Last updated: August 27, 2025
September in Geneva, Switzerland, offers a delightful transition from summer warmth to autumn coolness. With a maximum temperature reaching 28°C (82°F) and an average of 15°C (59°F), the weather provides a comfortable atmosphere for outdoor exploration. However, evenings can be brisk, with minimum temperatures dipping to 3°C (38°F). Expect some rainfall, as the city experiences about 74 mm (2.9 in) of precipitation over 10 days, contributing to a humidity level of 81% that enhances the crispness of the air. This month presents a unique blend of warm days and cool nights, perfect for enjoying Geneva's stunning natural beauty and vibrant culture.
September in Geneva, Switzerland, welcomes the first hints of autumn with a pleasant transition in temperatures. The month experiences a minimum of 3°C (38°F), providing a crisp refresh as summer days begin to wane. With an average of 15°C (59°F), it's the perfect time for enjoying outdoor activities amidst the stunning fall foliage. Daytime highs can reach a maximum of 28°C (82°F), offering warm afternoons ideal for exploring the city’s picturesque lakes and parks. As the month progresses, expect cool evenings that invite cozy gatherings, marking a delightful shift from the warmer summer months.
In Geneva, Switzerland, September marks a transition as summer fades into autumn, reflected in its precipitation patterns. With an average rainfall of 74 mm (2.9 in), this month is notably drier than the preceding summer, which saw higher totals, particularly in May at 172 mm (6.8 in). Interestingly, September experiences just 10 days of precipitation, demonstrating a trend towards more stable weather as the season shifts. This reduction in rainy days is characteristic of the month, contributing to the overall moderate climate before temperatures dip further in the fall, setting the stage for the heavier rains that arrive in October and December.
September in Geneva, Switzerland, experiences a notable shift in humidity, reflecting the transition from the warm summer months to the crispness of autumn. With an average humidity level of 81%, September sits comfortably between the drier months of August at 77% and the much more humid October at 89%. This mild humidity percentage captures the essence of early fall, where the air retains some of the summer’s warmth yet begins to embrace the chill of the upcoming season. As temperatures start to drop, the consistent levels of humidity from April to September suggest a gradual decrease, providing a refreshing breeze that characterizes Geneva’s early autumn charm.
As summer fades into fall in Geneva, Switzerland, September presents a high UV Index of 7, indicating a need for caution as you enjoy the outdoors. While exposure remains significant, the burn time extends back to 25 minutes, aligning with the trends seen earlier in the year—particularly during the peak summer months when the UV readings hit their highest at 10 in June. This pattern suggests that while the intensity is decreasing, protective measures should still be prioritized. As autumn approaches, don't let your guard down; be mindful of the potential for UV-related skin damage. For more details on UV levels throughout the year, check out the comprehensive Geneve UV Index.
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As summer gently fades into autumn, September in Geneva offers a delightful balance of warmth and sunshine, boasting 327 hours of bright daylight. This month showcases a slight decline from the peak summer months of July and August, which recorded impressive totals of 414 and 384 hours respectively. However, compared to the earlier months of the year, September remains a vibrant time, significantly brighter than January’s mere 159 hours. The transition into fall is marked by a gradual decrease in light, yet September’s lingering sunshine invites residents and visitors alike to savor the beauty of the season, as nature begins its colorful transformation.
As September rolls in, Geneva, Switzerland experiences a 40% chance of sunny weather, marking a slight dip from the summer months but still offering a pleasant blend of sun and shade. This pattern reflects a gradual transition toward autumn, where the likelihood of sunshine shows a trend of fluctuation throughout the year. Notably, the amount of sunshine peaks in April, where the chance reaches 53%, before tapering off in the cooler months. As the warmth of summer fades, September offers a balanced choice for outdoor enthusiasts, combining comfortable temperatures with a decent possibility of clear skies, making it an inviting time for visitors to explore the city’s scenic beauty.
