Weather in Phoenix in September 2025
Average weather
Average temperature in Phoenix in September
The temperature in September is +102°F on average, with a range between a maximum of +113°F during the day and a minimum of +72°F at night.
The average maximum temperature goes down 17% by the end of the month, compared with the beginning of the month, from +106°F to +99°F.
Is Phoenix warm or cold in September?
Phoenix is typically hot in September.
Maximum temperatures go down compared to the previous month from +106°F to +102°F. The minimum temperature also goes down from +84°F to +77°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
Take a look at how September is compared to other months in Phoenix:
Climate in Phoenix in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +106°F | +102°F | +91°F | ||||
| Min. temperature | ||||||
| +70°F | +59°F | +43°F | ||||
| Max. temperature | ||||||
| +118°F | +115°F | +109°F | ||||
| Rainfall | ||||||
| 51 mm | 31 mm | 21 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 1 m/s | ||||
| Humidity | ||||||
| 34% | 32% | 32% | ||||
| Air pressure | ||||||
| 1010 HPa | 1009 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 8 | 15 | 18 | ||||
| Cloudy days | ||||||
| 9 | 8 | 9 | ||||
| Rainy days | ||||||
| 8 | 4 | 3 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +106°F in the day, the average maximum temperature lowers to +102°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 51 mm to 31 mm. It feels drier, as humidity decreases from 34% to 32%. The average wind speed doesn’t change much during September, staying around 2 m/s. The good news is there are likely to be more sunny days in September, from 8 to 15.
But maybe it is worth considering traveling in October as the weather gets better.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Phoenix is gradually increasing during September, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Phoenix?
Climate Change Over the Years
The climate in Phoenix in September 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 September a good time to visit Phoenix?
Can you sunbathe in Phoenix in September?
Is Phoenix rainy in September?
Is it sunny in Phoenix in September?
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.