Click on a day for an hourly weather forecast
The temperatures in Phoenix during September are extremely high, between 28°C and hot as 37°C, drinking water regularly is advisable.
You can expect about 3 to 8 days of rain in Phoenix during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Phoenix in September 2025.
If you’re planning to visit Phoenix in the near future, we highly recommend that you review the 14 day weather forecast for Phoenix before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 19° / 9° | 1 | 30 | 0 | 34 mm | Good | Phoenix in January |
| February | 21° / 11° | 2 | 26 | 0 | 31 mm | Good | Phoenix in February |
| March | 25° / 14° | 1 | 30 | 0 | 24 mm | Perfect | Phoenix in March |
| April | 29° / 18° | 1 | 29 | 0 | 9 mm | Good | Phoenix in April |
| May | 33° / 21° | 0 | 31 | 0 | 4 mm | Good | Phoenix in May |
| June | 39° / 27° | 0 | 30 | 0 | 6 mm | Bad | Phoenix in June |
| July | 39° / 30° | 4 | 27 | 0 | 64 mm | Bad | Phoenix in July |
| August | 39° / 30° | 3 | 28 | 0 | 54 mm | Bad | Phoenix in August |
| September | 37° / 28° | 3 | 27 | 0 | 54 mm | Ok | Phoenix in September |
| October | 31° / 21° | 2 | 29 | 0 | 27 mm | Good | Phoenix in October |
| November | 25° / 15° | 1 | 29 | 0 | 23 mm | Perfect | Phoenix in November |
| December | 18° / 10° | 2 | 29 | 0 | 37 mm | Good | Phoenix in December |