Last updated: August 27, 2025
September in Grächen, Switzerland offers a blend of crisp mountain air and refreshing weather transitions. With maximum temperatures reaching a pleasant 21°C (70°F) and an average of 8°C (47°F), visitors can enjoy the crispness of early autumn. However, be prepared for cooler evenings, with lows dipping to -6°C (22°F). This month sees a fair amount of precipitation, totaling 89 mm (3.5 in) over 13 days, contributing to the lush scenery and vibrant fall colors. Humidity levels hover around 83%, enriching the stunning alpine landscapes while also reminding travelers to pack for the varying conditions. Whether you're hiking among the autumn leaves or sipping hot cocoa by the fire, September in Grächen is a delightful experience for all.
In Grachen, Switzerland, September marks a delightful transition from the warmer summer months to the crispness of fall. Temperatures during this time range from a chilly -6°C (22°F) at night to a pleasant 21°C (70°F) during the day, showcasing a significant shift yet retaining a mild charm. The average temperature hovers around 8°C (47°F), indicating that while the summer warmth is fading, the beautiful alpine landscape remains inviting for outdoor activities. As the month progresses, the cooler nights and warm days create a stunning backdrop for hiking and enjoying the breathtaking scenery, making September a particularly enchanting time to experience the Swiss Alps.
In September, Grachen experiences a moderate blend of rainfall, with precipitation amounting to 89 mm (3.5 in) over approximately 13 days. This marks a slight decrease from the wetter months of July (108 mm) and August (119 mm), suggesting the tail end of summer's precipitation pattern. The consistent rainfall throughout the month sets the stage for the rich autumn foliage, as the region transitions to the bountiful, wetter October, where it typically receives 148 mm (5.8 in) over just 11 days. This trend reflects a gradual shift from the warm summer showers to the more substantial autumn downpours, illustrating Grachen's dynamic climate in early fall.
As September unfolds in Grachen, Switzerland, the humidity levels settle at 83%, marking a slight increase from the previous month’s 80%. This transition reflects a subtle shift in weather patterns as the summer warmth gradually gives way to the crispness of autumn. Throughout the year, humidity in Grachen typically peaks during the winter months, reaching its highest levels at 92% in January and tapering down to its yearly low of 80% in May and August. Interestingly, September's humidity aligns closely with the more humid summer months, suggesting that the lingering warmth may still influence the air's moisture content. As autumn approaches, residents can expect a refreshing yet pleasantly humid ambiance that characterizes this scenic Swiss town.
In September, Grachen experiences a UV Index of 7, placing it in the high exposure category with a burn time of 25 minutes. This marks a noticeable decrease from the peak summer months, where indices climbed as high as 11 in June. As the season transitions into autumn, the UV Index gradually tapers off, similar to the patterns seen in October, which maintains a high index of 6. It's important for residents and visitors alike to stay vigilant, as even in September, the sun’s rays can still cause harm, making sun protection essential. For more detailed information on UV levels throughout the year, visit the Grachen UV Index.
UV Risk Categories
As September rolls in, Grachen, Switzerland continues to bask in the afterglow of summer with 323 hours of sunshine, a notable drop from the peak brightness of July yet still vibrant enough to inspire outdoor adventures. The month reflects a gradual transition into autumn, following a splendid summer where June and July celebrated the most sunlight with 388 and 416 hours, respectively. August starts to wind down, but September retains a healthy glow, outperforming the chill of October and even the bleakness of November. The steady descent from summer's zenith invites both relaxation and exploration, making September a captivating time to witness the changing colors of the Swiss landscape under the warm embrace of lingering sunshine.
September in Grachen, Switzerland, offers a moderate chance of sunny weather, with the likelihood of clear skies sitting at 25%. This marks a slight decline from the summer months, where July and August enjoy higher probabilities of sunshine at 31% and 37% respectively. Following the vibrant warmth of summer, September's shift toward autumn begins to temper expectations for prolonged sunny days. Notably, as the seasons change, the sunshine probability in Grachen approaches a range akin to early spring, reminiscent of April's 40% chance. Thus, while September may not guarantee endless sunshine, it still carries the potential for delightful days that capture the essence of late summer in the Swiss Alps.
