Last updated: August 27, 2025
September in Luzern, Switzerland is a month of transition, where summer's warmth gently gives way to autumn's cool embrace. With maximum temperatures reaching a pleasant 25°C (78°F) and an average of 14°C (58°F), visitors can enjoy the crisp air during the day, while evenings may dip to a cool 3°C (37°F). The month is marked by an average precipitation of 138 mm (5.4 in) over 15 days, contributing to the lush landscapes that surround this picturesque city. Humidity is relatively high at 83%, enhancing the refreshing vibe of early autumn in Luzern, making it a perfect time for exploration and enjoying the stunning natural beauty that the area offers.
As summer transitions to autumn in Luzern, Switzerland, September offers a refreshing climate that strikes a balance between warmth and coolness. With minimum temperatures around 3°C (37°F) and pleasant averages of 14°C (58°F), this month provides a comfortable backdrop for outdoor activities and scenic explorations. The maximums peak at a delightful 25°C (78°F), allowing for lingering days where sunshine and gentle breezes invite travelers to soak in the beautiful surroundings. This gradual cooling trend heralds the change of seasons, transitioning from the warmth of summer into the crispness of fall, making September an ideal time to experience Luzern’s vibrant landscape.
In September, Luzern experiences 138 mm (5.4 in) of precipitation, a total comparable to January's rainfall. The month sees an average of 15 days with rain, marking a shift from the drier summer months. This consistent level of precipitation indicates a gradual transition into the wetter autumn season, reminiscent of the robust rainfall observed in May and June. As nature prepares for the cooler months ahead, the balance of sunny days and rainy spells in September makes it an ideal time to witness the stunning landscapes of Luzern as they evolve into vibrant autumn hues.
As autumn approaches, September humidity in Luzern settles at a comfortable 83%, slightly rising from the summer months of 80% in both June and August. This subtle increase reflects the transition from the warm, drier days of summer to the wetter conditions typical of fall. Following the trend of the previous months, humidity remains relatively stable, punctuated by a sharp rise to 90% in October as the region prepares for the cooler and wetter season ahead. Overall, the humidity in Luzern shows a gentle decline from January's peak of 92%, but consistently fluctuates within a narrow range, creating a generally humid yet pleasant climate throughout the year.
As September unfolds in Luzern, Switzerland, the UV Index settles at 6, indicating a high exposure category and a burn time of 25 minutes. This marks a gradual decline from the intense summer months, where both July and August recorded a peak Index of 9. While the UV rays are still potent enough to necessitate caution, the cooler September air provides a more comfortable backdrop for outdoor activities compared to the scorching summer days. Travelers and locals alike should still be mindful of sun protection, as the fading but noticeable UV levels remind us that even as summer wanes, the sun can still be quite fierce. For more information on keeping safe under the sun, check out the detailed Luzern UV Index.
UV Risk Categories
September in Luzern, Switzerland, shines with a delightful 320 hours of sunshine, making it a perfect transition from the vibrant summer months to the crispness of autumn. Following the sun-drenched days of July and August, which boast 415 and 384 hours respectively, September continues to offer a generous share of sunlight, albeit slightly diminished. This gradual decline in daylight hours hints at the changing seasons, as the sunny skies of late summer give way to the cozy allure of fall. With the beautiful landscapes of the Swiss countryside bathed in golden light, September provides a stunning backdrop for exploration and outdoor activities, encouraging both locals and visitors to savor the lingering warmth before the cooler months set in.
In Luzern, Switzerland, the likelihood of sunny weather in September stands at 36%, making it one of the more favorable months for sunshine in the early autumn season. This percentage is consistent with the sunshine chances seen in August and October, indicating a stable trend as the summer transitions into fall. Interestingly, while earlier months like March and April show a gradual increase in sunny days, the consistency in sunshine during September reflects the lingering warmth of late summer. Although September doesn't boast the highest sunshine probabilities of the year, it does offer a pleasant balance, perfect for enjoying the picturesque landscapes of Luzern under a partly sunny sky.
