Sweetwater, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sweetwater, a community in Nez Perce County, Idaho.
Today
90°F
Haze
Haze and areas of smoke. Sunny, with a high near 90. North wind 1 to 5 mph.
7-day forecast for Sweetwater
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Haze | 1 to 5 mph N | 0% |
| Tonight | 54°F | Patchy Smoke | 1 to 5 mph E | 0% |
| Wednesday | 97°F | Areas Of Smoke | 1 to 6 mph N | 0% |
| Wednesday Night | 56°F | Areas Of Smoke then Clear | 2 to 6 mph E | 0% |
| Thursday | 103°F | Sunny | 5 mph NE | 0% |
| Thursday Night | 60°F | Clear | 5 mph S | 0% |
| Friday | 102°F | Sunny | 2 to 14 mph NW | 0% |
| Friday Night | 60°F | Clear | 0 to 14 mph SW | 0% |
| Saturday | 98°F | Sunny | 0 to 12 mph NW | 0% |
| Saturday Night | 59°F | Mostly Clear | 0 to 12 mph SW | 0% |
| Sunday | 93°F | Sunny | 0 to 10 mph NW | 0% |
| Sunday Night | 57°F | Mostly Clear | 0 to 10 mph S | 0% |
| Monday | 92°F | Sunny | 1 to 9 mph N | 0% |
| Monday Night | 56°F | Mostly Clear | 0 to 9 mph W | 0% |
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 Aug 4, 2026.