Sun Valley weather in August 2025

Expect 25°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Sun Valley in August based on long-term weather averages. There is usually 8 days with some rainfall and 27 mm of average monthly rainfall in August.

  • 25°C maximum daytime temperature in August in Sun Valley25
    25°C max day temperature
  • 10 hours of sunshine per day
  • 8 days with some rainfall in August in Sun Valley8
    8 days with some rainfall
  • 5°C minimum night-time temperature in August in Sun Valley5
    5°C 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
  • 27 mm monthly rainfall in August in Sun Valley27
    27 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in August in Sun Valley9
    9 (Very High) UV index

More about Sun Valley

Sun Valley by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Idaho

KAYAK: US travel deals of the day

  • Check out the deals of the day on US travel
  • Save on flights, hotels & car hire for US destinations
  • Filter deals by destination, deal type, month & budget
Go to KAYAK deal >>

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 / mm)  |  Imperial (°F / inches)

Back to top

More about the USA

How hot is it in Sun Valley in August?

Daytime temperatures usually reach 25°C in Sun Valley in August with no heat and humidity, falling to 5°C 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 27mm.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^