August weather forecast
West Yellowstone, MT

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Weather in August

August strikes a balance between summer's warmth and autumn's cool weather as temperatures moderately dip from 72.9°F (22.7°C) to 71.4°F (21.9°C). The weather in West Yellowstone, Montana remains favorable for outdoor activities. Green landscapes start their transformation into hues of red, brown and orange, signalling the onset of fall. As the month progresses, cool mornings become increasingly common.

Temperature

Shifting into August, West Yellowstone records an average high-temperature of a still agreeable 71.4°F (21.9°C), presenting minor fluctuations compared to the previous month. August presents a sharp fall from West Yellowstone's daytime highs to an average low-temperature of 43.7°F (6.5°C).

Humidity

With an average relative humidity of 50%, August is the least humid month.

Rainfall

In August, in West Yellowstone, the rain falls for 12.3 days. Throughout August, 1.18" (30mm) of precipitation is accumulated. In West Yellowstone, during the entire year, the rain falls for 109.2 days and collects up to 23.15" (588mm) of precipitation.

Snowfall

August is the only month when snow does not fall.

Daylight

The average length of the day in August in West Yellowstone is 13h and 59min.
On the first day of the month, sunrise is at 6:11 am and sunset at 8:49 pm. On the last day of August, sunrise is at 6:46 am and sunset at 8:02 pm MDT.

Sunshine

In West Yellowstone, the average sunshine in August is 11.5h.

UV index

In August, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In August, the average maximum UV index of 3 translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for West Yellowstone in August?

In August, the average high-temperature and low-temperature in West Yellowstone, Montana, are 71.4°F (21.9°C) and 43.7°F (6.5°C) respectively.

What is the least humid month in West Yellowstone?

The least humid month in West Yellowstone, Montana, is August, with an average relative humidity of 50%.

What is the average humidity in August in West Yellowstone?

The average relative humidity in August is 50%.

How much does it rain in West Yellowstone in August?

In August, the rain falls for 12.3 days. Throughout August, 1.18" (30mm) of precipitation is accumulated.

When it does not snow in West Yellowstone?

August is the only month when snow does not fall in West Yellowstone, Montana.

Does it snow in West Yellowstone in August?

In August, in West Yellowstone, Montana, it doesn't snow. July is the latest month when it typically snows.

How many hours of daylight does West Yellowstone have in August?

In August, the average day length in West Yellowstone is 13h and 59min.

When are sunrise and sunset in August in West Yellowstone?

In August, on the first day of the month, sunrise is at 6:11 am and sunset at 8:49 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 8:02 pm MDT.

How many hours of sunshine does West Yellowstone have in August?

In West Yellowstone, the average sunshine duration in August is 11.5h.

What is the UV index reading in August in West Yellowstone?

The average daily maximum UV index in August in West Yellowstone, Montana, is 3. A UV Index of 3 to 5 symbolizes 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
West Yellowstone, MT

Average temperature in August - West Yellowstone, MT
  • Average high temperature in August: 71.4°F

The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).

  • Average low temperature in August: 43.7°F

The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).

Average pressure in August
West Yellowstone, MT

Average pressure in August - West Yellowstone, MT
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in August
West Yellowstone, MT

Average wind speed in August - West Yellowstone, MT
  • Average wind speed in August: 5.8mph

The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

Average humidity in August
West Yellowstone, MT

Average humidity in August - West Yellowstone, MT
  • Average humidity in August: 50%

The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).

Average rainfall in August
West Yellowstone, MT

Average rainfall in August - West Yellowstone, MT
  • Average rainfall in August: 1.18"

The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").

Average rainfall days in August
West Yellowstone, MT

Average rainfall days in August - West Yellowstone, MT
  • Average rainfall days in August: 12.3 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).

Average snowfall in August
West Yellowstone, MT

Average snowfall in August - West Yellowstone, MT
  • Average snowfall in August: 0"

The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").

Average snowfall days in August
West Yellowstone, MT

Average snowfall days in August - West Yellowstone, MT
  • Average snowfall days in August: 0.2 days

The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).

Average daylight in August /
Average sunshine in August
West Yellowstone, MT

Average daylight in August / Average sunshine in August - West Yellowstone, MT
  • Average daylight in August: 14h and 0min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in August: 11h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).

Average sunshine days in August
West Yellowstone, MT

Average sunshine days in August - West Yellowstone, MT
  • Average sunshine days in August: 13.9 days

The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).

Average UV index in August
West Yellowstone, MT

Average UV index in August - West Yellowstone, MT
  • Average UV index in August: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

Average cloud cover in August
West Yellowstone, MT

Average cloud cover in August - West Yellowstone, MT
  • Average cloud cover in August: 17

The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).

Average visibility in August
West Yellowstone, MT

Average visibility in August - West Yellowstone, MT
  • Average visibility in August: 6mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).

West Yellowstone, Montana, USA

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