Last updated: August 27, 2025
September in Nyon, Switzerland, offers a delightful tapestry of weather patterns, with maximum temperatures reaching up to 26°C (80°F), while the average settles at a comfortable 15°C (60°F). As autumn approaches, the minimum temperature dips to around 5°C (41°F), showcasing the seasonal transition. Visitors can expect a wet month, with total precipitation measuring 94 mm (3.7 in) over approximately 12 days, creating a lush backdrop for exploring the picturesque landscapes. The air carries a hum of 81% humidity, making this charming lakeside town a refreshing destination as summer wanes.
September in Nyon, Switzerland, marks a pleasant transition from the warmth of summer to the crispness of autumn. With temperatures ranging from a minimum of 5°C (41°F) to a maximum of 26°C (80°F), this month offers a comfortable average temperature of 15°C (60°F), making it an ideal time for outdoor activities. As the days grow shorter and cooler, the slight dip in nighttime temperatures hints at the coming fall, while the residual warmth ensures that afternoons are still enjoyable. This balance encourages locals and visitors alike to savor the natural beauty of the region, where vibrant autumn foliage begins to paint the landscape, providing an ideal backdrop for leisurely strolls along Lake Geneva.
September in Nyon, Switzerland, typically brings a moderate level of rainfall, with an average precipitation of 94 mm (3.7 in) spread across 12 days. This marks a slight decrease compared to the wetter months of May and March, where precipitation peaks at 163 mm (6.4 in) and 140 mm (5.5 in) respectively. As the summer warmth begins to wane, September’s showers become a refreshing transition into autumn, hinting at the wetter conditions that are to come in October with an average of 121 mm (4.8 in). This pattern reveals a clear trend of increasing precipitation as the year progresses towards winter, suggesting that while September can be rainy, it offers a welcome reprieve before the onset of the more intense rainfall typical of the later months.
As September rolls in, Nyon, Switzerland experiences a notable shift in humidity, settling at 81%. This slight rise from the drier August (77%) hints at the approaching autumn, characterized by a gradual increase in moisture levels. The summer months have predominantly enjoyed lower humidity, with May showcasing the least at 80%. However, as the year progresses, humidity levels rise again, peaking at 91% in the winter months of January and December. Overall, this trend illustrates a cyclical pattern where the humid air of autumn and winter contrasts sharply with the relatively crisp conditions of summer, defining the region's unique climate experience throughout the year.
In September, Nyon experiences a UV Index of 7, classifying it within the high exposure category; this indicates a notable decrease from the peak summer months. As outdoor enthusiasts return to their activities, it's essential to remember that the burn time for fair-skinned individuals is approximately 25 minutes. This trend shows a gradual decline from the scorching heights of June and July, where the UV Index soared to 10 and 9, respectively, reflecting a more moderate but still significant risk as autumn approaches. As you plan your September outings, ensure to check the forecast and stay protected from the sun's rays to enjoy the beautiful Swiss landscapes safely. For more insights, visit Nyon UV Index.
UV Risk Categories
As summer transitions into autumn, September in Nyon, Switzerland, shines brightly with an impressive 327 hours of sunshine. This month sees a subtle dip from the sun-drenched heights of July and August yet remains among the year's sunniest, trailing closely behind the vibrant summer months. The gradual decrease in sunlight begins its course here, but the warmth of late summer still lingers, setting the stage for a picturesque transition into the rich colors of autumn. While September marks a shift towards cooler days, it continues to bask in a generous supply of sunlight, creating an inviting atmosphere for outdoor explorations and scenic strolls along Lake Geneva’s shores.
In Nyon, Switzerland, September maintains a 37% chance of sunny weather, aligning closely with the summer months of July (37%) and August (41%). This trend indicates that while the warmth and brightness of summer begin to wane, there’s still a moderate likelihood of enjoying sunny days. Looking back at the year, the transition from summer to early autumn sees a slight dip, but September's sunshine probability is notably higher than the depths of winter, where the likelihood drops to a mere 15% in January. Therefore, while September may usher in cooler temperatures, it still offers a fair chance for sun-soaked afternoons, making it a delightful time to explore the picturesque landscapes of Nyon.
