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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
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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)
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How hot is it in Sun Valley in August?
Daytime temperatures usually reach 88°F in Sun Valley in August with moderate heat and humidity, falling to 55°F at night.
How sunny is it in Sun Valley in August?
There are normally 12 hours of bright sunshine each day in Sun Valley in August - that's 83% of daylight hours.
Does it ever rain in Sun Valley in August?
There are usually 3 days with some rain in Sun Valley in August and the average monthly rainfall is 0.4 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 |
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