Flagstaff weather in August 2025

Expect 79°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Flagstaff in August. Check more long-term weather averages for Flagstaff in August before you book your next holiday to Arizona in 2025/2026.

  • 79°F maximum daytime temperature in August in Flagstaff79
    79°F max day temperature
  • 10 hours of sunshine per day
  • 9 days with some rainfall in August in Flagstaff9
    9 days with some rainfall
  • 45°F minimum night-time temperature in August in Flagstaff45
    45°F 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
  • 2.9 inches monthly rainfall in August in Flagstaff2.9
    2.9 inches 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)  |  Imperial (°F)

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More about Arizona

How hot is it in Flagstaff in August?

Daytime temperatures usually reach 79°F in Flagstaff in August with low heat and humidity, falling to 45°F 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 2.9 inches.

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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