Last updated: August 27, 2025
In September, Saint-Cergue, Switzerland experiences a delightful transition into autumn, marked by an average temperature of 15°C (60°F). Daily highs can reach a pleasant 26°C (80°F), while the nights cool down to a brisk 5°C (41°F). This month sees 12 days of precipitation, totaling 94 mm (3.7 in), contributing to the region's lush landscapes. With a humidity level of 81%, the air is crisp yet refreshing, making September a captivating time to explore the beauty of this picturesque Swiss locale.
In September, Saint-Cergue begins to transition from the warmth of summer to the crispness of autumn. With average temperatures lingering around 15°C (60°F), the month offers a delightful balance as the scenery shifts from lush greens to vibrant fall colors. Morning temperatures dip to a pleasant 5°C (41°F), while afternoons can reach a refreshing 26°C (80°F), allowing for comfortable outdoor activities. This delightful climate makes September an ideal time for hiking and enjoying the serene beauty of the Swiss Alps, as the cool breeze begins to signal the impending change of season. Overall, the month is characterized by mild weather that invites both adventure and relaxation amidst breathtaking landscapes.
In September, Saint-Cergue experiences a notable transition in its weather patterns, marked by an average precipitation of 94 mm (3.7 in) over approximately 12 days of rain. This amount is slightly lower than the summer months, as it shows a decrease from August's consistent 126 mm (5.0 in). As autumn approaches, the area shifts into a stage of gradual moisture decline, setting the stage for the wetter months ahead, such as October and December, which typically bring more significant rainfall, with 121 mm (4.8 in) and 213 mm (8.4 in) respectively. Overall, September serves as a bridge between the vibrant summer rains and the heavy precipitation of late autumn, showcasing the region's dynamic climate.
In September, Saint-Cergue, Switzerland experiences a relative humidity of 81%, signaling a transition as summer wanes and autumn approaches. Throughout the year, humidity levels start high in January, at 91%, gradually decrease during late spring and summer, reaching their lowest point in August at 77%. However, as the temperature begins to drop in September, humidity levels see a slight uptick, hinting at the cooler, wetter months ahead. This pattern highlights the region's notable trend of higher humidity in the colder months, with levels expected to rise again in October and remain elevated through the winter.
As summer gives way to autumn in Saint-Cergue, Switzerland, the UV Index shows a gradual decline in intensity. In September, the UV Index rests at 7, categorized as high, with a burn time of approximately 25 minutes for unprotected skin. This marks a slight decrease from the very high levels experienced during the peak summer months of June through August, where the Index reached a maximum of 10. The shift in September is a reminder of the transitioning seasons and the need for mindful sun protection. As the year progresses, the UV Index will continue to fluctuate, falling to 5 by October. For a detailed view of seasonal UV intensity, explore Saint-Cergue UV Index.
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As summer gracefully transitions to fall, September in Saint-Cergue shines brightly with 327 hours of sunshine. This month marks a gentle decline from the sun-drenched days of July and August, which boasted 414 and 384 hours respectively. Notably, September still outshines the earlier months in the year, showcasing a steady upward trend in sunlight from January's mere 159 hours. With the crisp air of autumn setting in, visitors can enjoy the vibrant hues of the changing leaves while basking in a month that offers a pleasant balance of sunshine, making it an ideal time to explore the stunning landscapes of Switzerland.
In Saint-Cergue, Switzerland, September holds a 37% chance of sunny weather, marking a slight dip from the sunniest summer months but still offering a reasonable opportunity for clear skies. As the seasons transition, the likelihood of sunshine remains relatively stable compared to the fluctuations seen from earlier months like April (50%) and May (29%). Notably, while July and August bring heightened summer sunshine, September's metrics suggest a gradual retraction as autumn approaches. Yet, with a chance of sun still above the average for the year, September offers a pleasant balance for those looking to enjoy the crisp mountain air and stunning alpine scenery.
As September arrives in Saint-Cergue, Switzerland, the days begin to shorten, with an average of 12 hours of daylight. This transition marks a gentle decline from the sun-drenched months of summer, where June, July, and August boast a generous 15 hours of daylight. As autumn sets in, September serves as a bridge between the vibrant summer and the cooler, darker days ahead, reminiscent of April's blossoming 13 hours. The gradual reduction in daylight leads into October's 10 hours, illustrating a clear trend of diminishing daylight as the year progresses—the perfect time to enjoy the stunning alpine views while the days are still relatively long.