As summer bids farewell in September, the picturesque town of Nyon, Switzerland, experiences a gentle ebb in daylight, with the sun gracing the skies for about 12 hours each day. This month marks a transition from the 15 hours of sunshine enjoyed in the peak of summer, as daylight gradually recedes into the cooler, crisper months ahead. The decrease serves as a reminder of the shifting seasons, with each passing month reflecting a steady decline—from 15 hours in July to just 8 hours by December. September's 12-hour daylight not only gives residents a brief chance to savor the last rays of summer but also signals the approach of autumn, inviting everyone to embrace the stunning fall colors and the cozy ambiance that follows.
As autumn begins to weave its colors through Nyon in September, the gentle breezes shift noticeably, with average wind speeds dipping to 1.6 m/s (4 mph). This marks a decline from the vibrant spring and summer months, where winds danced slightly stronger, peaking at 2.6 m/s (6 mph) in April. The trend reveals a gradual softening of the winds as the year progresses; from the bustling gusts of early months to the calm, reflective air of September. As the warmth of summer gives way to the crispness of fall, Nyon experiences a serene tranquility, making it a perfect time for leisurely strolls along the lake, accompanied by the soft whispers of the September wind.
Weather in Nyon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Nyon, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present strikingly different weather patterns. In September, temperatures range from a minimum of 5°C (41°F) to a pleasant maximum of 26°C (80°F), with an average of 15°C (60°F) and relatively high humidity at 81%. This month typically experiences 94 mm (3.7 in) of precipitation over around 12 days, marking it as a transitional period into autumn. Conversely, January is much colder, with temperatures plummeting to a minimum of -7°C (20°F) and an average of just 2°C (36°F), peaking at a maximum of 13°C (55°F). This winter month experiences increased precipitation of 127 mm (5.0 in), also over approximately 12 days, and a slightly higher humidity level of 91%. For those interested in more details, see Nyon weather in January.
In September, temperatures in Nyon can range from a mild 5°C (41°F) at night to a warm 26°C (80°F) during the day, with an average temperature of 15°C (60°F). The month experiences a fair amount of precipitation, totaling 94 mm (3.7 in) over 12 days, and humidity levels are quite high at 81%. In contrast, February presents a much colder climate, with minimum temperatures plummeting to -11°C (13°F) and an average of only 4°C (40°F). The maximum temperature peaks at 17°C (62°F) and precipitation exceeds September slightly at 98 mm (3.9 in) over the same number of days. Notably, February comes with higher humidity levels at 89%, creating a noticeably chillier and more damp atmosphere. For more specific details on February weather, you can visit Nyon weather in February.
September and March exhibit distinctly different weather patterns, reflecting the transition between seasons. In September, temperatures range from a mild 5°C (41°F) to a warm 26°C (80°F), with an average of 15°C (60°F), making it generally more pleasant. However, it also sees about 94 mm (3.7 in) of rainfall spread over 12 days, contributing to a humidity level of 81%.
Conversely, March experiences cooler temperatures, with a minimum of -9°C (16°F) and a maximum of 20°C (69°F), averaging just 6°C (43°F). It is also wetter, with approximately 140 mm (5.5 in) of precipitation over 14 days, leading to a higher humidity level of 87%. For more details about the weather in this month, you can visit Nyon weather in March.
When comparing the weather in September and April, notable differences emerge. September typically offers warmer temperatures with a minimum of 5°C (41°F) and an average of 15°C (60°F), rising to a maximum of 26°C (80°F). It also features higher precipitation levels, averaging 94 mm (3.7 in) over 12 days, with humidity around 81%. In contrast, April presents cooler conditions, with temperatures ranging from a minimum of -3°C (27°F) to a maximum of 24°C (76°F) and an average of 9°C (49°F). Precipitation in April is lower at 64 mm (2.5 in) over 10 days, accompanied by slightly higher humidity at 84%. For a more detailed look at April weather patterns, check out Nyon weather in April.
When comparing the weather in September and May, several notable differences emerge. September tends to have a milder average temperature, ranging from a minimum of 5°C (41°F) to a maximum of 26°C (80°F), while May starts cooler with temperatures from a minimum of 0°C (33°F) to a maximum of 26°C (79°F). Precipitation levels are higher in May, with 163 mm (6.4 in) spread over 17 days, compared to September's 94 mm (3.7 in) over 12 days. Humidity levels are relatively similar in both months, hovering around 80-81%. For more detailed weather conditions in May, you can visit Nyon weather in May.
