Harman US

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

WhenTempForecastWindPrecip
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

All Idaho locations ›

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.