Phoenix weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: November – April
What is the weather like in Phoenix in September?
In September, Phoenix is very hot: daytime highs average 37 °C, and even at night it stays warm at around 24 °C. With around 9 hours of sunshine a day, there is plenty of sun. Rain is rare: about 3 days bring 24 mm in total. On about 29 days the thermometer climbs to 30 °C or more. All in all, September is a so-so month for a holiday in Phoenix.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 50 | 50 | 75 |
| Day | 40° | 37° | 31° |
| Night | 28° | 24° | 16° |
| Sun | 10 h | 9 h | 9 h |
| Rain days | 4 | 3 | 2 |
More details for September
- Daylight
- 12 h 26 min06:11 – 18:36
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 20 %on averageAll months
- Hot days
- 29 days30 °C or moreAll months
- Time zone
- UTC−7America/Phoenix
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
Phoenix in September: quick answers
Is Phoenix hot in September?
Yes. In September, Phoenix is very hot: daytime highs average 37 °C and nights stay around 24 °C. On about 29 days the thermometer climbs to 30 °C or more.
Does it rain much in Phoenix in September?
Rain is rare: about 3 days bring 24 mm in total.
Phoenix month by month
The whole year in PhoenixAll destinations: USAWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences