Phoenix weather in September 2025

Expect 37°C daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Phoenix in September. Check more long-term weather averages for Phoenix in September before you book your next holiday to Arizona in 2025/2026.

  • 37°C maximum daytime temperature in September in Phoenix37
    37°C max day temperature
  • 11 hours of sunshine per day
  • 3 days with some rainfall in September in Phoenix3
    3 days with some rainfall
  • 21°C minimum night-time temperature in September in Phoenix21
    21°C min night temperature
  • 12 hours of daylight per day in September in Phoenix12
    12 hours of daylight per day
  • Very high heat & humidity in September in PhoenixVH
    Very High heat & humidity
  • 23 mm monthly rainfall in September in Phoenix23
    23 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Phoenix8
    8 (Very High) UV index

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The September weather guide for Arizona (Phoenix) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Arizona

How hot is it in Phoenix in September?

Daytime temperatures usually reach 37°C in Phoenix in September with very high heat and humidity, falling to 21°C at night.

How sunny is it in Phoenix in September?

There are normally 11 hours of bright sunshine each day in Phoenix in September - that's 88% of daylight hours.

Does it ever rain in Phoenix in September?

There are usually 3 days with some rain in Phoenix in September and the average monthly rainfall is 23mm.

Phoenix September sunrise & sunset times

Browse the sunrise and sunset times for Phoenix in September 2025. Select a month to view Phoenix sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:03 18:53
Monday, 15th September 2025 06:12 18:34
Tuesday, 30th September 2025 06:22 18:14

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