As the vibrant summer months fade, September in Geneva brings a gentle transition into autumn, with daylight lasting about 12 hours. This decrease is a soft yet marked shift from the generous 15 hours enjoyed in June and July. The month showcases the diminishing daylight that begins in late summer, a trend that continues into October, which dips to 10 hours. Interestingly, even as daylight hours shorten, September's glow still offers a sense of warmth and brightness, bridging the final days of summer with the cozy embrace of fall. The progression from long, sun-drenched days to the shorter, crisp days of winter captures the beauty of seasonal change in this picturesque Swiss city.
As September rolls into Geneva, a noticeable shift in the average wind speed sets the stage for the transition into autumn. With a gentle breeze of just 1.4 m/s (3 mph), this month marks the calmest point of the year, reflecting a slight but steady decline in wind intensity from the preceding summer months. Following a trend of gradually increasing winds from January through April, the winds peak slightly in springtime with an average of 2.2 m/s (5 mph) before tapering off, presenting a whisper of tranquility as nature prepares for the cooler months ahead. This subtle lull is a reminder of September’s serene charm, inviting residents and visitors alike to embrace the scenic beauty of the lake and the rustic allure of the city's parks amidst the soft, rustling leaves.
Weather in Geneve varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Geneve, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, temperatures in Geneva range from a minimum of 3°C (38°F) to a maximum of 28°C (82°F), with an average of 15°C (59°F). The month sees about 74 mm (2.9 in) of precipitation, occurring over 10 days, and humidity levels are relatively high at 81%. In contrast, January brings much colder weather, with temperatures dipping significantly to a minimum of -13°C (8°F) and peaking at 14°C (58°F), averaging just 1°C (34°F). Precipitation increases to 116 mm (4.6 in) over 11 days, and humidity rises to 91%, making January quite damp and chilly. For more details on January weather, you can visit Geneve weather in January.
September and February present contrasting weather patterns. In September, temperatures range from a mild 3°C (38°F) to a warm 28°C (82°F), with an average of 15°C (59°F), creating a pleasant atmosphere for outdoor activities. The month experiences 74 mm (2.9 in) of precipitation over about 10 days, with a humidity level of 81%. In contrast, February is significantly colder, with temperatures ranging from a minimum of -12°C (10°F) to a maximum of 17°C (64°F), averaging just 4°C (39°F). This month sees slightly more precipitation at 96 mm (3.8 in) over 11 days, accompanied by a higher humidity level of 89%. For more detailed insights, you can check out Geneve weather in February.
In September, temperatures typically range from a minimum of 3°C (38°F) to a maximum of 28°C (82°F), with an average temperature of 15°C (59°F). The month sees around 74 mm (2.9 in) of precipitation spread over approximately 10 days and carries a humidity level of 81%. In contrast, March experiences colder temperatures, with a minimum of -12°C (10°F) and a maximum of 21°C (69°F), averaging around 6°C (43°F). This month is wetter as well, with total precipitation reaching 134 mm (5.3 in) over about 14 days, with humidity slightly higher at 87%. For more detailed information about the weather patterns in March, you can visit Geneve weather in March.
In comparing the weather between September and April, September presents a milder climate with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 28°C (82°F). In contrast, April sees lower average temperatures, with a minimum of -6°C (21°F) and a maximum of 25°C (77°F). While both months experience relatively consistent precipitation levels—74 mm (2.9 in) in September versus 67 mm (2.6 in) in April—September has slightly more rainy days, averaging 10 compared to April's 9 days. Furthermore, humidity is comparable, with September at 81% and April slightly higher at 84%. For more detailed insights on the weather in April, you can visit Geneve weather in April.
September weather typically features a wider range of temperatures, with minimums around 3°C (38°F) and maximums reaching 28°C (82°F), resulting in a pleasant average of 15°C (59°F). In contrast, May starts off colder, with minimum temperatures dropping to -1°C (30°F), but can also reach similar maximums of 29°C (84°F), resulting in an average temperature of 13°C (55°F). We see a notable increase in precipitation during May, accumulating 172 mm (6.8 in) over 16 days compared to September's 74 mm (2.9 in) over just 10 days, although the humidity remains fairly consistent at around 80-81%. For a closer look at May weather specifics, check out Geneve weather in May.
