Sun Valley, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Valley, a city in Blaine County, Idaho.
Overnight
36°F
Mostly Cloudy
Mostly cloudy. Low around 36, with temperatures rising to around 38 overnight. North wind around 2 mph. Chance of precipitation is 30%.
7-day forecast for Sun Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 36°F | Mostly Cloudy | 2 mph N | 27% |
| Saturday | 60°F | Slight Chance Light Rain then Chance Showers And Thunderstorms | 1 to 5 mph WNW | 51% |
| Saturday Night | 33°F | Partly Cloudy | 1 to 5 mph NE | 11% |
| Sunday | 66°F | Mostly Sunny | 2 to 6 mph NW | 4% |
| Sunday Night | 36°F | Partly Cloudy | 3 mph E | 2% |
| Monday | 70°F | Sunny | 3 to 7 mph E | 1% |
| Monday Night | 39°F | Partly Cloudy | 5 mph N | 0% |
| Tuesday | 71°F | Mostly Sunny | 2 to 7 mph W | 1% |
| Tuesday Night | 39°F | Partly Cloudy | 5 mph NNW | 1% |
| Wednesday | 72°F | Sunny | 3 to 9 mph S | 3% |
| Wednesday Night | 39°F | Mostly Clear | 6 mph NNE | 2% |
| Thursday | 73°F | Sunny | 3 to 9 mph ESE | 2% |
| Thursday Night | 41°F | Partly Cloudy | 3 to 7 mph ENE | 1% |
| Friday | 72°F | Mostly Sunny | 5 to 10 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Sun Valley (43.684, -114.334). Updated through the day.
Growing snapshot for Sun Valley
Growing season
77 days
Hardiness zone
5b
More local growing data for Sun Valley: nearby ZIP 83353 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ketchum Rs, Id (1.8 mi from Sun Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.