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Sun Valley weather in September 2026
Expect daytime maximum temperatures of 68°F in Sun Valley, Idaho in September based on long-term weather averages. There are 9 hours of sunshine per day on average.
- 68°F max day temperature
68 - 9 hours of sunshine per day
- 8 days with some rainfall
8 - 34°F min night temperature
34 - 12 hours of daylight per day
12 - No heat & humidity
0 - 1.0 inches of monthly rainfall
1.0 - 6 (High) UV index
6
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Recommended for Idaho
The September 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 September?
Daytime temperatures usually reach 77°F in Sun Valley in September with no heat and humidity, falling to 46°F at night.
How sunny is it in Sun Valley in September?
There are normally 10 hours of bright sunshine each day in Sun Valley in September - that's 80% of daylight hours.
Does it rain in Sun Valley in September?
There are usually 4 days with some rain in Sun Valley in September and the average monthly rainfall is 0.7 inches.
Sun Valley September sunrise & sunset times
Browse the sunrise and sunset times for Sun Valley in September 2026. Select a month to view Sun Valley sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Tuesday, 1st September 2026 | 06:01 | 19:13 |
| Tuesday, 15th September 2026 | 06:17 | 18:47 |
| Wednesday, 30th September 2026 | 06:34 | 18:20 |
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