Flagstaff weather in August 2025

Expect daytime maximum temperatures of 26°C in Flagstaff, Arizona in August based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 73 mm of rainfall in the month.

  • 26°C maximum daytime temperature in August in Flagstaff26
    26°C max day temperature
  • 10 hours of sunshine per day
  • 9 days with some rainfall in August in Flagstaff9
    9 days with some rainfall
  • 7°C minimum night-time temperature in August in Flagstaff7
    7°C min night temperature
  • 13 hours of daylight per day in August in Flagstaff13
    13 hours of daylight per day
  • Low heat & humidity in August in FlagstaffL
    Low heat & humidity
  • 73 mm monthly rainfall in August in Flagstaff73
    73 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in August in Flagstaff11
    11 (Extreme) UV index

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The August 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 August?

Daytime temperatures usually reach 26°C in Flagstaff in August with low heat and humidity, falling to 7°C at night.

How sunny is it in Flagstaff in August?

There are normally 10 hours of bright sunshine each day in Flagstaff in August - that's 75% of daylight hours.

Does it rain in Flagstaff in August?

There are usually 9 days with some rain in Flagstaff in August and the average monthly rainfall is 73mm.

Flagstaff August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:36 19:29
Saturday, 16th August 2025 05:47 19:14
Sunday, 31st August 2025 05:59 18:54

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