Last updated: February 24, 2025
Experience the enchanting September weather of Mount Crested Butte, United States, where the average temperature hovers around a refreshing 10°C (50°F). Daytime highs can reach up to a delightful 25°C (77°F), perfect for exploring the stunning mountain vistas, while nighttime dips to a brisk -7°C (20°F) create a cozy atmosphere. September brings approximately 33 mm (1.3 in) of precipitation over 7 days, contributing to the vibrant fall colors that paint the landscape. With an average humidity of 65%, this charming destination is an ideal backdrop for outdoor adventures and serene escapes, capturing the essence of the transition from summer to autumn.
In September, Mount Crested Butte begins to transition from summer warmth to the crispness of fall. With minimum temperatures averaging around -7°C (20°F) and maximums reaching a pleasant 25°C (77°F), the climate is marked by a refreshing chill, perfect for outdoor adventures. The average temperature settles at a comfortable 10°C (50°F), providing a balanced atmosphere for both hiking and enjoying the beautiful fall foliage. This month notably contrasts with the winter chill that follows, making it an ideal time to experience the breathtaking landscapes before they are blanketed in snow. As the days shorten and the air cools, September serves as a gentle reminder of the seasonal change, enticing visitors to embrace the beauty of nature in transition.
September in Mount Crested Butte marks a subtle transition in precipitation patterns, as the mountain town receives an average of 33 mm (1.3 in) of moisture spread across about 7 days. This is a slight uptick from the drier summer months of June and August, which recorded only 27 mm (1.1 in) and 30 mm (1.2 in), respectively. While not among the wetter months, September's precipitation begins to pave the way for the more substantial rainfall found in the fall, with the approaching October averaging 58 mm (2.3 in). This gradual shift not only signals the onset of autumn but also showcases the region's fluctuating climate, where each month plays a role in weaving together the vibrant tapestry of seasons in this picturesque alpine setting.
In September, Mount Crested Butte experiences a noticeable increase in humidity, reaching 65%, a slight uptick from the drier summer months. This change marks a transition as the region shifts from the low-point humidity of July and August—where levels dipped to as low as 52%—to the more moderate conditions typical of early autumn. As the warmth of summer gives way to the cool embrace of fall, humidity levels begin to rise again, signaling the approach of the wetter months ahead. This trend continues into October, where humidity climbs further to 76%, setting the stage for the seasonal changes that define this picturesque mountain town.
In September, Mount Crested Butte experiences a notable shift in UV exposure, with a UV Index of 10, placing it in the very high category and allowing for a burn time of just 15 minutes. This is a slight decrease from the peak summer months of June and July, which saw an extreme UV Index of 14 and 13 respectively. As temperatures begin to cool, September’s UV levels remain significant, highlighting the importance of sun protection even as the summer fades. This trend showcases a gradual decline from the highest UV index levels during the peak months, yet it still serves as a reminder that ultraviolet rays can be formidable throughout the fall. For more information, check out the detailed Mount Crested Butte UV Index.
UV Risk Categories
September in Mount Crested Butte heralds the beginning of autumn with a delightful farewell to summer sunshine. With 318 hours of sunlight, this month experiences a gentle decline from the peak brightness of July and June, yet it still boasts an impressive glow. The gradual reduction in daylight marks a transition, as vibrant fall hues begin to paint the landscape. Notably, the sunshine hours of September remain substantially higher than the chillier months that follow, such as October and November, offering locals and visitors alike a final opportunity to revel in the warm embrace of the sun before winter sets in. This beautiful blend of warmth and changing colors makes September a truly enchanting time in this mountain paradise.
When it comes to enjoying sunny weather in Mount Crested Butte, September stands out with a notable 69% chance of sunshine, making it one of the sunniest months of the year. This trend follows a gradual increase in sunlight from the summer months, peaking in August at 68%. As summer transitions into autumn, the probability of clear skies remains high, creating the perfect backdrop for outdoor activities and breathtaking fall colors. Following September, the likelihood of sunshine dips slightly in October, yet it still stays relatively strong at 55%. Overall, September not only marks the transition into fall but also offers the best chance for sunny days, making it an ideal time to soak in the natural beauty of this stunning Colorado town.