As September unfolds in Luzern, Switzerland, daylight begins its graceful descent from the summer peak, offering around 12 hours of sunlight. This marks a transition from the vibrant 15 hours of daylight enjoyed in June through August, as the days gradually shorten. While the warmth of summer lingers, the sunlight starts to soften, paving the way for the cooler autumn months ahead. Following September, sunlight availability will continue to decline, dipping to 10 hours in October, as nature prepares for the cozy embrace of winter. The rhythm of the seasons is palpable, inviting visitors and locals alike to savor the golden hues of early fall in this enchanting Swiss city.
As September sweeps into Luzern, Switzerland, the gentle breeze typically slows down to an average wind speed of 1.3 m/s (3 mph), mirroring the calmness that marks the transition into autumn. This month aligns closely with the summer's quieter wind patterns observed from June through August, where winds remained consistently mild. However, it is noteworthy that September's winds are slightly lower than the springtime peaks seen in May, suggesting a serene atmosphere as nature prepares for the upcoming months. The consistent mildness throughout the year invites residents and visitors to enjoy tranquil strolls along the picturesque lake and through the charming streets, where the changing seasons come alive in vibrant colors and fresh vistas.
Weather in Luzern varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Luzern, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, Luzern experiences a mild transition into autumn, with average temperatures fluctuating between a brisk 3°C (37°F) and a comfortable 25°C (78°F). The city sees about 138 mm (5.4 in) of rainfall over approximately 15 days, accompanied by an 83% humidity level. Conversely, January brings a stark contrast as winter fully settles in, with temperatures plummeting to a minimum of -13°C (10°F) and peaking at a mere 12°C (54°F). Despite having a similar total precipitation of 138 mm (5.4 in), January sees slightly less rainfall spread across 13 days and a higher humidity level of 92%. For more detailed information, you can check Luzern weather in January.
In September, the weather in Luzern is marked by a mild climate, with temperatures ranging from a chilly 3°C (37°F) at night to a warm 25°C (78°F) during the day, and an average of 14°C (58°F). This month experiences considerable rainfall, with 138 mm (5.4 in) spread over 15 days and an humidity level of 83%. In contrast, February brings much colder conditions, with temperatures dipping down to a minimum of -17°C (2°F) and an average of only 2°C (36°F), peaking at 16°C (62°F). Precipitation in February is slightly less at 107 mm (4.2 in), falling on 12 days, while humidity remains high at 89%. For more detailed insights, you can check Luzern weather in February.
September and March present distinct weather patterns, highlighting the transition from summer to early spring. In September, temperatures range from a cool 3°C (37°F) at night to a pleasant 25°C (78°F) during the day, with an average temperature of 14°C (58°F). However, it comes with notable humidity at 83% and 138 mm of precipitation over 15 days. In contrast, March experiences colder temperatures with a minimum of -13°C (8°F) and a maximum of 18°C (65°F), averaging just 4°C (40°F). While precipitation in March is slightly lower at 126 mm across 16 days, the humidity is slightly higher at 87%. For a detailed comparison of weather in March, you can explore Luzern weather in March.
September and April present contrasting weather patterns, each with its own unique characteristics. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 25°C (78°F), averaging around 14°C (58°F). This month typically experiences higher rainfall, with 138 mm (5.4 inches) over about 15 days, and humidity levels at 83%. In comparison, April features cooler temperatures, with a minimum of -6°C (21°F) and an average of 8°C (46°F), climbing to a maximum of 23°C (73°F). Precipitation in April is lower at 102 mm (4.0 inches) over 12 days, and the humidity is slightly higher at 84%. For a more detailed look at the weather during this time, check Luzern weather in April.
When comparing the weather in September and May, September offers milder temperatures with a minimum of 3°C (37°F), an average of 14°C (58°F), and a maximum of 25°C (78°F). In contrast, May experiences a broader temperature range, with a minimum of -6°C (21°F) and a maximum of 28°C (83°F), although it has a cooler average of 11°C (52°F). Both months see significant precipitation, with September receiving 138 mm (5.4 in) over 15 days, while May has a slightly higher total of 172 mm (6.8 in) spread across 19 days. Humidity levels are also comparable, with September at 83% and May slightly lower at 80%. For a deeper dive into May's weather specifics, you can check Luzern weather in May.
