transitional period, gracefully balancing the residual warmth of summer with the forthcoming cooler air. As the winds swirl around the picturesque hills, they whisper promises of the vibrant fall foliage to come, making September a serene yet dynamic time in Appenzell.
Weather in Appenzell varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Appenzell, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather conditions. In September, temperatures range from a chilly 0°C (32°F) to a warm 25°C (78°F), with an average of 13°C (55°F). This month experiences considerable rainfall, totaling 158 mm (6.2 in) over 16 days, and a relatively high humidity level of 83%. In contrast, January brings significantly colder temperatures, with lows plummeting to -23°C (-9°F) and a maximum of 11°C (52°F), averaging around -2°C (29°F). Although precipitation is slightly lower at 134 mm (5.3 in) over just 12 days, the humidity is even higher at 92%. For more detailed insights into January weather, visit Appenzell weather in January.
September and February present contrasting weather patterns in terms of temperature and precipitation. In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 25°C (78°F), with an average of 13°C (55°F). The month sees significant precipitation, totaling 158 mm (6.2 in) over about 16 days, coupled with a humidity level of 83%. On the other hand, February experiences much colder conditions, with temperatures dipping as low as -18°C (0°F) and averaging around 0°C (33°F), peaking at 16°C (61°F). Although February receives less precipitation, at 97 mm (3.8 in) over approximately 12 days, it has a slightly higher humidity of 89%. For a detailed look at weather conditions, you can check out Appenzell weather in February.
In September, the weather is notably milder, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 25°C (78°F) and an average of 13°C (55°F). The month also experiences significant rainfall, totaling 158 mm (6.2 in) over 16 days, coupled with high humidity at 83%. In contrast, March is much colder, featuring temperatures that can drop to a minimum of -20°C (-4°F) and peak at 18°C (65°F), with an average of 3°C (38°F). While it sees less total precipitation at 123 mm (4.8 in) across 17 days, the humidity remains high at 87%. For more detailed insights into March, you can visit Appenzell weather in March. Overall, September offers a warm transition into autumn, while March remains firmly entrenched in the cold of winter.
When comparing the weather in September and April, notable differences emerge. September typically experiences milder temperatures, ranging from a minimum of 0°C (32°F) to a maximum of 25°C (78°F), with an average of 13°C (55°F). In contrast, April features cooler temperatures, where lows can drop to -12°C (11°F) and highs reach up to 23°C (73°F), averaging around 7°C (45°F). While September sees more precipitation, totaling 158 mm (6.2 in) over 16 days, April has less rainfall at 103 mm (4.0 in) over 12 days, though it maintains a slightly higher humidity level at 84%. For more detailed weather insights, you can visit Appenzell weather in April.
In comparing the weather between September and May, September tends to be warmer, with average temperatures ranging from 0°C (32°F) to a maximum of 25°C (78°F), while May has slightly cooler averages, with temperatures between -6°C (21°F) and a maximum of 28°C (83°F). However, May experiences slightly higher precipitation levels, accumulating 183 mm (7.2 in) over 21 days, compared to September's 158 mm (6.2 in) over 16 days. Humidity levels are comparable, with September at 83% and May at 80%, making both months feel quite moist. For a deeper dive into the specifics of May weather, you can check Appenzell weather in May.
When comparing the weather in September and June, we see distinct differences in temperature and precipitation patterns. September tends to be cooler with average temperatures ranging from a chilly 0°C (32°F) to a pleasant 25°C (78°F), while June offers warmer conditions, with averages from 2°C (36°F) to a summery 31°C (88°F). In terms of precipitation, September receives 158 mm (6.2 in) over approximately 16 days, slightly less than June's 191 mm (7.5 in) across 19 days. Interestingly, although both months have high humidity levels, September's humidity is slightly higher at 83%, compared to June's 82%. For more detailed information about June weather, you can visit Appenzell weather in June.
In comparing the weather of September and July, we see a notable shift in temperatures and precipitation patterns. September experiences cooler temperatures with a minimum of 0°C (32°F) and a maximum of 25°C (78°F), averaging around 13°C (55°F). In contrast, July is generally warmer, featuring a minimum of 7°C (45°F) and rising to a maximum of 31°C (88°F), with an average of 17°C (62°F). Additionally, while both months have high humidity at 83%, July has more precipitation, totaling 211 mm (8.3 in) over 20 days, compared to September's 158 mm (6.2 in) across 16 days. For more detailed information, you can check the Appenzell weather in July.
In August, the weather is generally warmer with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 30°C (87°F), resulting in an average of 17°C (62°F). This month also experiences higher precipitation levels at 233 mm (9.2 in) over 19 days, accompanied by a humidity level of 80%. In contrast, September sees cooler temperatures with a minimum of 0°C (32°F) and a maximum of 25°C (78°F), averaging 13°C (55°F). Although September has a lower total precipitation of 158 mm (6.2 in) across 16 days, the humidity increases slightly to 83%. For a more detailed look at August weather, you can visit Appenzell weather in August.
September typically features a milder climate with average temperatures ranging from 0°C (32°F) to 25°C (78°F), while October sees a drop in the average temperature to between -2°C (28°F) and 21°C (70°F). Although both months experience substantial rainfall, September is slightly wetter with 158 mm (6.2 in) of precipitation over 16 days, compared to October's 141 mm (5.6 in) over 14 days. Additionally, October's humidity rises to 90%, making it a bit more humid than September's 83%. For more detailed insights, you can check Appenzell weather in October.
In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 25°C (78°F), with an average of 13°C (55°F), while November experiences cooler temperatures, with a minimum of -8°C (17°F) and a maximum of 19°C (66°F), averaging around 4°C (39°F). September sees significantly more rainfall, totaling 158 mm (6.2 in) over 16 days, compared to November's 88 mm (3.5 in) over just 11 days. Additionally, humidity levels rise slightly in November to 88%, compared to 83% in September. For a detailed look at November weather in the region, visit Appenzell weather in November.
September and December present contrasting weather experiences in Appenzell. In September, temperatures range from a cool 0°C (32°F) at night to a warm 25°C (78°F) during the day, with an average of 13°C (55°F). The month sees about 158 mm (6.2 in) of precipitation across 16 days, accompanied by a relatively high humidity of 83%. In stark contrast, December brings much colder conditions, with temperatures dipping as low as -17°C (2°F) and averaging around -1°C (31°F), peaking at 12°C (54°F). Precipitation remains similar at 156 mm (6.2 in), but it occurs over 18 days with even higher humidity at 90%. For more details, visit Appenzell weather in December.
As the warm embrace of summer fades, September in Appenzell reveals a unique tapestry of weather that sets it apart from the preceding months. Characterized by a notable dip in temperatures, days can range from mild warmth to the brisk chill of early autumn, heralding the shift in season. This month is also marked by increased precipitation, with rain gracing over half of September’s days, creating a lush backdrop for the vibrant changing foliage. Coupled with high humidity, the air feels rich and invigorating. For those looking to experience the serene beauty of Appenzell during this transitional period, understanding its distinct weather patterns is essential. Discover more about this charming region's atmospheric nuances at Appenzell Climate.