September weather forecast and climate
Big Sky, MT

A beautiful view of the scenery in Big Sky, Montana, vast fields, and planted forests near the scenic mountainous region, scattered clouds above
A beautiful view of the scenery in Big Sky, Montana, vast fields, and planted forests near the scenic mountainous region, scattered clouds above

Temperature

In September, the average high-temperature is 68.5°F (20.3°C), and the average low-temperature is 32°F (0°C).

Rainfall

In Big Sky, Montana, 1.6" (39.9mm) of precipitation is typically accumulated. Throughout the year, 19.9" (506.1mm) of rain is accumulated.

Snowfall

Months with snowfall in Big Sky are January through July, September through December.

Daylight

In Big Sky, the average length of the day in September is 12.5h.

What is the temperature in September in Big Sky?

In September, the average high-temperature is 68.5°F (20.3°C), and the average low-temperature is 32°F (0°C).

How much does it rain in Big Sky in September?

Throughout September, 1.6" (39.9mm) of precipitation is accumulated.

When does it start to snow in Big Sky?

September is the first month it typically snows. Throughout September, Big Sky receives 0.3" (7.6mm) of snow.

How many hours of daylight does Big Sky have in September?

In September, the average length of the day in Big Sky, Montana, is 12.5h.
Average temperature in September - Big Sky, MT
  • Average high temperature in September: 68.6°F

The warmest month (with the highest average high temperature) is August (78°F).
The month with the lowest average high temperature is December (29.5°F).

  • Average low temperature in September: 32°F

The month with the highest average low temperature is July (40.1°F).
The coldest month (with the lowest average low temperature) is December (6.6°F).

Average rainfall in September - Big Sky, MT
  • Average rainfall in September: 1.6"

Wettest months (with the highest rainfall) are May and June (2.8").
Driest months (with the lowest rainfall) are February and March (1.2").

Average snowfall in September - Big Sky, MT
  • Average snowfall in September: 0.3"

The month with the highest snowfall is January (31.9").
The month with the lowest snowfall is August (0").

Average daylight in September - Big Sky, MT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

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