Phoenix weather in August 2025

Expect 39°C daytime maximum temperatures in the shade with on average 12 hours of sunshine per day in Phoenix in August. Check more long-term weather averages for Phoenix in August before you book your next holiday to Arizona in 2025/2026.

  • 39°C maximum daytime temperature in August in Phoenix39
    39°C max day temperature
  • 12 hours of sunshine per day
  • 5 days with some rainfall in August in Phoenix5
    5 days with some rainfall
  • 24°C minimum night-time temperature in August in Phoenix24
    24°C min night temperature
  • 13 hours of daylight per day in August in Phoenix13
    13 hours of daylight per day
  • Very high heat & humidity in August in PhoenixVH
    Very High heat & humidity
  • 32 mm monthly rainfall in August in Phoenix32
    32 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in Phoenix10
    10 (Very High) UV index

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The August 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 August?

Daytime temperatures usually reach 39°C in Phoenix in August with very high heat and humidity, falling to 24°C at night.

How sunny is it in Phoenix in August?

There are normally 12 hours of bright sunshine each day in Phoenix in August - that's 86% of daylight hours.

Does it ever rain in Phoenix in August?

There are usually 5 days with some rain in Phoenix in August and the average monthly rainfall is 32mm.

Phoenix August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:41 19:28
Saturday, 16th August 2025 05:52 19:13
Sunday, 31st August 2025 06:02 18:55

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