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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

WhenTempForecastWindPrecip
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

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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.