Hillsboro, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Washington County, Oregon.
Today
80°F
Patchy Fog then Mostly Sunny
Patchy fog before 8am. Mostly sunny, with a high near 80. North wind around 2 mph.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Patchy Fog then Mostly Sunny | 2 mph N | 0% |
| Tonight | 53°F | Mostly Clear | 2 mph NNW | 0% |
| Sunday | 83°F | Sunny | 0 to 6 mph N | 0% |
| Sunday Night | 54°F | Mostly Clear | 0 to 6 mph NNW | 0% |
| Monday | 78°F | Mostly Sunny | 0 to 6 mph N | 0% |
| Monday Night | 52°F | Partly Cloudy | 0 to 6 mph NNW | 0% |
| Tuesday | 74°F | Mostly Sunny | 0 to 5 mph N | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Wednesday | 73°F | Partly Sunny | 2 mph N | 0% |
| Wednesday Night | 52°F | Mostly Cloudy | 2 mph NNW | 2% |
| Thursday | 71°F | Partly Sunny | 0 to 6 mph N | 11% |
| Thursday Night | 51°F | Mostly Cloudy | 1 to 6 mph NNW | 11% |
| Friday | 69°F | Partly Sunny | 1 to 6 mph NNW | 9% |
| Friday Night | 50°F | Partly Cloudy | 1 to 6 mph NNW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Hillsboro (45.527, -122.935). Updated through the day.
Growing snapshot for Hillsboro
Last spring frost
Apr 16
First fall frost
Oct 23
Growing season
191 days
Hardiness zone
8b
More local growing data for Hillsboro: nearby ZIP 97124 weather · frost dates · planting calendar · Oregon frost dates
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Climate data from the nearest NOAA station, Portland-Hillsboro Ap, Or (2 mi from Hillsboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.