As September arrives in Mount Crested Butte, the days begin to shorten, offering 12 hours of daylight. This marks a slight decrease from the 13 hours experienced in August, as summer’s warmth gradually gives way to the crispness of autumn. The trend throughout the year reveals a fascinating ebb and flow of daylight; after the winter months of 9 hours in January and December, the light swiftly increases, reaching a peak of 14 hours in June and July. Following this summer zenith, the days begin to shorten again, with September acting as a gentle transition into the shorter daylight of fall. As the vibrant autumn colors emerge, the changing daylight serves as a reminder of nature's cyclical rhythm, inviting both reflection and adventure in the breathtaking landscapes of Colorado.
In September, Mount Crested Butte experiences a gentle caress of wind, with an average speed of 1.8 m/s (4 mph), continuing the trend of milder breezes seen in the late summer months. As the summer heat wanes, wind speeds show a slight decrease from 1.9 m/s in August, reflecting the transition into fall. This pattern aligns with the general tendency observed throughout the year, where winter months tend to bring slightly stronger winds, peaking at 2.2 m/s (5 mph) in mid-winter while summer months often feature the calmest conditions. September's soft winds invite outdoor enthusiasts to enjoy the breathtaking scenery without the hustle of stronger gusts, making it an idyllic time for hiking and exploration in this stunning mountain landscape.
The weather in Mount Crested Butte changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Mount Crested Butte and find detailed weather information for every month.
In September, temperatures range from a brisk minimum of -7°C (20°F) to a pleasant maximum of 25°C (77°F), with an average of 10°C (50°F). The month experiences relatively mild precipitation, totaling 33 mm (1.3 in) across about 7 days and humidity levels sitting around 65%. In stark contrast, January's weather is much harsher, with temperatures dipping as low as -24°C (-11°F) and averaging -9°C (17°F) with a maximum of just 5°C (42°F). Precipitation is heavier during this month, totaling 60 mm (2.4 in) over approximately 11 days, coupled with a significant increase in humidity at 88%. For more details, check out Mount Crested Butte weather in January.
September and February present strikingly contrasting weather patterns. In September, temperatures range from a mild -7°C (20°F) at night to a comfortable 25°C (77°F) during the day, with an average of 10°C (50°F). This month experiences relatively moderate precipitation of 33 mm (1.3 in) over about 7 days and a humidity level of 65%. In comparison, February is much colder, with temperatures dropping to a minimum of -25°C (-12°F), an average of -7°C (19°F), and a maximum of only 10°C (51°F). Precipitation in February increases significantly to 79 mm (3.1 in), spread across 14 days, and the humidity rises to 87%. For a more detailed overview of February's climate, you can visit Mount Crested Butte weather in February.
The weather in September is generally milder, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 25°C (77°F), averaging around 10°C (50°F). In contrast, March experiences significantly colder temperatures, with lows dipping to -21°C (-6°F) and highs reaching only 11°C (52°F), averaging -3°C (27°F). Additionally, March sees more precipitation, totaling 77 mm (3.0 in) over 14 days compared to September's 33 mm (1.3 in) over just 7 days. The humidity is also higher in March, at 81%, compared to 65% in September. For more specific weather details, you can check out Mount Crested Butte weather in March.
In comparing the weather of September and April, it’s evident that September boasts milder temperatures, with an average of 10°C (50°F) and maximums reaching up to 25°C (77°F), while April is much cooler, averaging just 0°C (32°F) and capping at 12°C (54°F). Precipitation is another notable difference; September receives less rain, totaling 33 mm (1.3 in) over 7 days, compared to April's 64 mm (2.5 in) spread across 13 days. Additionally, April experiences higher humidity levels at 76%, compared to September's 65%. For specific details on conditions during April, you can refer to Mount Crested Butte weather in April.
When comparing the weather in September and May, September enjoys a milder average temperature of 10°C (50°F), with a maximum reaching 25°C (77°F), while May has a cooler average of 4°C (39°F) and a maximum of 20°C (69°F). September also sees less precipitation, with 33 mm (1.3 in) over about 7 days, compared to May's 58 mm (2.3 in) across 10 days. Humidity levels are slightly higher in May at 66%, compared to September's 65%, indicating a similar level of moisture in the air. For more detailed insights into May's weather conditions, you can check Mount Crested Butte weather in May.
