Weather in Phoenix in September
September in Phoenix is warm with average temperatures around 30.2°C (86.4°F). Light rainfall with only 22mm expected.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
37.5°C
99.5°F
Low
23.0°C
73.4°F
Precipitation
22 mm
0.9 inches
~4 rainy days
Conditions
Humidity
31%
Comparison to Adjacent Months
September is 2.8°C cooler than August.
September is 6.3°C warmer than October.