As summer gives way to autumn in Grachen, Switzerland, September ushers in a subtle shift in daylight duration, offering residents and visitors a delightful 12 hours of light each day. This month showcases a gentle decline from the 15 hours experienced during the peak summer months of June and July, marking a transition toward shorter days. Following the vibrant brightness of summer, September's daylight still provides ample time for outdoor adventures amid the stunning alpine landscapes, yet hints at the encroaching winter months. As the year progresses into October, daylight will further taper to 10 hours, reflecting the natural rhythm of the seasons and inviting opportunities for reflection and preparation for winter's embrace.
In Grachen, Switzerland, September heralds the tail end of summer, with average wind speeds gently declining to 0.9 m/s (2 mph). This marks the lowest point for the year, following a steady pattern of reduced winds during the summer months. From June through September, the wind speeds gradually taper off, reflecting the calm and serene atmosphere as the region transitions into autumn. Interestingly, the shift in wind dynamics indicates a growing stillness, giving way to the tranquil beauty of autumn foliage and the crispness that comes with October's return to slightly brisker breezes at 1.3 m/s (3 mph). Overall, September's soft winds embrace the onset of change, inviting visitors to experience the peaceful charm of this alpine paradise as summer waves goodbye.
Weather in Grachen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grachen, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January exhibit strikingly different weather conditions. In September, temperatures range from a minimum of -6°C (22°F) to a pleasant average of 8°C (47°F), peaking at a comfortable 21°C (70°F). The month sees about 89 mm (3.5 in) of precipitation over 13 days, with humidity levels averaging 83%. In contrast, January brings much colder weather, with temperatures plummeting to a low of -27°C (-17°F) and averaging -10°C (15°F), while the maximum is merely 5°C (41°F). Although January has slightly more precipitation at 125 mm (4.9 in) spread across 11 days, humidity rises to 92%, contributing to the frigid feel. For more detailed insights about January's weather, you can visit Grachen weather in January.
In comparing the weather between September and February, it's evident that September offers a milder climate with average temperatures ranging from -6°C (22°F) to a pleasant high of 21°C (70°F), whereas February struggles with much colder conditions, with temperatures plummeting to a minimum of -24°C (-10°F) and only reaching a maximum of 9°C (48°F). September experiences slightly more precipitation, totaling 89 mm (3.5 in) over 13 days, compared to February's 82 mm (3.2 in) across 12 days, although the humidity is marginally higher in February at 89%. For those interested in specific February conditions, you can explore more about Grachen weather in February.
When comparing the weather in September and March, one can observe notable differences in temperature and precipitation. September experiences milder temperatures, ranging from a minimum of -6°C (22°F) to a comfortable maximum of 21°C (70°F), with an average of 8°C (47°F). In contrast, March is significantly colder, with temperatures dipping to a minimum of -25°C (-12°F) and only rising to a maximum of 12°C (53°F), resulting in an average of -3°C (27°F). Additionally, while September sees around 89 mm (3.5 in) of precipitation over 13 days, March is wetter with 109 mm (4.3 in) falling over 15 days. Humidity levels are relatively high in both months, reaching 83% in September and 87% in March, indicating a damp chill in late winter. For a detailed look at March weather patterns, refer to Grachen weather in March.
In comparing the weather between September and April, we see a notable contrast in temperatures and conditions. September features a broader temperature range, with minimums around -6°C (22°F) and maximums peaking at 21°C (70°F), offering a more temperate feel with an average of 8°C (47°F). In contrast, April is significantly colder, with temperatures dipping to a minimum of -17°C (2°F) and a maximum of only 15°C (59°F), yielding an average of just 1°C (34°F).
Both months experience similar precipitation levels, each receiving 89 mm (3.5 in), but September has 13 rain days compared to April's 11 days. Interestingly, both months boast high humidity, with September at 83% and April slightly higher at 84%. For a closer look at the specifics of April's weather, you can check out Grachen weather in April.
When comparing the weather in September to that of May, several notable differences emerge. September enjoys milder temperatures, with an average of 8°C (47°F) and a maximum of 21°C (70°F), while May tends to be cooler, averaging 5°C (41°F) and peaking at 20°C (67°F). In terms of precipitation, May is the wetter month with 149 mm (5.9 in) falling over 20 days, compared to September’s 89 mm (3.5 in) across 13 days. Humidity levels are relatively high in both months, with September slightly more humid at 83% compared to May’s 80%. For those looking for specific information on May weather, you can check out Grachen weather in May.
