Hillsboro, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hillsboro, a city in Washington County, Oregon.
Overnight
38°F
Patchy Fog
Patchy fog after 2am. Mostly clear, with a low around 38. Wind around 0 mph.
7-day forecast for Hillsboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 38°F | Patchy Fog | 0 mph | 1% |
| Wednesday | 56°F | Areas Of Fog then Light Rain Likely | 2 mph SSE | 66% |
| Wednesday Night | 43°F | Light Rain then Areas Of Fog | 0 to 3 mph S | 86% |
| Thursday | 59°F | Areas Of Fog then Mostly Sunny | 1 mph W | 3% |
| Thursday Night | 41°F | Areas Of Fog | 0 mph | 28% |
| Friday | 57°F | Chance Light Rain | 1 mph SSE | 35% |
| Friday Night | 44°F | Chance Light Rain then Mostly Cloudy | 1 mph E | 32% |
| Saturday | 63°F | Partly Sunny then Chance Light Rain | 1 mph SSE | 25% |
| Saturday Night | 47°F | Light Rain | 1 to 10 mph S | 76% |
| Sunday | 58°F | Chance Light Rain | 0 to 3 mph SW | 35% |
| Sunday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 0 mph | 15% |
| Monday | 56°F | Chance Light Rain | 0 mph | 33% |
| Monday Night | 44°F | Chance Light Rain | 1 mph S | 40% |
| Tuesday | 58°F | Chance Light Rain | 1 mph S | 41% |
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 Nov 4, 2026.