Sweetwater, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sweetwater, a community in Nez Perce County, Idaho.
Tonight
36°F
Mostly Cloudy
Mostly cloudy, with a low around 36. West wind around 1 mph.
7-day forecast for Sweetwater
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Mostly Cloudy | 1 mph W | 3% |
| Wednesday | 56°F | Sunny | 1 mph N | 1% |
| Wednesday Night | 38°F | Mostly Cloudy then Rain Showers Likely | 3 mph SE | 55% |
| Thursday | 55°F | Rain Showers Likely then Mostly Cloudy | 3 mph SW | 55% |
| Thursday Night | 34°F | Partly Cloudy | 2 to 6 mph SE | 2% |
| Friday | 58°F | Partly Sunny | 3 to 7 mph SE | 7% |
| Friday Night | 38°F | Mostly Cloudy | 3 to 8 mph SE | 7% |
| Saturday | 65°F | Partly Sunny | 3 to 7 mph SE | 2% |
| Saturday Night | 40°F | Mostly Cloudy | 3 to 16 mph SE | 7% |
| Sunday | 63°F | Mostly Cloudy | 2 to 8 mph S | 13% |
| Sunday Night | 38°F | Mostly Cloudy | 1 to 5 mph S | 12% |
| Monday | 60°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph E | 17% |
| Monday Night | 39°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 5 mph S | 17% |
| Tuesday | 63°F | Slight Chance Rain Showers | 5 mph SE | 22% |
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 Nov 4, 2026.