Salt Lake City Weather in August

August's weather is slightly cooler than the previous month at Salt Lake City, Utah. This month also has more wind and thunderstorms than any other. Yet it is another dry month with little rain, low humidity and lots of sun.

This page gives detailed information on the typical August temperature, precipitation, sun, humidity, wind and storms for Salt Lake City. The numbers here are historical averages based on climate data gathered at the Salt Lake City International Airport, located a few miles northwest of the city's center.

Temperature Weather iconTemperature

92 °F August average high 33 °C
67 °F August average low 19 °C
21 days 90 °F max. or more (32 °C)
7 days 60 °F min. or less (16 °C)

Nearly every day in August warms to over 80 degrees Fahrenheit (27 degrees Celsius) in Salt Lake City. The city averages 2 days this month when the thermometer reaches into the 100s °F (over 38 °C).

Most nights this month cool to 70 °F (21 °C) or less. But most years, nighttime temperatures stay above 50 °F (10 °C) in August.

Rainy Weather iconRain

0.6 in total precipitation 15 mm
5 days of rain

Half the time, Salt Lake City receives 0.2 to 0.7 inches (5 to 18 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

82 % sunshine
16 days clear skies

The sun's rays reach the ground in Salt Lake City during 82 percent of daylight hours on average in August, for a total of 349 hours in the month. Typically on 16 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in August at Salt Lake City lasts for 13 hours and 43 minutes a day on average. The longest day of the month is the 1st with 14 hours and 18 minutes of daylight. By the end of the month, the days have shortened to 13:07 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

39 % August average humidity

The relative humidity in Salt Lake City during August usually peaks at 54 percent in the morning then drops to 23 percent by late afternoon.

Local Time2 am5 am8 am11 am2 pm5 pm8 pm11 pm
Humidity % 50 54 44 30 24 23 38 45

Windy Weather iconWind

9.7 mph August wind speed average 15.6 kph

August is the windiest month in Salt Lake City.

Stormy Weather iconStorms

0 days rainfall of 0.5 inches (13 mm) or more
8 days with thunderstorms in August

Salt Lake City has more thunderstorms in August than any other month. August storms that produce half and inch or more of rain in one day occur just once in five years.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

Salt Lake City Weather
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