Seneca, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Seneca, a city in Grant County, Oregon.
This Afternoon
67°F
Sunny
Sunny. High near 67, with temperatures falling to around 65 in the afternoon. Northwest wind around 8 mph.
7-day forecast for Seneca
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Sunny | 8 mph NW | 4% |
| Tonight | 35°F | Mostly Clear | 0 to 7 mph NW | 4% |
| Saturday | 74°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 38°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Sunday | 79°F | Sunny | 0 to 5 mph SE | 0% |
| Sunday Night | 40°F | Mostly Clear | 0 to 3 mph SE | 0% |
| Monday | 79°F | Sunny | 0 to 5 mph NW | 0% |
| Monday Night | 40°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Tuesday | 78°F | Sunny | 0 to 6 mph W | 1% |
| Tuesday Night | 39°F | Partly Cloudy | 1 to 6 mph N | 1% |
| Wednesday | 77°F | Sunny | 1 to 7 mph W | 0% |
| Wednesday Night | 39°F | Mostly Clear | 1 to 6 mph NE | 0% |
| Thursday | 81°F | Sunny | 1 to 10 mph SE | 1% |
| Thursday Night | 41°F | Partly Cloudy | 2 to 8 mph S | 2% |
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.