Last updated: August 27, 2025
Experience the captivating weather of Bern, Switzerland, in September, where temperatures fluctuate from a comfortable average of 15°C (60°F) to a warm maximum of 29°C (84°F). As autumn begins to set in, the city sees a minimum temperature of 3°C (38°F) during the cooler nights. Expect some moisture in the air, with precipitation totaling 61 mm (2.4 in) across 11 days, accompanied by a relatively high humidity of 81%. Whether you’re exploring the scenic streets or enjoying the beautiful parks, September offers a delightful blend of warmth and mild weather that makes Bern a perfect destination.
In September, Bern, Switzerland, experiences a noticeable transition as summer gently gives way to autumn. The temperatures begin with a cool minimum of 3°C (38°F), rising to an enjoyable average of 15°C (60°F), and peaking at a delightful 29°C (84°F). This month marks a departure from the intense summer heat, yet it still offers pleasant days, making it an ideal time for outdoor activities and exploring the city’s stunning landscapes. As the month progresses, you can feel the crispness in the air, hinting at the upcoming fall. Overall, September provides a harmonious blend of warmth and coolness, reflecting the beauty of seasonal change.
In September, Bern experiences a dip in precipitation, with 61 mm (2.4 in) of rain falling over 11 days. This amount marks a notable decrease compared to the wetter summer months of May, June, and July, where rainfall frequently exceeded 100 mm. As autumn approaches, the shift to drier conditions becomes evident, setting the stage for a more temperate climate. With fewer precipitation days, residents and visitors alike can enjoy the crisp air and vibrant fall foliage, making September a delightful time to explore the scenic charm of Bern.
In September, Bern experiences a slight uptick in humidity, reaching 81%, following the warmer and drier months of July and August, which recorded 82% and 77% respectively. This minor increase signifies the transition into autumn, as humidity levels begin to rise again, paving the way for the wetter months ahead. Overall, the humidity in Bern shows a gradual decrease from the start of the year, with peaks in the depths of winter at 91% in January and December. As the seasons change, September acts as a bridge, gently nudging the city back towards the higher humidity levels that define its late-year climate.
As September rolls into Bern, Switzerland, the UV Index dips to 6, indicating a high exposure category with a burn time of 25 minutes. This marks a transition from the intense summer months, where the UV levels peaked at 9 during July and June, promoting cautious sun exposure. While September's UV Index is lower than its summer counterparts, it still signals the importance of sun safety as the sun can still cause harm, especially during midday hours. The gradual decrease from the summer's very high levels showcases a shift towards autumn, but vigilance is key. For more insights on UV levels throughout the year, explore the Bern UV Index.
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As the warm glow of September settles over Bern, Switzerland, the city basks in an impressive 325 hours of sunshine, maintaining a delightful bridge between the vibrant summer months and the onset of autumn. Following the sunniest peaks of July and August, September gracefully showcases a decline in hours, yet it remains brighter than many of the winter months ahead. The transition from the high of 417 hours in July reveals a natural rhythm, where daylight begins to retreat but still offers ample time for outdoor adventures and contemplation. With September's sunshine serving as a gentle reminder of summer's lingering warmth, residents and visitors alike can savor the beauty of this enchanting city as it prepares for the colorful leaves and cooler days of fall.
In September, Bern, Switzerland enjoys a 39% chance of sunny weather, reflecting a pleasant transition as summer gracefully gives way to autumn. This figure showcases a modest increase from the summer months, with July and August averaging around 36% and 38%. As the weather begins to cool, the likelihood of sun remains relatively stable compared to the preceding months. Interestingly, this slight uptick hints at a lingering summer vibe, inviting outdoor enthusiasts to bask in the mild weather before the chill of October sets in. Overall, September is an ideal time to experience the beauty of Bern under the sun, making it a popular choice for travelers and locals alike.
