Flagstaff weather in September 2026

Expect daytime maximum temperatures of 23°C in Flagstaff, Arizona in September based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 49 mm of rainfall in the month.

  • 23°C maximum daytime temperature in September in Flagstaff23
    23°C max day temperature
  • 10 hours of sunshine per day
  • 7 days with some rainfall in September in Flagstaff7
    7 days with some rainfall
  • 3°C minimum night-time temperature in September in Flagstaff3
    3°C min night temperature
  • 12 hours of daylight per day in September in Flagstaff12
    12 hours of daylight per day
  • No heat & humidity in September in Flagstaff0
    No heat & humidity
  • 49 mm monthly rainfall in September in Flagstaff49
    49 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Flagstaff9
    9 (Very High) UV index

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The September weather guide for Arizona (Flagstaff) 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 Flagstaff in September?

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

How sunny is it in Flagstaff in September?

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

Does it ever rain in Flagstaff in September?

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

Flagstaff September sunrise & sunset times

Browse the sunrise and sunset times for Flagstaff in September 2026. Select a month to view Flagstaff sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:59 18:53
Tuesday, 15th September 2026 06:09 18:33
Wednesday, 30th September 2026 06:21 18:12

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