Grand Canyon weather in August 2025

Expect 90°F daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Grand Canyon in August. Check more long-term weather averages for Grand Canyon in August before you book your next holiday to Arizona in 2025/2026.

  • 90°F maximum daytime temperature in August in Grand Canyon90
    90°F max day temperature
  • 11 hours of sunshine per day
  • 7 days with some rainfall in August in Grand Canyon7
    7 days with some rainfall
  • 57°F minimum night-time temperature in August in Grand Canyon57
    57°F min night temperature
  • 13 hours of daylight per day in August in Grand Canyon13
    13 hours of daylight per day
  • Low heat & humidity in August in Grand CanyonL
    Low heat & humidity
  • 1.5 inches monthly rainfall in August in Grand Canyon1.5
    1.5 inches of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in Grand Canyon10
    10 (Very High) UV index

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The August weather guide for Arizona (Grand Canyon) 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 Grand Canyon in August?

Daytime temperatures usually reach 90°F in Grand Canyon in August with low heat and humidity, falling to 57°F at night.

How sunny is it in Grand Canyon in August?

There are normally 11 hours of bright sunshine each day in Grand Canyon in August - that's 79% of daylight hours.

Does it rain in Grand Canyon in August?

There are usually 7 days with some rain in Grand Canyon in August and the average monthly rainfall is 1.5 inches.

Grand Canyon August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:36 19:33
Saturday, 16th August 2025 05:48 19:17
Sunday, 31st August 2025 06:00 18:57

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