As summer gently gives way to autumn, September in Bern, Switzerland, offers a charming transition with 12 hours of daylight. Following the vibrant months of June, July, and August, which boast a maximum of 15 hours, September reflects a gradual decrease, signaling the impending cooler seasons. This reduction in daylight hours — from the sunlit heights of summer to the more muted brightness of early autumn — provides a gentle reminder of nature's rhythms. The daylight duration continues to wane as October approaches, foreshadowing the shorter days that characterize winter. Thus, September becomes a beautiful melding of lingering summer warmth and the crisp anticipation of fall.
As autumn approaches in Bern, Switzerland, the September winds present a gentle shift, averaging a modest 1.5 m/s (3 mph). This marks a continuation of the lighter breezes that prevail during the summer months, where wind speeds gradually declined from 2.4 m/s (5 mph) in May to just 1.6 m/s (4 mph) in August. While September's winds may be softer, they usher in the serene beauty of fall, heralding colorful foliage and cooler temperatures. The trend of decreasing wind speeds from the spring peak reflects the transition towards the quieter months of the year, inviting residents and visitors alike to enjoy the tranquil charm of Bern in early autumn.
Weather in Bern varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Bern, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather patterns. In September, temperatures range from a chilly 3°C (38°F) at night to a warm 29°C (84°F) during the day, with an average of 15°C (60°F). The month experiences about 61 mm (2.4 in) of precipitation spread over 11 days, and humidity hovers around 81%. In stark contrast, January features a much colder climate, with temperatures dipping as low as -14°C (6°F), an average of just 1°C (34°F), and a maximum of 17°C (63°F). This winter month experiences more precipitation at 91 mm (3.6 in) across 12 days, with humidity rising slightly to 91%. For more details, you can check out Bern weather in January.
September and February exhibit distinctly different weather patterns, reflecting the transition from summer to winter. In September, temperatures range from a mild 3°C (38°F) to a warm 29°C (84°F), with an average of 15°C (60°F) and relatively lower humidity levels at 81%. The month also sees about 61 mm (2.4 in) of precipitation spread over 11 days, making it a fairly pleasant time of year.
Conversely, February brings a significant drop in temperatures, featuring a minimum of -11°C (13°F) and an average of just 4°C (39°F), peaking at 18°C (65°F). The humidity rises to 89%, creating a colder and often damp environment. February experiences slightly more precipitation at 74 mm (2.9 in) over the same number of days. For more details on February weather, you can check Bern weather in February.
In comparing the weather of September and March, one can observe distinct differences in temperature and conditions. September typically experiences milder temperatures with a minimum of 3°C (38°F) and an average of 15°C (60°F), reaching a maximum of 29°C (84°F). In contrast, March is much colder, featuring a minimum temperature of -13°C (8°F) and an average of 6°C (43°F), with a maximum of 21°C (70°F). Additionally, March has more frequent precipitation, with 91 mm (3.6 in) falling over 15 days, compared to September's 61 mm (2.4 in) across 11 days. The humidity levels are also slightly higher in March at 87%, compared to 81% in September. For a more detailed look at the weather conditions during March, you can visit Bern weather in March.
In comparing the weather of September and April, September tends to be milder, with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F), while April experiences cooler temperatures, with lows dipping to -5°C (23°F) and highs reaching only 25°C (78°F). Both months receive similar amounts of precipitation, each recording around 61 mm (2.4 in), but September is slightly wetter with rain falling on 11 days compared to April’s 10 days. Moreover, humidity levels are slightly higher in April at 84%, compared to September's 81%. For more detailed insights into April's weather, you can check out Bern weather in April.
When comparing September and May weather, several notable differences emerge. September typically enjoys warmer temperatures, with average highs around 29°C (84°F) and lows of 3°C (38°F), while May's temperatures hover around 30°C (86°F) at the maximum but dip to a chilly -2°C (28°F) at night. Both months experience relatively high humidity levels, with September at 81% and May slightly lower at 80%. Precipitation is also more pronounced in May, accumulating to 126 mm (5.0 in) over 16 days, compared to September's 61 mm (2.4 in) over 11 days. For a closer look at May's weather specifics, check out Bern weather in May.