In comparing the weather of September and June, we can see some notable differences. September has a cooler average temperature, ranging from a minimum of 3°C (37°F) to a maximum of 25°C (78°F), whereas June typically sees warmer temperatures, with a minimum of 5°C (41°F) and a high of 32°C (90°F). Additionally, June experiences more precipitation, averaging 202 mm (8.0 in) over 18 days compared to September's 138 mm (5.4 in) spread over 15 days. Humidity levels are relatively similar, with September at 83% and June slightly lower at 82%. For more detailed insights, you can check the Luzern 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 (37°F) to a maximum of 25°C (78°F), whereas July enjoys warmer conditions, with temperatures peaking at 31°C (89°F) and averaging 18°C (64°F). Both months experience high humidity levels of 83%, but July sees more significant rainfall, with 199 mm (7.8 in) over 18 days compared to September's 138 mm (5.4 in) across 15 days. For more detailed information on the weather in July, you can visit this link: Luzern weather in July.
In comparing the weather between September and August, September experiences cooler temperatures with a minimum of 3°C (37°F) compared to August's 8°C (46°F). The average temperature in September is also lower at 14°C (58°F) than August's 18°C (64°F), and September's maximum temperature reaches 25°C (78°F), which is quite a bit cooler than August’s peak of 30°C (87°F). Precipitation increases slightly in September with 138 mm (5.4 in) over 15 days, whereas August sees a higher total of 193 mm (7.6 in) across 16 days. Humidity remains relatively high in both months, with September at 83% and August at 80%. For more detailed weather insights, you can visit Luzern weather in August.
September generally enjoys milder weather, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 25°C (78°F), and an average of 14°C (58°F). While the month sees a fair amount of precipitation, totaling 138 mm (5.4 in) spread over 15 days, the humidity is lower at 83%. In contrast, October brings a noticeable drop in temperatures, with a minimum of 1°C (34°F) and an average of 10°C (50°F), peaking at 21°C (70°F). This month also experiences slightly more rainfall, accumulating 158 mm (6.2 in) over 14 days, coupled with higher humidity at 90%. For more detailed insights, check out Luzern weather in October.
In September, the weather is generally warmer, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 25°C (78°F), and an overall average of 14°C (58°F). This month also sees a higher amount of precipitation, totaling 138 mm (5.4 in) over 15 days, accompanied by a humidity level of 83%. In contrast, November experiences cooler temperatures, with a minimum of -4°C (26°F) and an average of 5°C (41°F), peaking at 20°C (68°F). Precipitation in November is lower at 97 mm (3.8 in) spread over 13 days, and humidity rises slightly to 88%. For more detailed insights into the weather in November, you can visit Luzern weather in November.
The weather in September tends to be warmer and more variable compared to December, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 25°C (78°F) and an average of 14°C (58°F). In contrast, December experiences colder temperatures, with a minimum of -9°C (16°F) and a maximum of 11°C (53°F), averaging just 2°C (35°F). Additionally, September receives about 138 mm (5.4 in) of precipitation over 15 days, while December sees increased rainfall at 169 mm (6.6 in) over 18 days. The humidity also rises significantly in December at 90%, compared to 83% in September. For more detailed insights, visit Luzern weather in December.
As September unfolds in Luzern, it captivates with a blend of mild temperatures and a touch of early autumn charm. Unlike the warmer summer months, the average temperature drops, making the air feel refreshingly crisp, especially in the early mornings. With a notable increase in precipitation, residents and visitors alike experience lively showers that punctuate the changing season, contrasting sharply with the dry spells of July and August. The high humidity adds to the seasonal ambiance, wrapping the city in a soft mist that enhances its scenic beauty. For those curious about how Luzern's weather compares throughout the year, explore more about its unique climate at Luzern Climate.