The month of August is hot and not the best time to visit Utah, especially if you want to enjoy the outdoor activities at the National and State Parks around the state.
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August is typically very hot in Zion National Park. The average temperature for Zion Canyon in August is a high of 97 and a low of 66 degrees Fahrenheit (36/19 degrees Celsius). In Kolob Canyons, the average temperature is a high of 87 and a low of 57 degrees Fahrenheit (30/13 degrees Celsius).
In summer the days tend to be pleasant, with daytime highs in June typically in the high 60s to low 70s (F), high 70s to low 80s in July and August, while September is similar to June.
The average high at the South Rim in August is 82 degrees Fahrenheit, and the average low is 49 degrees Fahrenheit (high of 28 degrees Celsius, low 9 degrees Celsius.) However, these temperatures are much warmer inside the Canyon, sometimes by 10-20 degrees, and feel even warmer in the sun.
As with many National Parks across the country, tourist crowds peak during the months of June, July, and August. This is when you are going to find many families at Bryce Canyon, and the crowds will almost always be high at the iconic attractions within the park's boundaries.
The summer months in Zion tend to be the busiest and hottest months of the year. In the summer, May through September, temps can reach up to 110 degrees in the heat of the day.
Recommended Wildland trips in AugustAugust is a great time to visit the Grand Canyon, but planning out a trip there yourself can be stressful with the large crowds and danger from the severe weather. But you can bypass all that headache by booking a trip with Wildland Trekking.
Summer is the busiest time to visit Zion. Be prepared to share the park with around a half million other people each month. All available parking in Zion is often full by 9:00 am. If you arrive later than that, you should plan on parking in Springdale and use the town shuttle to reach the Visitor Center.
Mid-day heat in June, July, and August relegate good hiking to mornings and late afternoons. With the longest days of the year in June, the sunrise will come very early, and the sun's light may not fully fade to dark until after 9 PM.
One of the important differences between Bryce Canyon and Zion is that Bryce is at significantly higher elevation than Zion. In fact, Bryce has areas that are as much as 5,000 feet higher in elevation than Zion. This means that Bryce is significantly colder—and snowier—than Zion for a significant portion of the year.