September weather forecast
Montana, USA

September marks the beginning of the transition from summer to autumn in Montana, with temperatures gradually declining and the weather showing signs of change. The variations between the western and eastern regions of the state continue to be influenced by the topography and geography.

The minimum temperature in September ranges from 40°F (4.4°C) to 50°F (10°C), while the maximum temperature generally falls between 65°F (18.3°C) and 75°F (23.9°C). The cooling trend becomes more apparent, especially towards the latter part of the month.

Snow is still unlikely in September, though the highest peaks may start to see early snowfall. Rain becomes more common, particularly in the western part of the state, and thunderstorms lessen in frequency.

Compared to August, September brings a noticeable shift in weather, with shorter days and cooling temperatures signaling the approach of autumn. The landscapes begin to change as well, with leaves starting to turn color and the lush greenery of summer giving way to the hues of fall.

Tourism remains active in September, though the numbers may start to decline compared to the peak summer months. The mild weather still permits a wide range of outdoor activities, and the changing scenery adds a unique charm to the state's natural beauty.

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• Billings - September »
  In Billings during September, the rain falls for 9.1 days and regularly aggregates up to 0.98" (25mm) of precipitation. On the last day of September, in Billings, sunrise is at 7:12 am and sunset at 6:55 pm MDT.
• Missoula - September »
  In Missoula, during September, the rain falls for 4.2 days and regularly aggregates up to 0.24" (6mm) of precipitation. The month of September in Missoula heralds the arrival of autumn, as temperatures dalliance towards lower measurements.
• Great Falls - September »
  In Great Falls in September, it is raining for 5.3 days, with typically 0.31" (8mm) of accumulated precipitation. On the last day of September, in Great Falls, sunrise is at 7:23 am and sunset at 7:05 pm MDT.
• Bozeman - September »
  In Bozeman, in September, during 11.2 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. September is the first month it typically snows in Bozeman, Montana.
• Butte - September »
  In Butte, in September, during 8.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Butte, in September, during 8.5 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.
• Helena - September »
  In Helena in September, it is raining for 8.1 days, with typically 0.94" (24mm) of accumulated precipitation. On the first day of September in Helena, sunrise is at 6:49 am and sunset at 8:06 pm.
• Kalispell - September »
  In Kalispell during September, the rain falls for 8.6 days and regularly aggregates up to 0.91" (23mm) of precipitation. In Kalispell, in September, during 8.6 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.
• Havre - September »
  On the first day of September in Havre sunrise is at 6:37 am and sunset at 7:59 pm. In Havre, in September, during 7 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.
• Anaconda - September »
  On the last day of September, in Anaconda, Montana, sunrise is at 7:30 am and sunset at 7:12 pm MDT. In September, in Anaconda the rain falls for 9.9 days.
• Miles City - September »
  In Miles City in September, during 6.7 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. On the last day of September, in Miles City sunrise is at 7:01 am and sunset at 6:44 pm MDT.
• Belgrade - September »
  In Belgrade in September, during 10.7 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Belgrade in September, it is raining for 10.7 days, with typically 1.42" (36mm) of accumulated precipitation.
• Livingston - September »
  Livingston in September experiences a subtle temperature decline, with average high-temperatures reducing from a moderately hot 84.9°F (29.4°C) in August to an agreeable 73°F (22.8°C). What time are sunrise and sunset in September in Livingston?