In comparing the weather of September and June, we see some notable differences. September experiences a broader temperature range, with a minimum of -7°C (20°F) and a maximum of 25°C (77°F), resulting in an average of 10°C (50°F). In contrast, June has slightly warmer temperatures, ranging from a minimum of -6°C (21°F) to a maximum of 26°C (79°F), leading to an average of 11°C (51°F). Both months have a relatively low amount of precipitation, with September receiving 33 mm (1.3 in) over 7 days, while June sees slightly less at 27 mm (1.1 in) over 6 days. Additionally, June benefits from lower humidity at 58% compared to September's 65%. For more detailed insights on June weather, you can refer to Mount Crested Butte weather in June.
In comparing the weather of September and July, September exhibits a wider temperature range, with minimums dropping to -7°C (20°F) and maximums reaching up to 25°C (77°F), averaging around 10°C (50°F). While it is relatively cooler than July, which has a minimum of 0°C (33°F) and a maximum of 26°C (80°F) with an average of 14°C (58°F), September also sees less precipitation at 33 mm (1.3 in) over 7 days compared to July's 61 mm (2.4 in) over 13 days. Additionally, September features a higher humidity level at 65%, while July maintains a lower humidity level of 52%. For a more detailed look at July's weather, you can check out Mount Crested Butte weather in July.
In comparing the weather of September and August, September presents a more pronounced drop in average temperatures, with a minimum of -7°C (20°F) compared to August's minimum of 2°C (35°F). While both months feature similar maximum temperatures, averaging around 25°C (77°F), September tends to feel cooler overall with an average temperature of 10°C (50°F) against August's 14°C (57°F). Precipitation levels are slightly higher in September, at 33 mm (1.3 in) compared to August's 30 mm (1.2 in), though both months see precipitation on 7 days. Additionally, humidity is slightly higher in September at 65%, compared to 56% in August. For a more detailed look at August conditions, check out Mount Crested Butte weather in August.
In September, temperatures in Mount Crested Butte range from a chilly minimum of -7°C (20°F) to a pleasant maximum of 25°C (77°F), with an average of 10°C (50°F). The month sees around 33 mm (1.3 in) of precipitation over approximately 7 days, resulting in a relatively mild humidity level of 65%. In contrast, October experiences significantly colder temperatures with a minimum of -32°C (-25°F) and an average of 2°C (35°F), peaking at 19°C (67°F). The increase in precipitation to 58 mm (2.3 in) over 10 days also reflects a shift in weather patterns, contributing to a higher humidity of 76%. For more detailed insights into October's weather, visit Mount Crested Butte weather in October.
September generally offers mild temperatures, with daily averages around 10°C (50°F), peaking at a comfortable 25°C (77°F) during the day. The month experiences moderate precipitation, totaling 33 mm (1.3 in) over about 7 days, with humidity levels around 65%. In contrast, November brings a significant drop in temperatures, with averages at -5°C (23°F) and maximums only reaching up to 13°C (56°F). This month is characterized by chillier conditions, with lows plunging to -28°C (-19°F) and increased precipitation of 49 mm (1.9 in) spread over 8 days, accompanied by higher humidity at 82%. For a more detailed look at November conditions, you can visit Mount Crested Butte weather in November.
In September, temperatures range from a chilly minimum of -7°C (20°F) to a pleasant maximum of 25°C (77°F), with an average of 10°C (50°F). The month sees about 33 mm (1.3 in) of precipitation over 7 days, and humidity is relatively comfortable at 65%. In stark contrast, December experiences a considerable drop in temperatures, with minimums plunging to -30°C (-22°F) and a maximum of only 8°C (47°F), averaging around -9°C (16°F). This winter month has increased precipitation at 67 mm (2.6 in) over 11 days and significantly higher humidity levels at 89%. For more detailed insights on December weather, check Mount Crested Butte weather in December.
As September unfolds in Mount Crested Butte, the weather presents a delightful transition from the warmth of summer to the crispness of autumn. With daytime temperatures reaching a pleasantly mild 25°C (77°F) and dipping significantly at night, the month offers a unique blend of warm sunny days and cool evenings, making it perfect for outdoor activities. Compared to the heavier precipitation earlier in the summer, September's rainfall is relatively light, accumulating around 33 mm (1.3 in) over just a week, allowing for more clear skies. The added humidity of 65% helps maintain a refreshing atmosphere as the vibrant fall colors begin to emerge. For those planning a visit, September is an ideal time to experience the changing landscape. To learn more about how the weather varies throughout the year, check out Mount Crested Butte Climate.