Last updated: August 27, 2025
In September, Pontresina, Switzerland, experiences a dynamic range of weather characterized by a maximum temperature reaching 19°C (66°F), an average of 7°C (44°F), and a minimum plummeting to -13°C (9°F). The month is notably wet, with 109 mm (4.3 in) of precipitation spread over approximately 14 days, contributing to a humid atmosphere with an average humidity of 83%. Visitors can expect a blend of crisp mountain air and occasional rain, making it a unique time to enjoy the majestic scenery of the Swiss Alps.
As September rolls into Pontresina, Switzerland, the landscape begins to transition from the warmth of summer to the chill of autumn. Temperatures in this alpine region showcase a moderate shift, with minimums dipping to -13°C (9°F) and averages settling around 7°C (44°F). The days remain pleasant with maximums reaching up to 19°C (66°F), allowing for comfortable exploration of the stunning mountain scenery. This month marks a notable change from the balmy heights of summer, suggesting that visitors should embrace layers to stay warm while soaking in the vibrant autumn hues that begin to color the mountainsides. As the crisp air settles in, September in Pontresina offers a serene yet invigorating experience, perfect for outdoor enthusiasts and nature lovers alike.
In September, Pontresina experiences a notable transition, receiving 109 mm (4.3 in) of precipitation over 14 days. This places September in the midst of a progressive trend in precipitation as the region moves from the warm summer months towards the cooler fall season. Following the notably wetter August, which recorded its highest levels of rain for the year at 160 mm (6.3 in), September's rainfall serves as a reminder of the lingering summer storms before the fall sets in. With the combination of cooler temperatures and increasing precipitation, this month represents a pivotal shift, setting the stage for the deeper autumn months that follow.
In September, humidity in Pontresina, Switzerland, sits at a moderate 83%, continuing a slight upward trend as the summer months transition into autumn. Following a consistent pattern throughout the year, where humidity levels are typically highest during the winter months – peaking at 92% in January – September marks a shift from the drier summer, which saw humidity drop to 80% in both May and August. As autumn approaches, humidity begins to climb again, signaling a return to the wetter months ahead, with values reaching 90% by October. This gradual increase provides a refreshing contrast to the warmth of summer, creating a unique atmospheric blend as nature prepares for the colder season.
In September, Pontresina experiences a UV Index of 8, categorized as very high, which signifies that sun exposure becomes increasingly critical as summer wanes. With a burn time of just 15 minutes, it’s essential for residents and visitors alike to take precautions against harmful ultraviolet radiation. This trend shows a gradual decrease from the extreme levels observed in June and July, but it still necessitates vigilance when enjoying the beautiful early autumn days. As the days shorten and temperatures begin to cool, the need for sun protection remains paramount; understanding these seasonal shifts can help ensure a safe and enjoyable outdoor experience. For more details, check out the Pontresina UV Index.
UV Risk Categories
In Pontresina, Switzerland, September marks a transition from the sun-drenched days of summer to the crispness of autumn, with an impressive 315 hours of sunshine illuminating the picturesque landscapes. This month beautifully bridges the peak sunny months of June and July, which boast over 389 and 414 hours, respectively, showcasing a gradual, yet noticeable, decline in sunlight as the year progresses. As the brilliant rays of summer give way to the softer light of fall, September still offers ample opportunities for hiking and exploring the stunning Alps, making it an ideal time for both adventure and relaxation amidst nature's changing palette.
In Pontresina, Switzerland, the likelihood of sunny weather in September is relatively moderate at 29%. As summer transitions into autumn, the chance of sunshine decreases slightly compared to the sunnier months of July and August, which enjoy rates around 31% and 36%, respectively. This gradual decline reflects a broader trend observed throughout the year, where winter months like January and February experience significantly lower probabilities of sunshine, hovering around 20% and 40%. September represents a transitional period, where the lingering warmth of summer begins to wane, hinting at the crispness of fall ahead. Nevertheless, as nature prepares for the change, those in Pontresina might still find moments of delightful sun, making it a charming time to explore the breathtaking landscapes.
