Seneca, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Seneca, a city in Grant County, Oregon.
Tonight
35°F
Mostly Clear
Mostly clear. Low around 35, with temperatures rising to around 39 overnight. Northwest wind around 1 mph.
7-day forecast for Seneca
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 35°F | Mostly Clear | 1 mph NW | 1% |
| Saturday | 74°F | Sunny | 0 to 5 mph N | 0% |
| Saturday Night | 37°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Sunday | 78°F | Sunny | 0 to 3 mph SE | 0% |
| Sunday Night | 38°F | Mostly Clear | 2 mph SE | 0% |
| Monday | 79°F | Sunny | 0 to 3 mph W | 0% |
| Monday Night | 39°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Tuesday | 79°F | Sunny | 0 to 6 mph W | 0% |
| Tuesday Night | 38°F | Mostly Clear | 0 to 6 mph NW | 0% |
| Wednesday | 77°F | Sunny | 0 to 7 mph SW | 1% |
| Wednesday Night | 37°F | Partly Cloudy | 0 to 7 mph N | 1% |
| Thursday | 78°F | Mostly Sunny | 0 to 8 mph S | 0% |
| Thursday Night | 37°F | Partly Cloudy | 0 to 7 mph NW | 2% |
| Friday | 72°F | Mostly Sunny | 0 to 9 mph SW | 7% |
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 Sep 19, 2026.