- Save up to 20% when you book long stays with Marriott
- 20% off - 4-6 nights, 15% off 3 nights
- Book hotels in Europe, the Middle East & Africa
Sun Valley weather in August 2026
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 max day temperature
77 - 10 hours of sunshine per day
- 8 days with some rainfall
8 - 41°F min night temperature
41 - 14 hours of daylight per day
14 - No heat & humidity
0 - 1.1 inches of monthly rainfall
1.1 - 9 (Very High) UV index
9
More about Sun Valley
- Best time to visit
- Weather by month
- 5-day weather forecast
- Destinations
- Travel guide
- Deals & discounts
Sun Valley by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Recommended for Idaho
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)
More about the USA
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 2026. Select a month to view Sun Valley sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Saturday, 1st August 2026 | 05:27 | 20:00 |
| Sunday, 16th August 2026 | 05:43 | 19:39 |
| Monday, 31st August 2026 | 06:00 | 19:14 |
Be inspired
Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers
We promise not to share your details
Related posts
Popular travel offers
Explore holiday destinations
- Beach holidays
- City breaks
- Family holidays
- Half term holidays
- Spring holidays
- Summer holidays
- Autumn holidays
- Winter sun holidays
- Honeymoons
- Coolcations
- Compare places
- Ski resorts
Save with latest deals & discounts
- Holiday offers
- Top travel brands
- Airlines & flights
- Discount hotels
- TUI
- Jet2holidays
- Neilson
- Marella Cruises
- Roamless eSIMs
- Confused.com
- Pierre & Vacances
- Caledonian Travel
Airport parking
- Manchester Airport
- Stansted Airport
- Bristol Airport
- Luton Airport
- Birmingham Airport
- Edinburgh Airport
- Gatwick Airport
- Glasgow Airport
- Newcastle Airport
Airport lounges
- Manchester Airport
- Birmingham Airport
- Bristol Airport
- Edinburgh Airport
- Glasgow Airport
- Heathrow Airport
- Newcastle Airport
- Stansted Airport
- Gatwick Airport