In comparing the weather of September and June, notable differences emerge in temperature and precipitation. September experiences a milder climate, with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 26°C (80°F) and an average of 15°C (60°F). In contrast, June boasts warmer temperatures, with a minimum of 8°C (47°F) and a peak reaching 32°C (91°F), averaging around 17°C (64°F). Both months see significant rainfall, but June has higher precipitation at 126 mm (5.0 in) across 15 days compared to September's 94 mm (3.7 in) over 12 days. Humidity levels are fairly similar, hovering around 81% in September and slightly higher at 82% in June. For a detailed look at June weather, you can check Nyon weather in June.
In comparing the weather between September and July, we see notable differences in temperature and precipitation. July tends to be warmer, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 33°C (91°F), compared to September's milder averages of 5°C (41°F) to 26°C (80°F). While July has a higher average temperature of 19°C (67°F), September offers cooler conditions with an average of 15°C (60°F). Precipitation is also more frequent in July, occurring over 15 days with a total of 130 mm (5.1 in), whereas September experiences 94 mm (3.7 in) of rain over 12 days. Both months maintain similar humidity levels, making the weather feel consistently damp. For more specifics on July weather, you can visit Nyon weather in July.
In comparing the weather patterns of September and August, we observe a noticeable shift towards cooler temperatures in September. While August features a minimum temperature of 8°C (47°F) and an average of 19°C (66°F), September sees a drop with temperatures starting at a minimum of 5°C (41°F) and averaging 15°C (60°F). Furthermore, August tends to be warmer overall, peaking at a maximum of 32°C (89°F) compared to September's maximum of 26°C (80°F). Precipitation levels are also higher in August, with 126 mm (5.0 in) over 15 days, while September experiences 94 mm (3.7 in) across 12 days. Humidity remains relatively high in both months, slightly increasing in September to 81% from August's 77%. For a more detailed look at August weather specifics, you can check Nyon weather in August.
In comparing the weather from September to October, it is clear that October brings cooler temperatures, with average highs dropping from 15°C (60°F) in September to 11°C (52°F). The minimum temperatures also decline, from a comfortable 5°C (41°F) in September to a chilly 1°C (34°F) in October. Additionally, October sees an increase in precipitation, rising to 121 mm (4.8 in) over 13 days, compared to 94 mm (3.7 in) across 12 days in September. The humidity also rises from 81% in September to 89% in October, creating a more damp atmosphere. For a detailed look at the specific conditions, check out Nyon weather in October.
September and November present distinctly different weather patterns. In September, temperatures range from a mild 5°C (41°F) at night to a warm 26°C (80°F) during the day, with an average temperature of 15°C (60°F). The month sees around 94 mm (3.7 in) of precipitation over approximately 12 days and maintains a relatively comfortable humidity level of 81%. In contrast, November experiences cooler temperatures, with minimums dropping to -1°C (31°F) and an average temperature of just 6°C (43°F). It also sees slightly increased precipitation, totaling 116 mm (4.6 in) over about 14 days and higher humidity at 89%. For more detailed insights about the weather during this time, check out Nyon weather in November.
September and December present quite contrasting weather conditions. In September, temperatures range from a pleasant minimum of 5°C (41°F) to a warm maximum of 26°C (80°F), with an average temperature of about 15°C (60°F). The month experiences moderate precipitation of 94 mm (3.7 inches) over 12 days, accompanied by a humidity level of 81%. In contrast, December ushers in much colder temperatures, with lows reaching -5°C (24°F) and a maximum of only 12°C (55°F), resulting in an average temperature of 3°C (38°F). This month sees significantly higher precipitation at 213 mm (8.4 inches) spread over 19 days and an increased humidity of 91%. For a detailed look at what to expect, check out Nyon weather in December.
As summer transitions into fall, September in Nyon brings a delightful mix of mild temperatures and increasing humidity. The pleasant days are framed by cool evenings, creating a unique charm that distinguishes this month from the rest of the year. While rainfall occurs more frequently, with an average of 12 days of precipitation, the scenery transforms into a vibrant display of autumn colors. Whether you're enjoying outdoor activities or cozying up indoors, September's weather offers a refreshing change. Explore more about the climate specifics by visiting Nyon Climate.