Grand Junction weather in August 2025

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

  • 90°F maximum daytime temperature in August in Grand Junction90
    90°F max day temperature
  • 11 hours of sunshine per day
  • 6 days with some rainfall in August in Grand Junction6
    6 days with some rainfall
  • 59°F minimum night-time temperature in August in Grand Junction59
    59°F min night temperature
  • 14 hours of daylight per day in August in Grand Junction14
    14 hours of daylight per day
  • Moderate heat & humidity in August in Grand JunctionM
    Moderate heat & humidity
  • 0.9 inches monthly rainfall in August in Grand Junction0.9
    0.9 inches of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in Grand Junction10
    10 (Very High) UV index

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The August weather guide for Colorado (Grand Junction) 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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How hot is it in Grand Junction in August?

Daytime temperatures usually reach 90°F in Grand Junction in August with moderate heat and humidity, falling to 59°F at night.

How sunny is it in Grand Junction in August?

There are normally 11 hours of bright sunshine each day in Grand Junction in August - that's 78% of daylight hours.

Does it rain in Grand Junction in August?

There are usually 6 days with some rain in Grand Junction in August and the average monthly rainfall is 0.9 inches.

Grand Junction August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:15 19:25
Saturday, 16th August 2025 05:29 19:07
Sunday, 31st August 2025 05:42 18:46

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