Sumpter, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sumpter, a city in Grant County, Oregon.
Overnight
41°F
Areas Of Smoke
Areas of smoke. Mostly clear, with a low around 41. Wind around 0 mph.
7-day forecast for Sumpter
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Areas Of Smoke | 0 mph | 0% |
| Tuesday | 84°F | Areas Of Smoke | 0 to 3 mph NNE | 0% |
| Tuesday Night | 45°F | Smoke | 2 mph NNW | 0% |
| Wednesday | 90°F | Smoke | 0 to 3 mph S | 0% |
| Wednesday Night | 53°F | Areas Of Smoke | 0 to 3 mph SSW | 0% |
| Thursday | 94°F | Patchy Smoke | 0 to 5 mph SW | 0% |
| Thursday Night | 55°F | Patchy Smoke | 0 to 5 mph WSW | 0% |
| Friday | 92°F | Sunny | 0 to 6 mph WNW | 0% |
| Friday Night | 54°F | Mostly Clear | 0 to 6 mph NNW | 0% |
| Saturday | 90°F | Sunny | 0 to 6 mph NW | 0% |
| Saturday Night | 52°F | Mostly Clear | 1 to 6 mph NW | 0% |
| Sunday | 85°F | Sunny | 1 to 6 mph WNW | 0% |
| Sunday Night | 49°F | Mostly Clear | 0 to 6 mph NW | 0% |
| Monday | 85°F | Sunny | 0 to 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Sumpter (44.744, -118.197). Updated through the day.
Growing snapshot for Sumpter
Growing season
74 days
Hardiness zone
6b
More local growing data for Sumpter: nearby ZIP 97877 weather · frost dates · planting calendar · Oregon frost dates
Nearby towns & communities
Canyon City
Dayville
Granite
Greenhorn
John Day
Long Creek
Monument
Mount Vernon
Prairie City
Seneca
Climate data from the nearest NOAA station, Austin 3 S, Or (17 mi from Sumpter). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.