Last updated: August 27, 2025
September in Lachen, Switzerland offers a delightful transition into autumn, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 27°C (80°F) and an average of 14°C (57°F). This month brings about 123 mm (4.9 in) of precipitation across approximately 14 days, contributing to the region's lush landscapes. With humidity levels averaging 83%, the air carries a refreshing crispness, making it an ideal time for outdoor exploration and enjoying the breathtaking natural scenery that Lachen has to offer.
As September unfolds in Lachen, Switzerland, a noticeable transition occurs from the warm embrace of summer to the cooler embrace of fall. With minimum temperatures hovering around 2°C (36°F) and maximums reaching a comfortable 27°C (80°F), this month offers a delightful blend of warm days and crisp evenings. The average temperature settles at 14°C (57°F), making it an inviting time for outdoor activities and enjoying the fall foliage. As the month progresses, you'll feel the shift toward colder weather, highlighting the seasonal transition that characterizes this charming lakeside town. Embrace the beauty of early autumn as Lachen's landscapes transform under the changing skies, creating an idyllic backdrop for your adventures.
In September, Lachen experiences a notable transition with precipitation totaling 123 mm (4.9 in), reflecting the region's gradual shift from the drier summer months. With 14 rainy days, this month showcases an increase in moisture, paving the way for the upcoming autumn season. Compared to the preceding months, September presents a slight decrease in rainfall, particularly when juxtaposed with the highs of June and August, where rainfall peaked at 187 mm and 158 mm, respectively. This trend indicates a seasonal decline as summer gives way to fall, yet the precipitation remains substantial enough to sustain the lush landscapes that characterize this picturesque Swiss town. As October approaches, the cycle continues, with precipitation anticipated to stabilize around similar levels, marking a consistent rhythm in Lachen’s climatic pattern.
September in Lachen, Switzerland, brings a shift in humidity levels, settling at 83%. This figure reflects a slight increase from the preceding months of summer, where humidity dipped to 80% in both May and August. As the region transitions from the warmth of summer to the chill of autumn, it appears that humidity levels begin to stabilize, remaining relatively consistent compared to the midsummer highs. Notably, as the year progresses into October, humidity soars back to 90%, indicating that the region experiences a humid end to the year. Thus, September serves as a gentle reminder of the approaching seasonal changes, offering a brief reprieve before the return of the more humid autumn months.
In September, Lachen, Switzerland enjoys a moderate UV Index of 6, categorizing sun exposure as high with a burn time of 25 minutes. This drop from the peak summer months indicates a gradual transition as autumn approaches, yet sun protection remains essential. With consistent high readings throughout the summer—peaking at 10 in June—the UV Index in September highlights the importance of adjusting sun safety habits as the days become shorter. As a reminder, even in early fall, it’s wise to stay vigilant about UV exposure. For more information, visit Lachen UV Index.
UV Risk Categories
September in Lachen, Switzerland, offers a delightful blend of warmth and sunshine, with 314 hours of sunlight enriching the early autumn days. This month stands out as a transition from the summery peak of July, which boasts an impressive 410 hours, to the milder hours of October, dropping to 275 hours. As the summer fades, September retains a significant amount of daylight, surpassing earlier months like November and January, which can feel particularly gloomy with only 211 hours and 163 hours of sunshine, respectively. The gradual decline in sunshine from the vibrant months of June and July provides a stunning backdrop for the scenic beauty of Lachen, allowing visitors to admire the changing foliage while basking in the lingering warmth of early autumn light.
As summer wanes, September in Lachen, Switzerland offers a bright respite with a 43% chance of sunny weather. This represents a notable shift from the preceding months, as the likelihood of sunshine rebounds from a dip in the summer, which sees lower percentages between 32% and 37%. While not as high as the earlier spring months, September's sunshine probabilities create a pleasant blend of warmth and clarity, making it an appealing time for outdoor adventures. As the vibrant hues of autumn begin to emerge, visitors can enjoy a tapestry of sunny days against the stunning Alpine backdrop, ideal for exploring the natural beauty of the region.
