August weather forecastWest Yellowstone, MT
August
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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 30min
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: 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: 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: 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: 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).
