September weather forecast
Colorado, USA

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Flag of Colorado, USA
Flag of Colorado, USA

Weather in September

September in Colorado signifies the onset of autumn, with noticeable changes in temperature and the landscape's appearance. Temperatures in areas like the Eastern Plains usually range from 50°F (10°C) to 75°F (23.9°C), showcasing a significant decrease from the summer's peak warmth.

The Front Range cities, including Colorado Springs, start to experience cooler nights and milder days. Meanwhile, the high mountain regions witness the beginning of the fall foliage season, as the aspen trees turn golden, creating a picturesque setting for outdoor exploration.

September brings a reduction in the frequency and intensity of thunderstorms, with precipitation often occurring in the form of light rain. The state's climate becomes less volatile, offering a reprieve from the summer's occasional severe weather patterns.

Snow may make an early appearance in the higher elevations towards the end of the month, hinting at the approaching winter. However, it is typically sporadic and does not impact most of the state's recreational activities.

September's weather embodies the transitional nature of autumn in Colorado, with a gradual cooling of temperatures and the emergence of fall colors. The shift away from the hot, stormy conditions of summer towards the more temperate and stable climate of fall makes this month an attractive time for outdoor pursuits and enjoying Colorado's diverse natural beauty.

  • Denver - September »
    Therefore, Denver's September weather notably moves from the summer heat towards milder, comfortable days of early fall. 
 
 September's arrival signals a moderate reduction in the average high-temperature, easing from 83.1°F (28.4°C) in August to a still moderately hot 76.6°F (24.8°C). In Denver in September, it is raining for 9.5 days, with typically 0.71" (18mm) of accumulated precipitation.
  • Colorado Springs - September »
    In Colorado Springs in September, during 10.5 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. On the first day of September in Colorado Springs, sunrise is at 6:28 am and sunset at 7:30 pm.
  • Aurora - September »
    On the first day of September in Aurora sunrise is at 6:27 am and sunset at 7:31 pm. In Aurora snow does not fall in June through September.
  • Fort Collins - September »
    In Fort Collins during September, the rain falls for 6.3 days and regularly aggregates up to 0.55" (14mm) of precipitation. June, August and September, with an average relative humidity of 45%, are the least humid months in Fort Collins.
  • Boulder - September »
    June, August and September, with an average relative humidity of 45%, are the least humid months in Boulder. June, August and September, with an average relative humidity of 45%, are the least humid months in Boulder.
  • Pueblo - September »
    In Pueblo snow does not fall in June through September. In Pueblo, during September, the rain falls for 7.6 days and regularly aggregates up to 0.55" (14mm) of precipitation.
  • Greeley - September »
    On the first day of September in Greeley sunrise is at 6:26 am and sunset at 7:31 pm. The arrival of September in Greeley corresponds with a minor reduction in the average high-temperature, down from August's tropical 87.8°F (31°C) to a moderately hot 79.7°F (26.5°C).
  • Longmont - September »
    In Longmont snow does not fall in June through September. In Longmont, snow does not fall in June through September.
  • Grand Junction - September »
    In September, Grand Junction ushers in the first hints of autumn as temperatures start to decrease. As Grand Junction enters September, the average high-temperature subtly lowers from the 84.2°F (29°C) of August to a still warm 76.5°F (24.7°C).
  • Broomfield - September »
    In Broomfield, during September, the rain falls for 7.7 days and regularly aggregates up to 0.35" (9mm) of precipitation. On the first day of September in Broomfield, sunrise is at 6:28 am and sunset at 7:32 pm.
  • Castle Rock - September »
    June and September, with an average relative humidity of 45%, are the least humid months in Castle Rock, Colorado. In Castle Rock, Colorado, snow does not fall in July through September.
  • Commerce City - September »
    In Commerce City, Colorado, snow does not fall in June through September. In Commerce City, Colorado, in September, during 3.3 rainfall days, 0.16" (4mm) of precipitation is typically accumulated.
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Colorado, USA

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