As September unfolds in Saint-Cergue, Switzerland, the tranquil landscapes are accompanied by gentler breezes, with the average wind speed dipping to a modest 1.6 m/s (4 mph). This slight decrease reflects a seasonal trend, as the winds generally ease after the brisk spring months, with July and August also experiencing similar calmness. However, as autumn approaches, there is a subtle upturn in the wind speeds expected in October, hinting at the dynamic shifts that characterize the changing seasons. Overall, September's winds lull into a serene atmosphere, perfect for enjoying the picturesque surroundings and preparing for the vibrant fall ahead.
Weather in Saint-Cergue varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Saint-Cergue, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather of September and January, we see a distinct contrast in temperatures and precipitation patterns. September features milder temperatures with a minimum of 5°C (41°F) and an average of 15°C (60°F), peaking at 26°C (80°F), making it a more comfortable month. It also experiences less rainfall, with precipitation at 94 mm (3.7 in) over 12 days and a humidity level of 81%.
In contrast, January brings much colder conditions, with temperatures dropping to a minimum of -7°C (20°F) and averaging just 2°C (36°F), while the maximum temperature reaches only 13°C (55°F). This winter month sees increased precipitation, totaling 127 mm (5.0 in) over the same number of days, and a higher humidity level of 91%. For more detailed insights into the January climate, you can check Saint-Cergue weather in January.
September and February weather in Saint-Cergue present a striking contrast in temperatures and conditions. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 26°C (80°F), with an average of 15°C (60°F). This month experiences around 94 mm (3.7 in) of precipitation over approximately 12 days, accompanied by a relatively high humidity of 81%. In contrast, February sees much colder temperatures, with a minimum of -11°C (13°F) and a maximum of 17°C (62°F), averaging only 4°C (40°F). Despite a similar number of rainy days and a slightly higher precipitation total of 98 mm (3.9 in), February is characterized by a higher humidity level of 89%. For a detailed look at February's conditions, visit Saint-Cergue weather in February.
September and March present quite 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 of 15°C (60°F). The month enjoys 94 mm (3.7 in) of precipitation over about 12 days, with a relatively comfortable humidity of 81%. In contrast, March is much cooler, with temperatures dipping to a minimum of -9°C (16°F) and peaking at 20°C (69°F), averaging just 6°C (43°F). This month receives more rainfall, totaling 140 mm (5.5 in) across 14 days, and has higher humidity at 87%. For more detailed information, check out Saint-Cergue weather in March.
In comparing the weather of September and April, we find notable differences in temperature and precipitation. September boasts a milder climate, with average temperatures ranging from a minimum of 5°C (41°F) to a maximum of 26°C (80°F). In contrast, April experiences cooler temperatures, with lows reaching as low as -3°C (27°F) and an average max of 24°C (76°F). While September is characterized by higher precipitation levels, receiving 94 mm (3.7 in) over 12 days, April sees less rainfall at 64 mm (2.5 in) across 10 days. Additionally, humidity levels are slightly higher in April at 84%, compared to September's 81%. For a closer look at what to expect in April, you can check out the Saint-Cergue weather in April.
In comparing September and May weather, both months experience a maximum temperature of around 26°C (79-80°F), but September has a slightly warmer average temperature of 15°C (60°F) compared to May's 12°C (55°F). While May sees a higher minimum temperature of 0°C (33°F), it tends to be wetter, with 163 mm (6.4 in) of precipitation over 17 days, surpassing September's 94 mm (3.7 in) over 12 days. Humidity levels remain similar, with September at 81% and May at 80%. For a closer look at May weather specifics, you can check Saint-Cergue weather in May.
In comparing the weather of September and June, we observe notable differences in temperature and precipitation. September experiences a milder temperature range with minimums around 5°C (41°F) and maximums peaking at 26°C (80°F), averaging 15°C (60°F). In contrast, June is generally warmer, with minimum temperatures of 8°C (47°F) and maximums soaring up to 32°C (91°F), resulting in an average of 17°C (64°F).