As autumn approaches in Lachen, Switzerland, the days begin to shorten, with September bringing a gentle decline in daylight to approximately 12 hours. This transition marks a shift from the long, sun-drenched days of summer, where June, July, and August bask in a consistent 15 hours of daylight. As the year progresses from the bright 15 hours of May to the mellow yet still generous hours of early fall, the natural light begins to wane gradually. This rhythm of daylight not only enhances the vivid colors of the changing leaves but also invites a cozy ambiance as residents prepare for the cooler months ahead.
As summer fades and autumn approaches in Lachen, Switzerland, September greets us with a gentle breeze averaging 1.5 m/s (3 mph). This consistent wind speed mirrors the calmer conditions of the previous months, as the peak of summer's mild gusts recedes. Notably, September's breeziness is aligned with August, hinting at a tranquil transition towards the cooler fall days ahead. With only a slight uptick in wind speed to 1.6 m/s (4 mph) projected for October, this gradual shift captures the essence of early autumn, setting a serene atmosphere for outdoor activities and scenic views.
Weather in Lachen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lachen, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present starkly contrasting weather conditions. In September, temperatures range from a mild 2°C (36°F) at night to a warm 27°C (80°F) during the day, with an average of 14°C (57°F). The month experiences considerable rainfall, totaling 123 mm (4.9 in) over approximately 14 days, accompanied by high humidity at 83%. In contrast, January is much colder, with temperatures plummeting to a minimum of -12°C (10°F) and an average of 0°C (32°F), peaking at 13°C (56°F). Despite similar levels of precipitation at 127 mm (5.0 in) over 12 days, January's humidity is higher at 92%. For more detailed information about January weather, you can check Lachen weather in January.
September and February exhibit markedly different weather patterns. September typically presents a mild climate with average temperatures ranging from a low of 2°C (36°F) to a high of 27°C (80°F) and a total precipitation of 123 mm (4.9 in) over 14 days. This month is characterized by relatively high humidity levels at 83%, creating a warm and sometimes humid atmosphere.
In contrast, February is much colder, with temperatures averaging between -15°C (6°F) and 17°C (62°F), reflecting its winter season. While precipitation is somewhat less at 95 mm (3.7 in) over 12 days, the humidity remains elevated at 89%, contributing to a chilling environment. For more details on the February climate, you can refer to Lachen weather in February.
September and March present contrasting weather patterns marked by significant differences in temperature and humidity levels. In September, temperatures range from a mild 2°C (36°F) at night to a warm 27°C (80°F) during the day, averaging around 14°C (57°F). The month typically experiences moderate precipitation of 123 mm (4.9 in) over approximately 14 days, with an average humidity of 83%.
In contrast, March is much colder, with nighttime lows plummeting to -16°C (4°F) and daytime highs reaching only 19°C (67°F), averaging just 4°C (40°F). The month sees slightly less precipitation at 112 mm (4.4 in), but rain falls on about 17 days, contributing to a higher average humidity of 87%. For more detailed insights on March weather, check out Lachen weather in March.
September and April present distinctly different weather patterns. In September, temperatures range from a minimum of 2°C (36°F) to a maximum of 27°C (80°F), with an average of 14°C (57°F). The month experiences a higher total precipitation of 123 mm (4.9 in) over approximately 14 days and maintains a humidity level of 83%. In contrast, April is cooler, with temperatures ranging from a minimum of -7°C (19°F) to a maximum of 24°C (76°F) and an average of 8°C (47°F). It also sees less rainfall, accumulating about 87 mm (3.4 in) over 12 days, while maintaining a slightly higher humidity of 84%. For a more detailed look at Lachen's weather during this month, you can check out Lachen weather in April.
In comparing the weather between September and May, September typically enjoys milder conditions with average temperatures ranging from a minimum of 2°C (36°F) to a maximum of 27°C (80°F). The month experiences around 123 mm (4.9 in) of precipitation spread over 14 days, combined with a relatively high humidity of 83%. In contrast, May has cooler nights with temperatures dipping to a minimum of -5°C (24°F), while the daytime highs reach up to 28°C (84°F). It also receives more precipitation at 159 mm (6.3 in) over 20 days, though humidity is slightly lower at 80%. For a detailed look at May weather specifics, you can check this link: Lachen weather in May.
