Sun Valley weather in August 2025

Expect daytime maximum temperatures of 77°F in Sun Valley, Idaho in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

  • 77°F maximum daytime temperature in August in Sun Valley77
    77°F max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in Sun Valley8
    8 days with some rainfall
  • 41°F minimum night-time temperature in August in Sun Valley41
    41°F min night temperature
  • 14 hours of daylight per day in August in Sun Valley14
    14 hours of daylight per day
  • No heat & humidity in August in Sun Valley0
    No heat & humidity
  • 1.1 inches monthly rainfall in August in Sun Valley1.1
    1.1 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in August in Sun Valley9
    9 (Very High) UV index

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The August weather guide for Idaho (Sun Valley) 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 Sun Valley in August?

Daytime temperatures usually reach 77°F in Sun Valley in August with no heat and humidity, falling to 41°F at night.

How sunny is it in Sun Valley in August?

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

Does it rain in Sun Valley in August?

There are usually 8 days with some rain in Sun Valley in August and the average monthly rainfall is 1.1 inches.

Sun Valley August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:27 20:00
Saturday, 16th August 2025 05:44 19:39
Sunday, 31st August 2025 06:00 19:14

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