Precipitation levels also vary, with September receiving about 94 mm (3.7 inches) over 12 days, while June sees a higher total of 126 mm (5.0 inches) over 15 days. Humidity levels remain fairly similar, hovering around 81% in September and slightly higher at 82% in June. For a more detailed look at June weather in this region, you can visit Saint-Cergue weather in June.
When comparing the weather between September and July, we find notable differences in both temperature and precipitation patterns. July tends to be warmer, with temperatures averaging 19°C (67°F) and reaching a maximum of 33°C (91°F), while September’s average temperature hovers at a cooler 15°C (60°F), peaking at 26°C (80°F). Precipitation is also higher in July, with 130 mm (5.1 in) occurring over 15 days compared to September's 94 mm (3.7 in) over 12 days. Despite being slightly cooler and drier, September maintains a high humidity level of 81%, similar to July's 82%. For more specific insights on July weather, you can visit Saint-Cergue weather in July.
In comparing the weather of August and September, a notable shift in temperatures can be observed. August typically enjoys warmer conditions with a minimum temperature of 8°C (47°F) and an average of 19°C (66°F), peaking at 32°C (89°F). In contrast, September experiences cooler temperatures, with a minimum of 5°C (41°F), an average of 15°C (60°F), and a maximum of 26°C (80°F). Additionally, September sees an increase in precipitation, totaling 94 mm (3.7 in) over 12 days, whereas August has higher overall rainfall at 126 mm (5.0 in) over 15 days. Humidity levels are also slightly higher in September at 81%, compared to August's 77%. For more detailed information, you can check the Saint-Cergue weather in August.
September in Saint-Cergue experiences milder temperatures, with a minimum of 5°C (41°F) and an average of 15°C (60°F), reaching a maximum of 26°C (80°F). The month sees about 94 mm (3.7 in) of precipitation over 12 days, coupled with a humidity level of 81%. In contrast, October brings cooler conditions, with temperatures dropping to a minimum of 1°C (34°F) and an average of 11°C (52°F), while the maximum temperature reaches 22°C (71°F). Precipitation also increases in October to 121 mm (4.8 in), spread over 13 days, and humidity rises to 89%. For more details, check Saint-Cergue weather in October.
September and November present contrasting weather patterns, characterized by decreasing temperatures and increasing humidity. In September, the average temperature hovers around 15°C (60°F), with a maximum of 26°C (80°F), while November sees a noticeable drop, with an average of just 6°C (43°F) and a maximum of 17°C (64°F). Precipitation also intensifies as the seasons change, with September receiving 94 mm (3.7 in) over 12 days compared to November's 116 mm (4.6 in) across 14 days. Furthermore, November experiences a higher humidity level of 89%, up from September's 81%. For more details on the weather in November, you can check Saint-Cergue weather in November.
In September, temperatures in Saint-Cergue typically range from a mild 5°C (41°F) at night to a comfortable 26°C (80°F) during the day, with an average of 15°C (60°F). The month sees about 94 mm (3.7 in) of precipitation over approximately 12 days, accompanied by a humidity level of 81%.
In contrast, December ushers in much chillier weather, with temperatures dropping to a minimum of -5°C (24°F) and peaking at a modest 12°C (55°F), averaging around 3°C (38°F). This month experiences significantly more rainfall, totaling 213 mm (8.4 in) across 19 days, and an increase in humidity to 91%. For more details about the weather specifics during this month, visit Saint-Cergue weather in December.
As the summer winds down, September in Saint-Cergue brings a refreshing change in weather that sets it apart from the warmer months. With average temperatures settling around a comfortable 15°C (60°F), the crisp air invites outdoor enthusiasts to explore the stunning landscapes. Rainfall is more pronounced this month, contributing to the lushness of the region, with precipitation recorded on about 12 days. Coupled with higher humidity levels, this leads to vibrant autumn foliage that starts to emerge. For those looking to experience a unique transitional period, September offers a delightful blend of warmth and coolness, making it an ideal time for both relaxation and adventure. To learn more about the climate throughout the year, visit Saint-Cergue Climate.