Seneca, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Seneca, a city in Grant County, Oregon.
Overnight
37°F
Areas Of Smoke
Areas of smoke. Mostly clear. Low around 37, with temperatures rising to around 42 overnight. North wind around 2 mph.
7-day forecast for Seneca
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 37°F | Areas Of Smoke | 2 mph N | 0% |
| Tuesday | 84°F | Areas Of Smoke | 0 to 8 mph N | 0% |
| Tuesday Night | 43°F | Areas Of Smoke | 0 to 8 mph N | 0% |
| Wednesday | 93°F | Areas Of Smoke | 0 to 7 mph W | 0% |
| Wednesday Night | 48°F | Patchy Smoke then Mostly Clear | 0 to 7 mph N | 0% |
| Thursday | 98°F | Sunny | 0 to 7 mph W | 0% |
| Thursday Night | 51°F | Mostly Clear | 0 to 7 mph NW | 0% |
| Friday | 95°F | Sunny | 0 to 9 mph NW | 0% |
| Friday Night | 49°F | Mostly Clear | 1 to 9 mph NW | 0% |
| Saturday | 91°F | Sunny | 1 to 9 mph NW | 0% |
| Saturday Night | 47°F | Mostly Clear | 2 to 9 mph NW | 0% |
| Sunday | 86°F | Sunny | 2 to 9 mph NW | 0% |
| Sunday Night | 44°F | Mostly Clear | 2 to 9 mph NW | 0% |
| Monday | 85°F | Sunny | 1 to 9 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Seneca (44.135, -118.976). Updated through the day.
Growing snapshot for Seneca
Growing season
24 days
Hardiness zone
5b
More local growing data for Seneca: nearby ZIP 97873 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
Sumpter
Climate data from the nearest NOAA station, Seneca, Or (1.2 mi from Seneca). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.