In September, Pontresina begins to transition from the long, sun-soaked days of summer toward the shorter daylight hours of autumn. With approximately 12 hours of daylight, the month marks a gentle decline from the summer's peak, where daylight extended up to 15 hours in June, July, and August. As the leaves start to turn and the air cools, the remaining light still offers plenty of time for outdoor adventures amidst the breathtaking alpine scenery. This gradual decrease continues into October, reinforcing the rhythm of seasonal change as the days shorten ahead of winter.
As summer gently gives way to autumn, September in Pontresina, Switzerland, is characterized by a softening of the winds. With an average wind speed of just 1.2 m/s (3 mph), this month is among the calmest of the year, echoing the tranquil transition in the alpine landscape. Notably, September marks a decrease in wind intensity, following a steady 1.7 m/s (4 mph) during the peak summer months of June through August. As nature prepares for the upcoming chill of winter, the breezy whispers of September offer a serene backdrop for those seeking to immerse themselves in the breathtaking beauty of the Swiss Alps.
Weather in Pontresina varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Pontresina, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present strikingly different weather conditions. In September, temperatures exhibit a more moderate range, with a minimum of -13°C (9°F), an average of 7°C (44°F), and a maximum of 19°C (66°F). The month also sees considerable precipitation, totaling 109 mm (4.3 in) over approximately 14 days, with a humidity level of 83%. In contrast, January brings much colder temperatures, with a minimum of -29°C (-20°F), an average of -11°C (12°F), and a maximum of just 2°C (35°F). The precipitation during this month is lower at 67 mm (2.6 in) and occurs over 9 days, complemented by a slightly higher humidity of 92%. For more details on conditions during this winter month, you can check Pontresina weather in January.
In September, the weather experiences a gradual warmth with average temperatures around 7°C (44°F), peaking at a pleasant 19°C (66°F) and dipping to a minimum of -13°C (9°F). This month sees significant precipitation, approximately 109 mm (4.3 in) spread over 14 days, accompanied by a humidity level of 83%. In contrast, February presents a much colder climate, with average temperatures dropping to -8°C (18°F), with lows reaching -30°C (-21°F) and highs only reaching 5°C (42°F). The precipitation in February is lower, totaling around 52 mm (2.1 in) over 10 days, but the humidity is slightly higher at 89%. For more details on February weather, visit Pontresina weather in February.
In comparing the weather of September and March, September presents milder conditions with an average temperature of 7°C (44°F) and a maximum of 19°C (66°F), while March is notably colder, featuring an average of -5°C (23°F) and a maximum of 11°C (51°F). September experiences more precipitation overall, with 109 mm (4.3 in) spread across 14 days, compared to March’s 77 mm (3.0 in) over 12 days. Humidity levels are somewhat higher in March at 87%, compared to 83% in September, contributing to the chillier atmosphere typical of early spring. For a more detailed look at the climate specifics, you can visit Pontresina weather in March.
When comparing the weather in September and April, notable differences emerge in temperature and precipitation patterns. In September, temperatures tend to be milder, ranging from a minimum of -13°C (9°F) to a maximum of 19°C (66°F), with an average of 7°C (44°F). The month sees a total precipitation of 109 mm (4.3 in) across about 14 days, and humidity levels sit at around 83%. In contrast, April experiences colder conditions, with temperatures dipping to a minimum of -16°C (4°F) and peaking at 12°C (54°F), leading to an average temperature of -1°C (31°F). This month has less precipitation at 82 mm (3.2 in), occurring over approximately 11 days, and a slightly higher humidity at 84%. For more specific details about April weather, you can check Pontresina weather in April.
When comparing the weather in September and May, several notable differences emerge. September typically experiences a milder temperature range, with an average of 7°C (44°F) and a max of 19°C (66°F), whereas May is slightly cooler, featuring an average temperature of 4°C (39°F) and a maximum of 18°C (65°F). In terms of precipitation, May tends to be wetter, receiving about 133 mm (5.2 in) over 21 days compared to September's 109 mm (4.3 in) across 14 days. Humidity levels are also comparable, with September at 83% and May slightly lower at 80%. For a more detailed overview of May weather, you can check Pontresina weather in May.