September and June present a noticeable contrast in weather patterns. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 29°C (84°F), with an average of 15°C (60°F), making it a more temperate month overall. However, it experiences around 61 mm (2.4 in) of precipitation over 11 days, along with a humidity level of 81%. In contrast, June typically sees warmer temperatures, with a minimum of 6°C (42°F) and a peak reaching 34°C (94°F), averaging 18°C (65°F). The month is also wetter, recording 93 mm (3.7 in) of rain over 15 days, while maintaining a similar humidity level of 82%. These factors contribute to June being a hotter and more humid month than September. For a detailed overview of June's climate, you can check Bern weather in June.
When comparing the weather in September and July, it's clear that July tends to be warmer overall. In July, temperatures range from a minimum of 9°C (49°F) to a maximum of 36°C (97°F), with an average temperature of 20°C (68°F). In contrast, September sees cooler temperatures, with a range from 3°C (38°F) to 29°C (84°F) and an average of 15°C (60°F). Additionally, July experiences higher precipitation with 104 mm (4.1 in) over 14 days, compared to September's 61 mm (2.4 in) over 11 days. Both months have similar humidity levels, but July's heat makes it feel more oppressive. For more details, you can check out Bern weather in July.
In comparing the weather of September and August, September tends to be cooler, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F) and an average of 15°C (60°F). In contrast, August features warmer conditions, with a minimum of 8°C (47°F) and a maximum of 34°C (93°F), leading to an average of 19°C (67°F). Additionally, September experiences higher humidity at 81% despite lower overall precipitation levels of 61 mm (2.4 in) across 11 days, compared to August's 98 mm (3.8 in) over 12 days. For a more detailed look at August's climate, you can check out Bern weather in August.
In September, the weather starts to cool down with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 29°C (84°F), averaging around 15°C (60°F). This month sees about 61 mm (2.4 in) of precipitation spread over 11 days, alongside a relatively high humidity of 81%.
In contrast, October brings an even cooler climate, with temperatures dropping to a minimum of -2°C (29°F) and a maximum of 23°C (73°F). The average temperature for October settles around 11°C (51°F), and rainfall increases to 95 mm (3.7 in) across 13 days, accompanied by an even higher humidity level of 89%. For a closer look at the specifics, check out Bern weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a mild minimum of 3°C (38°F) to a warm average of 15°C (60°F) and can peak at 29°C (84°F). The month experiences relatively moderate precipitation of 61 mm (2.4 in) over 11 days, with humidity around 81%. In contrast, November sees a notable drop in temperatures, with minimums dipping to -4°C (25°F) and an average of just 5°C (41°F), while the maximum remains a comfortable 20°C (69°F). Precipitation increases slightly to 72 mm (2.8 in) over 12 days, accompanied by higher humidity levels at 89%. For more details on November weather specifics, you can check Bern weather in November.
September weather is characterized by a broader temperature range, with minimums around 3°C (38°F) and maximums reaching up to 29°C (84°F). This month experiences an average temperature of 15°C (60°F) and sees about 61 mm (2.4 in) of precipitation over 11 days, accompanied by relatively high humidity at 81%. In contrast, December temperatures drop significantly, with minimums plunging to -6°C (21°F) and an average of just 2°C (37°F). The month also witnesses increased precipitation, totaling 125 mm (4.9 in) over 18 days, and humidity rises to 91%. For more detailed information on the conditions in December, check out Bern weather in December.
As summer transitions into autumn, September in Bern presents a unique blend of warm days and crisp evenings. Unlike the hotter months of July and August, where temperatures soar, September boasts a pleasant average temperature of 15°C, making it ideal for outdoor activities amidst the stunning fall foliage. However, travelers should be prepared for increased precipitation with about 11 days of rain, adding a refreshing touch to the landscape but also implying that umbrellas might be necessary. With humidity levels around 81%, the air feels a bit more robust, giving visitors a true taste of Bern's changing seasons. For more detailed insights into the climate, please visit Bern Climate.