August weather forecast
Yellowstone National Park, WY

August displays temperatures similar to those of July, sustaining the summer's warmth in Yellowstone National Park. In spite of the heat and scanty 1.6" (41mm) of rain, August days remain relatively crisp. The park's diverse wildlife have adapted to cope with these conditions, offering exemplary viewing opportunities. Wildfires, although infrequent, are a potential weather-related risk. Activities such as camping and hiking remain popular thanks to the long sunny days.

Temperature

August's average high-temperature in Yellowstone National Park is a still agreeable 71.4°F (21.9°C), maintaining a close comparison with July's 71.6°F (22°C). Yellowstone National Park logs a notable disparity from the daily highs during August, as the nighttime temperature lowers to an average of 39.9°F (4.4°C).

Rainfall

In Yellowstone National Park, in August, it is raining for 10.8 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, there are 151 rainfall days, and 20.91" (531mm) of precipitation is accumulated.

Snowfall

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

Daylight

In August, the average length of the day is 13h and 59min.
On the first day of the month, sunrise is at 6:10 am and sunset at 8:46 pm. On the last day of August, sunrise is at 6:44 am and sunset at 7:59 pm MDT.

Sunshine

The average sunshine in August in Yellowstone National Park is 10h.

UV index

In August, the average daily maximum UV index is 8. A UV Index reading of 8 to 10 represents a very high threat to health from unsafe exposure to UV radiation for the average person.
Note: A typical high UV index of 8 in August suggests the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.