Phoenix Weather in August
August continues the extreme heat of summer at Phoenix, Arizona. The weather is also slightly more humid now than the rest of summer.
This page gives detailed information on the typical August temperature, precipitation, sun, humidity, wind and storms for Phoenix.
The temperature and rainfall numbers here are historical averages based on climate data gathered in downtown Phoenix. The rest of the weather measurements are averages at the Phoenix Sky Harbor International Airport, located a few miles southeast of the city center.
|104 °F||August average high||40 °C|
|82 °F||August average low||28 °C|
In most years, Phoenix averages a daily maximum temperature for August that's between 103 and 106 degrees Fahrenheit (39 to 41 degrees Celsius). The minimum temperature usually falls between 80 and 84 °F (27 to 29 °C).
The days at Phoenix maintain steady temperatures during August, with no substantial cooling by the end of the month.
|27 days||100 °F max. or more (38 °C)|
|0 days||70 °F min. or less (21 °C)|
During August, the temperature in Phoenix dips to 70 °F (21 °C) just once a decade on average.
|1.0 in||total precipitation||25 mm|
|3 days||of rain|
Half the time, Phoenix receives 0.3 to 1.2 inches (7 to 30 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter.
|18 days||clear skies|
The sun's rays reach the ground in Phoenix during 85 percent of daylight hours on average in August, for a total of 352 hours in the month. Typically on 18 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in August at Phoenix lasts for 13 hours and 20 minutes a day on average. The longest day of the month is the 1st with 13 hours and 47 minutes of daylight. By the end of the month, the days have shortened to 12:53 from sunrise to sunset. These durations can vary by a minute or two from year to year.
|36 %||August average humidity|
The relative humidity in Phoenix during August usually peaks at 51 percent in the morning then drops to 23 percent by late afternoon.
|Local Time||2 am||5 am||8 am||11 am||2 pm||5 pm||8 pm||11 pm|
|6.6 mph||August wind speed average||10.6 kph|
August is a little windier than most other months in Phoenix.
|1 day||rainfall of 0.5 inches (13 mm) or more|
|7 days||with thunderstorms in August|
Every few years, Phoenix receives an inch (25 mm) or more of rain in one day during August.
Thunderstorms at Phoenix are most common during August.
These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.