Sweetwater, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sweetwater, a community in Nez Perce County, Idaho.
This Afternoon
80°F
Sunny
Sunny, with a high near 80. North wind around 3 mph.
7-day forecast for Sweetwater
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Sunny | 3 mph N | 1% |
| Tonight | 51°F | Mostly Clear | 3 mph SE | 1% |
| Sunday | 86°F | Sunny | 3 mph NE | 1% |
| Sunday Night | 53°F | Mostly Clear | 3 mph E | 0% |
| Monday | 87°F | Sunny | 3 mph NE | 0% |
| Monday Night | 55°F | Mostly Clear | 2 mph SE | 0% |
| Tuesday | 86°F | Sunny | 1 to 6 mph NE | 7% |
| Tuesday Night | 54°F | Partly Cloudy | 1 to 6 mph SW | 7% |
| Wednesday | 80°F | Mostly Sunny | 1 to 7 mph N | 4% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 7 mph SE | 2% |
| Thursday | 78°F | Mostly Sunny | 0 to 3 mph N | 3% |
| Thursday Night | 50°F | Partly Cloudy | 0 to 3 mph S | 10% |
| Friday | 75°F | Mostly Sunny | 0 to 7 mph W | 12% |
| Friday Night | 48°F | Mostly Cloudy | 0 to 7 mph W | 12% |
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.