In comparing the weather of September and June, we find significant differences in temperature and precipitation. September averages a cooler 7°C (44°F), with a minimum of -13°C (9°F) and a maximum of 19°C (66°F), while June enjoys milder conditions, boasting an average temperature of 10°C (50°F), with a minimum of -3°C (27°F) and a maximum reaching 24°C (76°F). Additionally, both months experience ample precipitation, with September receiving around 109 mm (4.3 in) over approximately 14 days, and June slightly wetter at 120 mm (4.7 in) across 18 days. Humidity levels remain relatively similar, with September at 83% and June at 82%. For more detailed insights, you can refer to Pontresina weather in June.
In September, temperatures in Pontresina range from a chilling minimum of -13°C (9°F) to a comfortable maximum of 19°C (66°F), resulting in an average temperature of 7°C (44°F). In contrast, July experiences much warmer weather, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 24°C (75°F), and an average of 11°C (52°F). Precipitation is slightly higher in September, totaling 109 mm (4.3 in) over 14 days, while July sees 133 mm (5.2 in) of rain across 21 days. Both months maintain a consistent humidity level of 83%. For more detailed insights on July weather, refer to Pontresina weather in July.
September weather shows a noticeable shift compared to August, as temperatures decline with a minimum of -13°C (9°F) and an average of 7°C (44°F), compared to August's milder minimum of 0°C (33°F) and an average of 11°C (52°F). The maximum temperature in September reaches only 19°C (66°F), whereas August enjoys slightly warmer days with a maximum of 22°C (71°F). Precipitation also varies, with September experiencing 109 mm (4.3 in) over 14 days, while August sees higher rainfall at 160 mm (6.3 in) across 19 days. Despite September having slightly higher humidity at 83% compared to August's 80%, the overall trend suggests a transition to cooler and more variable weather in September. For more detailed insights, you can check Pontresina weather in August.
September and October present notable differences in weather patterns. In September, temperatures range from a minimum of -13°C (9°F) to a maximum of 19°C (66°F), with an average temperature of 7°C (44°F). The month experiences 109 mm (4.3 in) of precipitation over 14 days and maintains a humidity level of 83%. In contrast, October sees slightly colder temperatures, with a minimum of -12°C (11°F) and a maximum of 14°C (58°F), resulting in an average temperature of 2°C (37°F). Precipitation increases to 126 mm (5.0 in) over 10 days, and humidity rises to 90%. For more details on weather trends in October, check out Pontresina weather in October.
In September, temperatures in Pontresina range from a minimum of -13°C (9°F) to a maximum of 19°C (66°F), with an average temperature of 7°C (44°F). The month experiences 109 mm (4.3 in) of precipitation over about 14 days, with humidity levels around 83%. In contrast, November sees a significant drop in temperatures, with lows reaching -23°C (-9°F) and highs only reaching up to 9°C (48°F), resulting in an average of -4°C (25°F). Precipitation increases slightly to 123 mm (4.8 in) over 13 days, and humidity rises to 88%. As you can see, November brings colder temperatures and higher humidity compared to September. For more details, check out Pontresina weather in November.
September and December present contrasting weather patterns. In September, temperatures range from a chilly -13°C (9°F) at night to a mild 19°C (66°F) during the day, with an average of 7°C (44°F). Precipitation is substantial, totaling 109 mm (4.3 in) over 14 days, and humidity hovers around 83%. In stark contrast, December sees much colder temperatures, with minima plummeting to -26°C (-15°F) and a maximum of only 2°C (36°F), averaging -9°C (16°F). Although December's precipitation slightly increases to 116 mm (4.6 in) over the same number of days, the humidity rises to 90%, contributing to the winter chill. For a detailed look at December weather in the area, visit Pontresina weather in December.
As September unfolds in Pontresina, it brings a unique blend of cool temperatures and increased precipitation that sets it apart from the milder summer months. With an average temperature of 7°C, the days begin to chill, while nights can dip unexpectedly, reminding us of the impending autumn. Frequent rainy days add to the 83% humidity, creating a distinct atmosphere that feels both refreshing and invigorating. This month’s weather patterns signify the transition into a more dramatic seasonal scenery, encouraging visitors to embrace the stunning alpine landscape while preparing for the cooler days ahead. For a deeper look into the yearly weather trends, be sure to explore Pontresina Climate.