Sweetwater, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sweetwater, a community in Nez Perce County, Idaho.
Tonight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. South wind around 2 mph.
7-day forecast for Sweetwater
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Cloudy | 2 mph S | 2% |
| Saturday | 80°F | Sunny | 0 to 3 mph NW | 2% |
| Saturday Night | 52°F | Mostly Clear | 3 mph SE | 0% |
| Sunday | 84°F | Sunny | 3 mph NE | 0% |
| Sunday Night | 53°F | Clear | 3 mph SE | 0% |
| Monday | 86°F | Sunny | 3 mph NE | 0% |
| Monday Night | 55°F | Mostly Clear | 3 mph SE | 0% |
| Tuesday | 83°F | Sunny | 3 mph NE | 1% |
| Tuesday Night | 53°F | Mostly Clear | 3 mph SW | 1% |
| Wednesday | 79°F | Sunny | 3 mph NE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 3 mph S | 1% |
| Thursday | 84°F | Sunny | 3 mph NE | 1% |
| Thursday Night | 53°F | Partly Cloudy | 3 mph S | 4% |
| Friday | 79°F | Mostly Sunny | 2 to 6 mph SW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Sweetwater (46.368, -116.797). Updated through the day.
Growing snapshot for Sweetwater
Last spring frost
May 23
First fall frost
Sep 25
Growing season
121 days
Hardiness zone
7b
More local growing data for Sweetwater: nearby ZIP 83540 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Winchester, Id (10.6 mi from Sweetwater). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.