August 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 August

The weather in Big Sky remains comfortably warm in August, encouraging the continuation of summer activities. Although temperatures begin to dip slightly from July's highs, the outdoor enjoyment doesn't taper off. It retains most of July's warmth while hinting at the upcoming transition to fall. The gentle decrease in daylight hours subtly points towards the seasonal shift that lies just around the corner. Yet, August manages to retain its summer charm, proving to be one of the best months for nature-driven holidays in Big Sky.

Temperature

As August takes its course, Big Sky's average high-temperature registers at an agreeable 72.7°F (22.6°C), closely aligning with the preceding month. August presents a sharp fall from Big Sky's daytime highs to an average low-temperature of 45.1°F (7.3°C).

Humidity

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

Rainfall

In Big Sky, Montana, in August, it is raining for 13.3 days, with typically 1.42" (36mm) of accumulated precipitation. Throughout the year, in Big Sky, there are 116.1 rainfall days, and 23.5" (597mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in August in Big Sky, Montana, 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 8:03 pm MDT.

Sunshine

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

UV index

In August, the average daily maximum UV index in Big Sky is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: A maximum UV index of 4 in August translates into the following recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Around midday, solar radiation is most harmful; hence, exposure should be limited. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the temperature in August in Big Sky?

The average high-temperature, in August, in Big Sky, 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?

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

What is the average humidity in August in Big Sky?

In August, the average relative humidity is 51%.

How much does it rain in Big Sky in August?

In Big Sky, 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, Montana, is August, when snow falls for 0.3 days and typically aggregates up to 0.08" (2mm) of snow.

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

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

What is the average length of the day in August in Big Sky?

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

When are sunrise and 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 8:03 pm MDT.

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

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

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

The average daily maximum UV index in August in Big Sky is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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 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 0min

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 August: 11h and 3min

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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Big Sky, Montana, USA

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