August weather forecast
Big Sky, MT

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 August

August, the last month of the summer in Big Sky, is also an agreeable month, with an average temperature fluctuating between 72.7°F (22.6°C) and 45.1°F (7.3°C).

Temperature

In Big Sky, the average high-temperature in August is almost the same as in July - an agreeable 72.7°F (22.6°C). The average low-temperature, in Big Sky, Montana, is 45.1°F (7.3°C).

Humidity

August is the least humid month, with an average relative humidity of 51%.

Rainfall

In Big Sky, during 13.3 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Big Sky, during the entire year, the rain falls for 116.1 days and collects up to 23.5" (597mm) of precipitation.

Snowfall

Months with snowfall in Big Sky are January through December. The month with the least snowfall in Big Sky is August, when snow falls for 0.3 days and typically aggregates up to 0.08" (2mm) of snow.

Daylight

In Big Sky, the average length of the day in August is 14h and 2min.
On the first day of the month, sunrise is at 6:10 am and sunset at 8:52 pm. On the last day of August, sunrise is at 6:46 am and sunset at 8:04 pm MDT.

Sunshine

In Big Sky, the average sunshine in August is 11.5h.

UV index

The average daily maximum UV index in August is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In August, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in August in Big Sky?

The average high-temperature, in August, in Big Sky, Montana, is 72.7°F (22.6°C), while the average low-temperature is 45.1°F (7.3°C).

What is the least humid month in Big Sky?

With an average relative humidity of 51%, August is the least humid month.

What is the average humidity in August in Big Sky?

In Big Sky, the average relative humidity in August is 51%.

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

In Big Sky, Montana, during August, the rain falls for 13.3 days and regularly aggregates up to 1.42" (36mm) of precipitation.

When it does not snow in Big Sky?

The month with the least snowfall in Big Sky is August, when snow falls for 0.3 days and typically aggregates up to 0.08" (2mm) of snow.

How much does it snow in Big Sky in August?

In Big Sky, in August, during 0.3 snowfall days, 0.08" (2mm) of snow is typically accumulated.

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

The average day length in August in Big Sky, Montana, is 14h and 2min.

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

In August, on the first day of the month, sunrise is at 6:10 am and sunset at 8:52 pm. On the last day of the month, in Big Sky, Montana, sunrise is at 6:46 am and sunset at 8:04 pm MDT.

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

The average sunshine duration in August is 11.5h.

What is the UV index reading in August in Big Sky?

In Big Sky, the average daily maximum UV index in August is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Big Sky, MT

Average temperature in August - Big Sky, MT
  • Average high temperature in August: 72.7°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 August: 45.1°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 August
Big Sky, MT

Average pressure in August - Big Sky, MT
  • Average pressure in August: 29.97"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 August
Big Sky, MT

Average wind speed in August - Big Sky, MT
  • Average wind speed in August: 4.8mph

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 August
Big Sky, MT

Average humidity in August - Big Sky, MT
  • Average humidity in August: 51%

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 August
Big Sky, MT

Average rainfall in August - Big Sky, MT
  • Average rainfall in August: 1.42"

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 August
Big Sky, MT

Average rainfall days in August - Big Sky, MT
  • Average rainfall days in August: 13.3 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 August
Big Sky, MT

Average snowfall in August - Big Sky, MT
  • Average snowfall in August: 0.08"

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 August
Big Sky, MT

Average snowfall days in August - Big Sky, MT
  • Average snowfall days in August: 0.3 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 August /
Average sunshine in August
Big Sky, MT

Average daylight in August / Average sunshine in August - Big Sky, MT
  • Average daylight in August: 14h and 2min

The month with the longest days is June (Average daylight: 15h and 35min).
The month with the shortest days is December (Average daylight: 8h and 49min).

  • Average sunshine in August: 11h and 30min

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 August
Big Sky, MT

Average sunshine days in August - Big Sky, MT
  • Average sunshine days in August: 12.5 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 August
Big Sky, MT

Average UV index in August - Big Sky, MT
  • Average UV index in August: 4

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 August
Big Sky, MT

Average cloud cover in August - Big Sky, MT
  • Average cloud cover in August: 18

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 August
Big Sky, MT

Average visibility in August - Big Sky, MT
  • Average visibility in August: 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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