In comparing the weather of September and June, we notice notable differences in temperature and precipitation patterns. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 28°C (82°F), with an average of 15°C (59°F). This month sees around 74 mm (2.9 in) of precipitation over approximately 10 days, while humidity averages 81%. Contrastingly, June experiences higher temperatures, with a minimum of 6°C (42°F), an average of 18°C (64°F), and a maximum of 33°C (92°F). Rainfall in June is also more abundant, totaling 121 mm (4.8 in) spread across about 14 days, accompanied by slightly higher humidity at 82%. For more detailed information, you can check out Geneve weather in June.
When comparing the weather in September to that of July, notable differences emerge. September exhibits a broader temperature range, with minimums dipping to 3°C (38°F), while July remains warmer, starting at a minimum of 9°C (48°F) and reaching highs of 34°C (93°F). The average temperature in September is a milder 15°C (59°F), compared to July's more comfortable average of 19°C (67°F). Additionally, September experiences less precipitation, with 74 mm (2.9 in) spread over 10 days, while July sees higher rainfall at 110 mm (4.3 in) over 13 days. Humidity levels remain fairly consistent, with September at 81% and July slightly higher at 82%. For more detailed information about July weather, you can check Geneve weather in July.
In September, the weather cools down significantly compared to August, with minimum temperatures dropping to 3°C (38°F) from August's 8°C (46°F) and average temperatures decreasing from 19°C (66°F) to 15°C (59°F). The maximum temperature in September reaches 28°C (82°F), which is lower than August's peak of 33°C (92°F). While September experiences less overall precipitation at 74 mm (2.9 in) over 10 days, compared to August's 108 mm (4.3 in) over 13 days, humidity remains relatively high in September at 81%, slightly above August's 77%. For more detailed weather information in August, you can refer to Geneve weather in August.
September typically showcases a warmer climate compared to October, with average temperatures ranging from a mild 15°C (59°F) to a maximum of 28°C (82°F). In contrast, October experiences cooler temperatures, with averages dropping to 10°C (51°F) and a maximum of 22°C (72°F), while the minimum can dip to -1°C (31°F). Additionally, October sees an increase in precipitation, totaling 116 mm (4.6 in) over approximately 11 days, compared to September's 74 mm (2.9 in) over 10 days, contributing to a higher humidity level of 89% in October. If you're interested in more specifics about October weather in Geneva, you can explore Geneve weather in October.
In September, the weather is notably mild, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 28°C (82°F), averaging around 15°C (59°F). The month sees moderate rainfall with 74 mm (2.9 in) over about 10 days, while humidity sits at 81%. In contrast, November experiences cooler temperatures, with a minimum of -3°C (27°F) and a maximum of 19°C (66°F), averaging only 5°C (42°F). Precipitation increases to 109 mm (4.3 in) across 13 days, and the humidity rises slightly to 89%. For more details on November weather specifics, check out Geneve weather in November.
September and December present strikingly different weather patterns. In September, temperatures range from a chilly 3°C (38°F) at night to a pleasant 28°C (82°F) during the day, with an average of 15°C (59°F). This month also experiences around 74 mm (2.9 in) of precipitation over 10 days, accompanied by humidity levels of 81%. In contrast, December brings much colder weather, with temperatures dipping as low as -9°C (16°F) and averaging only 2°C (37°F). The maximum temperature reaches a milder 13°C (56°F), but the total precipitation significantly increases to 203 mm (8.0 in) across 18 days, along with higher humidity at 91%. For more detailed insights, check Geneve weather in December.
As September unfolds in Geneva, the weather presents a delightful transition from the warmth of summer to the crisp embrace of autumn. This month typically showcases milder temperatures, with daily averages that allow for both warm afternoons and cool evenings, setting it apart from the hotter summer months. While the humidity remains relatively high, the likelihood of rain increases, with several days of precipitation contributing to the lushness of the surrounding landscapes. It’s a time when the city begins to shimmer in autumn tones, making September a uniquely enchanting period for visitors and locals alike. To explore the full range of weather throughout the year, visit Geneve Climate.