Weather in Phoenix in August 2025
Average weather
Average temperature in Phoenix in August
The temperature in August is +108°F on average, with a range between a maximum of +115°F during the day and a minimum of +77°F at night.
The average maximum temperature goes up 14% by the end of the month, compared with the beginning of the month, from +106°F to +111°F.
Is Phoenix warm or cold in August?
Phoenix is typically hot in August.
Maximum temperatures go down compared to the previous month from +108°F to +106°F. The minimum temperature also goes down from +86°F to +84°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
August is one of the warmest months in Phoenix, here is the comparison with other months:
Climate in Phoenix in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +108°F | +106°F | +102°F | ||||
| Min. temperature | ||||||
| +68°F | +70°F | +59°F | ||||
| Max. temperature | ||||||
| +122°F | +118°F | +115°F | ||||
| Rainfall | ||||||
| 37 mm | 51 mm | 31 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 29% | 34% | 32% | ||||
| Air pressure | ||||||
| 1009 HPa | 1010 HPa | 1009 HPa | ||||
| Sunny days | ||||||
| 9 | 8 | 15 | ||||
| Cloudy days | ||||||
| 11 | 9 | 8 | ||||
| Rainy days | ||||||
| 6 | 8 | 4 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. It’s getting colder in August. From +108°F in the day, the average maximum temperature lowers to +106°F. Prepare for more rain. Average rainfall goes from 37 mm to 51 mm. Humidity rises from 29% to 34%. The average wind speed doesn’t change much during August, staying around 2 m/s. The days becoming less sunny, going from 9 sunny days in July to 8 in August.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Phoenix is gradually increasing during August, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last August in Phoenix?
Climate Change Over the Years
The climate in Phoenix in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+86°F) and the highest in 1989 (+91°F). The driest year was 2009 with only 125 mm of rainfall, and the wettest year was 1984 with 660 mm.
FAQ
Is August a good time to visit Phoenix?
Can you sunbathe in Phoenix in August?
Is Phoenix rainy in August?
Is it sunny in Phoenix in August?
Other cities in USA
Monthly weather in Phoenix
Source of the data
For this page, we’ve looked at the typical weather in Phoenix, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.