Harper, OR Weather & Growing Conditions
Today
56°F
Sunny
Sunny, with a high near 56. West wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 56°F | Sunny | 6 mph W | 0% |
| Tonight | 40°F | Mostly Cloudy | 5 mph ENE | 1% |
| Thursday | 54°F | Partly Sunny | 6 mph NNE | 1% |
| Thursday Night | 34°F | Mostly Clear | 0 to 5 mph ENE | 0% |
| Friday | 51°F | Mostly Sunny | 0 to 5 mph ESE | 0% |
| Friday Night | 36°F | Partly Cloudy | 1 to 5 mph E | 0% |
| Saturday | 53°F | Mostly Sunny | 1 to 8 mph ESE | 0% |
| Saturday Night | 37°F | Partly Cloudy | 0 to 3 mph NNE | 0% |
| Sunday | 57°F | Partly Sunny | 0 to 5 mph NE | 0% |
| Sunday Night | 38°F | Mostly Cloudy | 2 mph N | 0% |
| Monday | 55°F | Partly Sunny | 2 mph ENE | 1% |
| Monday Night | 38°F | Mostly Cloudy | 2 mph NW | 10% |
| Tuesday | 57°F | Mostly Sunny | 0 to 3 mph ESE | 10% |
| Tuesday Night | 39°F | Partly Cloudy | 0 to 3 mph N | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harper, OR
Last spring frost
May 7
First fall frost
Oct 3
Growing season
147 days
Hardiness zone
6a
Explore more for Harper, OR: full frost dates · planting calendar · Oregon frost dates
Climate data from the nearest NOAA station, Westfall, Or (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.