Bethany, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bethany, a community in Washington County, Oregon.
This Afternoon
71°F
Sunny
Sunny, with a high near 71. North northeast wind around 1 mph.
7-day forecast for Bethany
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Sunny | 1 mph NNE | 0% |
| Tonight | 53°F | Mostly Clear | 2 mph N | 0% |
| Saturday | 79°F | Patchy Fog then Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 54°F | Partly Cloudy | 3 mph N | 0% |
| Sunday | 82°F | Sunny | 5 mph NNW | 0% |
| Sunday Night | 54°F | Mostly Clear | 1 to 5 mph NNW | 0% |
| Monday | 77°F | Mostly Sunny | 1 to 6 mph NNW | 0% |
| Monday Night | 54°F | Partly Cloudy | 1 to 6 mph NNW | 0% |
| Tuesday | 73°F | Mostly Sunny | 1 to 5 mph NNW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 1 to 5 mph NNW | 0% |
| Wednesday | 72°F | Mostly Sunny | 2 mph N | 0% |
| Wednesday Night | 53°F | Partly Cloudy | 2 mph N | 2% |
| Thursday | 75°F | Mostly Sunny | 2 mph NNW | 7% |
| Thursday Night | 54°F | Slight Chance Light Rain | 2 mph NW | 21% |
Forecast source: National Weather Service (api.weather.gov) for Bethany (45.561, -122.837). Updated through the day.
Growing snapshot for Bethany
Last spring frost
Feb 11
First fall frost
Dec 5
Growing season
303 days
Hardiness zone
8b
More local growing data for Bethany: nearby ZIP 97229 weather · frost dates · planting calendar · Oregon frost dates
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Climate data from the nearest NOAA station, Nature Park-Beaverton, Or (3.8 mi from Bethany). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.