August weather forecast
Yellowstone National Park, WY

The natural Grand Prismatic hot springs within Yellowstone National Park, Wyoming, with yellow trails and trees and mountains in the background
The natural Grand Prismatic hot springs within Yellowstone National Park, Wyoming, with yellow trails and trees and mountains in the background

Weather in August

August, the last month of the summer in Yellowstone National Park, is another pleasant month, with temperature in the range of an average high of 71.4°F (21.9°C) and an average low of 39.9°F (4.4°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still agreeable 71.4°F (21.9°C). The average low-temperature, in August, is 39.9°F (4.4°C).

Rainfall

In August, in Yellowstone National Park, the rain falls for 10.8 days. Throughout August, 1.6" (40.6mm) of precipitation is accumulated. Throughout the year, in Yellowstone National Park, there are 151 rainfall days, and 20.9" (530.8mm) of precipitation is accumulated.

Snowfall

In Yellowstone National Park, snow does not fall in July and August.

Daylight

In Yellowstone National Park, Wyoming, the average length of the day in August is 13h and 59min.
On the first day of the month, sunrise is at 6:09 am and sunset at 8:47 pm. On the last day of August, in Yellowstone National Park, sunrise is at 6:44 am and sunset at 8:00 pm MDT.

Sunshine

In Yellowstone National Park, the average sunshine in August is 10h.

UV index

In Yellowstone National Park, the average daily maximum UV index in August is 8. A UV Index value of 8 to 10 symbolizes a very high threat to health from unsafe exposure to UV radiation for the average person.
Note: In August, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
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FAQ

How much does it rain in Yellowstone National Park in August?

In August, in Yellowstone National Park, the rain falls for 10.8 days. Throughout August, 1.6" (40.6mm) of precipitation is accumulated.

When it does not snow in Yellowstone National Park?

In Yellowstone National Park, Wyoming, snow does not fall in July and August.

Does it snow in Yellowstone National Park in August?

In Yellowstone National Park, Wyoming, in August, it doesn't snow. In September, it regularly snows.

What is the average length of the day in August in Yellowstone National Park?

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

What time are sunrise and sunset in August in Yellowstone National Park?

In August, on the first day of the month, sunrise is at 6:09 am and sunset at 8:47 pm. On the last day of the month, in Yellowstone National Park, Wyoming, sunrise is at 6:44 am and sunset at 8:00 pm MDT.

How many hours of sunshine does Yellowstone National Park have in August?

In Yellowstone National Park, the average sunshine duration in August is 10h.

What is the UV index reading in August in Yellowstone National Park?

In Yellowstone National Park, the average daily maximum UV index in August is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from exposure to Sun's UV rays.
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average UV index

Average temperature in August
Yellowstone National Park, WY

Average temperature in August - Yellowstone National Park, WY
  • Average high temperature in August: 71.4°F

The warmest month (with the highest average high temperature) is July (71.6°F).
The month with the lowest average high temperature is December (24.3°F).

  • Average low temperature in August: 39.9°F

The month with the highest average low temperature is July (41.6°F).
The coldest months (with the lowest average low temperature) are January and February (1.2°F).

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Average rainfall in August
Yellowstone National Park, WY

Average rainfall in August - Yellowstone National Park, WY
  • Average rainfall in August: 1.6"

The wettest month (with the highest rainfall) is May (2.5").
The driest month (with the least rainfall) is October (1.2").

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Average rainfall days in August
Yellowstone National Park, WY

Average rainfall days in August - Yellowstone National Park, WY
  • Average rainfall days in August: 10.8 days

The month with the highest number of rainy days is January (16.8 days).
The month with the least rainy days is October (8.8 days).

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Average snowfall in August
Yellowstone National Park, WY

Average snowfall in August - Yellowstone National Park, WY
  • Average snowfall in August: 0"

The month with the highest snowfall is January (34.3").
The months with the least snowfall are July and August (0").

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Average snowfall days in August
Yellowstone National Park, WY

Average snowfall days in August - Yellowstone National Park, WY
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (16.2 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in August /
Average sunshine in August
Yellowstone National Park, WY

Average daylight in August / Average sunshine in August - Yellowstone National Park, WY
  • Average daylight in August: 13h and 59min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in August: 10h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 4h).

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Average UV index in August
Yellowstone National Park, WY

Average UV index in August - Yellowstone National Park, WY
  • Average UV index in August: 8

The month with the highest UV index is July (UV index 10).
The months with the lowest UV index are January and December (UV index 1).

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