Harper, OR Weather & Growing Conditions
Overnight
55°F
Areas Of Smoke
Areas of smoke. Mostly clear, with a low around 55. North northeast wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Areas Of Smoke | 9 mph NNE | 0% |
| Tuesday | 88°F | Areas Of Smoke | 2 to 8 mph E | 0% |
| Tuesday Night | 61°F | Areas Of Smoke | 2 to 9 mph ENE | 0% |
| Wednesday | 92°F | Smoke | 1 to 7 mph ESE | 0% |
| Wednesday Night | 66°F | Areas Of Smoke | 6 to 10 mph ENE | 0% |
| Thursday | 98°F | Areas Of Smoke | 2 to 7 mph ESE | 0% |
| Thursday Night | 66°F | Patchy Smoke | 5 to 13 mph E | 0% |
| Friday | 98°F | Sunny | 7 mph WNW | 0% |
| Friday Night | 68°F | Mostly Clear | 10 to 15 mph NW | 0% |
| Saturday | 96°F | Sunny | 3 to 9 mph WNW | 0% |
| Saturday Night | 66°F | Mostly Clear | 12 to 17 mph NW | 0% |
| Sunday | 92°F | Sunny | 5 to 10 mph NW | 0% |
| Sunday Night | 64°F | Mostly Clear | 15 mph NW | 0% |
| Monday | 91°F | Sunny | 5 to 10 mph NNW | 0% |
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 Aug 4, 2026.