October weather forecast
Big Sky, MT

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Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana
Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana

Weather in October

October in Big Sky brings about a stronger presence of autumn, coupled with a quick return to colder temperatures. The charm of fall becomes even more pronounced, rendering the atmosphere picture-perfect. However, winter begins to sneak in, with snow making a comeback towards the month's end. October is a month of transformation - its weather changing the scenery from the russet tones of autumn to the white blanket of winter. It's a captivating interplay that contributes to Big Sky's fascinating weather dynamic.

Temperature

October in Big Sky signals a clear decrease in the average high-temperature, dropping from September's comfortable 63.5°F (17.5°C) to a frosty 45.5°F (7.5°C). In Big Sky, an average low-temperature of 27.5°F (-2.5°C) is recorded during October nights.

Humidity

In Big Sky, the average relative humidity in October is 71%.

Rainfall

In October, the rain falls for 8.3 days. Throughout October, 2.01" (51mm) of precipitation is accumulated. Throughout the year, there are 116.1 rainfall days, and 23.5" (597mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through December. In Big Sky, during October, snow falls for 13.8 days and regularly aggregates up to 12.44" (316mm) of snow. In Big Sky, during the entire year, snow falls for 151.6 days and aggregates up to 124.06" (3151mm) of snow.

Daylight

In Big Sky, the average length of the day in October is 10h and 56min.
On the first day of October, sunrise is at 7:24 am and sunset at 7:04 pm. On the last day of the month, sunrise is at 8:03 am and sunset at 6:13 pm MDT.

Sunshine

In October, the average sunshine in Big Sky is 6.6h.

UV index

In October, the average daily maximum UV index in Big Sky is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: In October, a daily maximum UV index of 2 leads to the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
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Frequently asked questions

What are October temperatures in Big Sky?

In October, the average high-temperature and low-temperature are 45.5°F (7.5°C) and 27.5°F (-2.5°C) respectively.

What is the average humidity in October in Big Sky?

The average relative humidity in October in Big Sky, Montana, is 71%.

How many days does it rain in October in Big Sky?

In Big Sky, in October, during 8.3 rainfall days, 2.01" (51mm) of precipitation is typically accumulated.

How much does it snow in Big Sky in October?

In Big Sky, in October, snow falls for 13.8 days, with typically accumulated 12.44" (316mm) of snow.

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

The average day length in October in Big Sky, Montana, is 10h and 56min.

When is the sunrise / sunset in October in Big Sky?

On the first day of October in Big Sky, sunrise is at 7:24 am and sunset at 7:04 pm. On the last day of the month, sunrise is at 8:03 am and sunset at 6:13 pm MDT.

How long on average sun shines in October in Big Sky?

In Big Sky, the average sunshine duration in October is 6.6h.

What is the UV index intensity in October in Big Sky?

In October, the average daily maximum UV index in Big Sky, Montana, is 2. A UV Index reading of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Big Sky, MT

Average temperature in October - Big Sky, MT
  • Average high temperature in October: 45.5°F

The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).

  • Average low temperature in October: 27.5°F

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (7.9°F).

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Average pressure in October
Big Sky, MT

Average pressure in October - Big Sky, MT
  • Average pressure in October: 30.06"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in October
Big Sky, MT

Average wind speed in October - Big Sky, MT
  • Average wind speed in October: 6.1mph

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in October
Big Sky, MT

Average humidity in October - Big Sky, MT
  • Average humidity in October: 71%

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).

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Average rainfall in October
Big Sky, MT

Average rainfall in October - Big Sky, MT
  • Average rainfall in October: 2.01"

The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").

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Average rainfall days in October
Big Sky, MT

Average rainfall days in October - Big Sky, MT
  • Average rainfall days in October: 8.3 days

The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in October
Big Sky, MT

Average snowfall in October - Big Sky, MT
  • Average snowfall in October: 12.44"

The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").

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Average snowfall days in October
Big Sky, MT

Average snowfall days in October - Big Sky, MT
  • Average snowfall days in October: 13.8 days

The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).

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Average daylight in October /
Average sunshine in October
Big Sky, MT

Average daylight in October / Average sunshine in October - Big Sky, MT
  • Average daylight in October: 10h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in October: 6h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

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Average sunshine days in October
Big Sky, MT

Average sunshine days in October - Big Sky, MT
  • Average sunshine days in October: 13.6 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).

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Average UV index in October
Big Sky, MT

Average UV index in October - Big Sky, MT
  • Average UV index in October: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).

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Average cloud cover in October
Big Sky, MT

Average cloud cover in October - Big Sky, MT
  • Average cloud cover in October: 34

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 17).

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Average visibility in October
Big Sky, MT

Average visibility in October - Big Sky, MT
  • Average visibility in October: 6mi

The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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Big Sky, Montana, USA

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