August Weather in Zion National Park Utah, United States

Daily high temperatures decrease by 5°F, from 97°F to 92°F, rarely falling below 85°F or exceeding 103°F.

Daily low temperatures decrease by 5°F, from 69°F to 64°F, rarely falling below 58°F or exceeding 74°F.

For reference, on July 11, the hottest day of the year, temperatures in Zion National Park typically range from 69°F to 98°F, while on January 5, the coldest day of the year, they range from 28°F to 49°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

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The month of August in Zion National Park experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 24% to 19%.

The clearest day of the month is August 31, with clear, mostly clear, or partly cloudy conditions 81% of the time.

For reference, on February 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on September 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 85%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Zion National Park, the chance of a wet day over the course of August is gradually decreasing, starting the month at 17% and ending it at 15%.

For reference, the year's highest daily chance of a wet day is 18% on August 10, and its lowest chance is 4% on June 18.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during August in Zion National Park is essentially constant, remaining about 0.9 inches throughout, and rarely exceeding 1.9 inches or falling below 0.1 inches.

The highest average 31-day accumulation is 0.9 inches on August 15.

Over the course of August in Zion National Park, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 3 minutes, implying an average daily decrease of 2 minutes, 6 seconds, and weekly decrease of 14 minutes, 39 seconds.

The shortest day of the month is August 31, with 12 hours, 59 minutes of daylight and the longest day is August 1, with 14 hours, 2 minutes of daylight.

The earliest sunrise of the month in Zion National Park is 6:37 AM on August 1 and the latest sunrise is 25 minutes later at 7:02 AM on August 31.

The latest sunset is 8:39 PM on August 1 and the earliest sunset is 38 minutes earlier at 8:01 PM on August 31.

Daylight saving time is observed in Zion National Park during 2024, but it neither starts nor ends during August, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:11 AM and sets 14 hours, 44 minutes later, at 8:55 PM, while on December 21, the shortest day of the year, it rises at 7:42 AM and sets 9 hours, 36 minutes later, at 5:18 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for August 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Zion National Park is essentially constant during August, remaining around 0% throughout.

For reference, on July 23, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Zion National Park is essentially constant during August, remaining within 0.2 miles per hour of 6.6 miles per hour throughout.

For reference, on April 10, the windiest day of the year, the daily average wind speed is 9.1 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 6.4 miles per hour.

The lowest daily average wind speed during August is 6.4 miles per hour on August 5.

The hourly average wind direction in Zion National Park throughout August is predominantly from the south, with a peak proportion of 44% on August 18.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Zion National Park typically lasts for 7.4 months (226 days), from around March 27 to around November 8, rarely starting before March 1 or after April 17, and rarely ending before October 20 or after November 26.

The month of August in Zion National Park is reliably fully within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Zion National Park are rapidly increasing during August, increasing by 850°F, from 2,711°F to 3,560°F, over the course of the month.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Zion National Park is gradually decreasing during August, falling by 0.7 kWh, from 7.3 kWh to 6.6 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Zion National Park are 37.298 deg latitude, -113.026 deg longitude, and 0 ft elevation.

The topography within 2 miles of Zion National Park is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Zion National Park is covered by shrubs (85%) and grassland (11%), within 10 miles by shrubs (68%) and trees (28%), and within 50 miles by shrubs (76%) and trees (19%).