September and June exhibit notable differences in weather patterns, with September experiencing a cooler temperature range; it records a minimum of 2°C (36°F) and an average of 14°C (57°F), compared to June's minimum of 4°C (40°F) and an average of 17°C (63°F). June also boasts warmer maximum temperatures, reaching up to 32°C (90°F), while September tops out at 27°C (80°F). Additionally, precipitation levels are higher in June, with 187 mm (7.4 in) over 17 days, compared to September's 123 mm (4.9 in) over 14 days, although both months maintain similar humidity levels, around 82-83%. For more detailed insights on the June weather, you can check this link: Lachen weather in June.
In comparing the weather of September and July, we see notable differences. September features cooler temperatures, with a minimum of 2°C (36°F) and an average of 14°C (57°F), while July boasts a higher minimum of 8°C (47°F) and an average of 18°C (65°F). July also reaches warmer maximums, peaking at 33°C (91°F), compared to September's maximum of 27°C (80°F). Both months experience significant precipitation, with September receiving 123 mm (4.9 in) over 14 days and July slightly wetter with 145 mm (5.7 in) over 16 days. Notably, humidity remains consistent at 83% for both months, creating a humid atmosphere. For more insights on July weather, you can check Lachen weather in July.
Comparing the weather between August and September reveals some notable differences. In August, temperatures are generally warmer, with a minimum of 8°C (46°F) and a maximum of 32°C (90°F), while September sees cooler nights with a minimum of only 2°C (36°F) and a maximum of 27°C (80°F). Average temperatures also drop from 18°C (65°F) in August to 14°C (57°F) in September. August experiences slightly more precipitation at 158 mm (6.2 in) over 15 days, compared to September's 123 mm (4.9 in) across 14 days. Both months have high humidity, but September’s humidity stands at 83%, a bit higher than August's 80%. For more details about August weather, you can check Lachen weather in August.
September typically brings a warmer climate with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 27°C (80°F), and an average of 14°C (57°F). In contrast, October sees a noticeable drop in temperatures, with a minimum of 0°C (32°F) and a maximum of 22°C (72°F), along with an average of 10°C (50°F). Both months experience significant rainfall, with September recording 123 mm (4.9 in) over 14 days and October slightly higher at 128 mm (5.0 in) across 13 days. Additionally, humidity increases in October to 90%, compared to 83% in September. For a detailed look at October conditions, you can visit Lachen weather in October.
September and November exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 2°C (36°F) to a maximum of 27°C (80°F), with an average of 14°C (57°F). The month experiences higher precipitation, totaling 123 mm (4.9 in) over 14 days, and the humidity stands at 83%. In contrast, November sees cooler temperatures, with a minimum of -5°C (24°F) and a maximum of 20°C (69°F), resulting in an average of 4°C (40°F). Precipitation decreases to 80 mm (3.1 in) across 13 days, while humidity rises slightly to 88%. For more detailed information, check out Lachen weather in November.
In September, the weather tends to be milder with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 27°C (80°F), averaging around 14°C (57°F). The month experiences significant rainfall, totaling 123 mm (4.9 in) over about 14 days, and has a humidity level of 83%, contributing to a pleasant but slightly damp atmosphere. In contrast, December brings much colder conditions, with temperatures dropping significantly, ranging from -10°C (14°F) to a maximum of 12°C (54°F) and averaging just 2°C (35°F). The precipitation in December increases to 155 mm (6.1 in) over 19 days, and the humidity rises to 90%, making the environment feel even chillier. For more detailed information, you can check Lachen weather in December.
As September unfolds in Lachen, the weather begins to transition from the warmth of summer to the cooler embrace of autumn. With average temperatures around 14°C, the month strikes a balance that feels refreshingly brisk, especially when contrasted with the sweltering highs of July and August. However, September is not without its share of rain, as it experiences about 14 wet days and accumulates a notable 123 mm of precipitation, leading to a distinct rise in humidity levels at 83%. This blend of moderate temperatures and increased rainfall makes September a unique month in Lachen, setting the stage for the vibrant fall foliage to come. For more detailed insights into the weather patterns, explore Lachen Climate.