Sun Valley, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Valley, a city in Blaine County, Idaho.
This Afternoon
44°F
Mostly Cloudy
Mostly cloudy. High near 44, with temperatures falling to around 40 in the afternoon. Southeast wind 2 to 6 mph.
7-day forecast for Sun Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 44°F | Mostly Cloudy | 2 to 6 mph SE | 0% |
| Tonight | 26°F | Areas Of Fog then Mostly Cloudy | 5 mph NE | 1% |
| Wednesday | 49°F | Mostly Sunny | 1 to 7 mph SW | 1% |
| Wednesday Night | 24°F | Areas Of Fog | 3 mph ENE | 0% |
| Thursday | 44°F | Areas Of Fog | 2 to 7 mph W | 6% |
| Thursday Night | 21°F | Areas Of Fog | 3 to 7 mph NW | 2% |
| Friday | 47°F | Mostly Sunny | 2 to 6 mph SSW | 1% |
| Friday Night | 26°F | Partly Cloudy | 2 to 6 mph NW | 1% |
| Saturday | 51°F | Mostly Sunny | 5 mph S | 0% |
| Saturday Night | 29°F | Partly Cloudy | 5 mph NE | 0% |
| Sunday | 53°F | Mostly Sunny | 3 to 8 mph W | 0% |
| Sunday Night | 29°F | Partly Cloudy | 3 mph NNW | 0% |
| Monday | 53°F | Mostly Sunny | 2 to 6 mph S | 1% |
| Monday Night | 29°F | Partly Cloudy | 3 mph WSW | 5% |
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 Nov 3, 2026.