In comparing the weather of September and June, September tends to be cooler overall, with average temperatures ranging from a minimum of -6°C (22°F) to a maximum of 21°C (70°F), while June sees higher averages, with minimums around -3°C (26°F) and maximums reaching 26°C (78°F). Precipitation is more frequent in June, occurring over 17 days with a total of 130 mm (5.1 in), compared to September's 89 mm (3.5 in) over 13 days. Interestingly, both months exhibit high humidity levels, with September at 83% and June slightly lower at 82%. For more detailed insights, you can check the Grachen weather in June.
In comparing the weather between July and September, a few notable differences emerge. July tends to be warmer, with average temperatures ranging from a low of 0°C (33°F) to a high of 25°C (76°F), while September sees temperatures drop significantly to a range of -6°C (22°F) at night and a maximum of 21°C (70°F) during the day. Precipitation levels are slightly higher in July, with 108 mm (4.2 in) over 16 days, compared to September's 89 mm (3.5 in) over 13 days. Despite the differing temperatures and precipitation, both months maintain a consistent humidity level of 83%. For a closer look at July weather specifics, you can visit Grachen weather in July.
September weather in Grachen presents a noticeable shift from August, with temperatures dropping from a minimum of 0°C (33°F) in August to a chilly -6°C (22°F) in September. The average temperature also decreases from 12°C (54°F) in August to 8°C (47°F), while the maximum temperature sees a reduction from 24°C (76°F) to 21°C (70°F). Precipitation is slightly lower in September at 89 mm (3.5 in) over 13 days, compared to August's 119 mm (4.7 in) over 16 days. Interestingly, September also has a higher humidity level at 83%, compared to 80% in August. For more details, check out the weather specifics here: Grachen weather in August.
September and October present a notable shift in weather conditions. In September, the temperatures range from a minimum of -6°C (22°F) to a maximum of 21°C (70°F), with an average of 8°C (47°F). The month experiences 89 mm (3.5 in) of precipitation over 13 days and an humidity level of 83%. Conversely, October sees cooler temperatures, with a minimum of -8°C (18°F), an average of 4°C (39°F), and a maximum of 16°C (61°F). Precipitation increases to 148 mm (5.8 in) over 11 days, along with a slight rise in humidity to 90%. For more detailed information about weather conditions, check out the Grachen weather in October.
In September, the weather tends to be milder, with average temperatures around 8°C (47°F), peaking at a comfortable 21°C (70°F). The month sees about 89 mm (3.5 in) of precipitation over 13 days, along with a humidity level of 83%. In contrast, November experiences a significant drop in temperature, with an average of -3°C (27°F) and maximums only reaching 12°C (55°F). This month is slightly wetter, accumulating 109 mm (4.3 in) of precipitation across 15 days, and humidity remains high at 88%. For a detailed look at November conditions, check out Grachen weather in November.
In September, the weather is notably milder, with temperatures ranging from a minimum of -6°C (22°F) to a maximum of 21°C (70°F) and an average of 8°C (47°F). This month sees moderate precipitation of 89 mm (3.5 in) spread over 13 days, accompanied by a humidity level of 83%. In contrast, December brings a stark drop in temperatures, with a minimum of -28°C (-18°F) and an average of -8°C (17°F), peaking at just 5°C (42°F). The precipitation increases significantly to 170 mm (6.7 in) over 17 days, while humidity rises slightly to 90%. For a more detailed look at December weather in Grachen, check out Grachen weather in December.
In September, Grachen experiences a distinct transition into autumn, marked by cooler temperatures and increased humidity. While the maximum temperature reaches a pleasant 21°C (70°F) during the day, the nights can be brisk as they dip to a cooler -6°C (22°F). This month also sees about 89 mm (3.5 in) of precipitation spread over 13 days, indicating more frequent rain compared to the summer months. With an average humidity of 83%, September presents a refreshing yet sometimes rainy atmosphere that invites visitors to enjoy the stunning fall foliage and the crisp mountain air. For a deeper dive into Grachen's weather patterns throughout the year, check out Grachen Climate.